Pub Date : 2024-10-17DOI: 10.1016/j.solidstatesciences.2024.107722
Oksana Zaremba, Mariia-Suzanna Teplinska, Pavlo Demchenko, Vasyl Kordan, Roman Gladyshevskii
The phase diagram of the BaO(BaCO3)–Lu2O3–CuO system was built at 900 °C. It comprises of 8 single-phase, 15 two-phase, and 8 three-phase regions. The boundary oxide systems Lu2O3–CuO and BaO–CuO contain the phases Lu2Cu2O5 (structure type Ho2Cu2O5, Pearson symbol oP36, space group Pna21, a = 10.702(1), b = 3.412(1), c = 12.360(1) Å, RB = 0.076) and Ba44Cu45O90 (own structure type, cI400, Im-3m, a = 18.294(3) Å, RB = 0.114), whereas in the Lu2O3–BaO(BaCO3) system the oxide-carbonate Ba3Lu2[CO3]O5 (Ba3Yb2[CO3]O5, tP26, P4/mmm, a = 4.322(1), c = 11.862(2) Å, RB = 0.107) was identified under the conditions of the experiment. Two quaternary oxides were observed. The structure of BaLu2CuO5 was confirmed (BaY2CuO5, oP36, Pnma), whereas the structure of the phase with approximate composition Ba3LuCu2O6.5 still needs to be established. The electrochemical properties of BaLu2CuO5 as cathode material in Li-ion batteries were investigated. The existence of a (in part) substitutional solid solution BaLu2CuO5:Li was confirmed by the decrease of the unit-cell volume (−0.11 %). No traces of the formation of a phase with YBCO-type structure were detected at 900 °C.
{"title":"More about the BaO(BaCO3)–Lu2O3–CuO system","authors":"Oksana Zaremba, Mariia-Suzanna Teplinska, Pavlo Demchenko, Vasyl Kordan, Roman Gladyshevskii","doi":"10.1016/j.solidstatesciences.2024.107722","DOIUrl":"10.1016/j.solidstatesciences.2024.107722","url":null,"abstract":"<div><div>The phase diagram of the BaO(BaCO<sub>3</sub>)–Lu<sub>2</sub>O<sub>3</sub>–CuO system was built at 900 °C. It comprises of 8 single-phase, 15 two-phase, and 8 three-phase regions. The boundary oxide systems Lu<sub>2</sub>O<sub>3</sub>–CuO and BaO–CuO contain the phases Lu<sub>2</sub>Cu<sub>2</sub>O<sub>5</sub> (structure type Ho<sub>2</sub>Cu<sub>2</sub>O<sub>5</sub>, Pearson symbol <em>oP</em>36, space group <em>Pna</em>2<sub>1</sub>, <em>a</em> = 10.702(1), <em>b</em> = 3.412(1), <em>c</em> = 12.360(1) Å, <em>R</em><sub>B</sub> = 0.076) and Ba<sub>44</sub>Cu<sub>45</sub>O<sub>90</sub> (own structure type, <em>cI</em>400, <em>Im</em>-3<em>m</em>, <em>a</em> = 18.294(3) Å, <em>R</em><sub>B</sub> = 0.114), whereas in the Lu<sub>2</sub>O<sub>3</sub>–BaO(BaCO<sub>3</sub>) system the oxide-carbonate Ba<sub>3</sub>Lu<sub>2</sub>[CO<sub>3</sub>]O<sub>5</sub> (Ba<sub>3</sub>Yb<sub>2</sub>[CO<sub>3</sub>]O<sub>5</sub>, <em>tP</em>26, <em>P</em>4/<em>mmm</em>, <em>a</em> = 4.322(1), <em>c</em> = 11.862(2) Å, <em>R</em><sub>B</sub> = 0.107) was identified under the conditions of the experiment. Two quaternary oxides were observed. The structure of BaLu<sub>2</sub>CuO<sub>5</sub> was confirmed (BaY<sub>2</sub>CuO<sub>5</sub>, <em>oP</em>36, <em>Pnma</em>), whereas the structure of the phase with approximate composition Ba<sub>3</sub>LuCu<sub>2</sub>O<sub>6.5</sub> still needs to be established. The electrochemical properties of BaLu<sub>2</sub>CuO<sub>5</sub> as cathode material in Li-ion batteries were investigated. The existence of a (in part) substitutional solid solution BaLu<sub>2</sub>CuO<sub>5</sub>:Li was confirmed by the decrease of the unit-cell volume (−0.11 %). No traces of the formation of a phase with YBCO-type structure were detected at 900 °C.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107722"},"PeriodicalIF":3.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-17DOI: 10.1016/j.solidstatesciences.2024.107725
Victoria G. Grossman , Maxim S. Molokeev , Bair G. Bazarov
The traditional solid-state synthesizing method was employed to prepare Tl5-xKxLuZr(MoO4)6 (x = 0; 0.1; 0.2; 1; 2) ceramics. Structural characterization was performed through the Rietveld method on the X-ray powder diffraction data. The unit cell parameters are defined for Tl5-xKxLuZr(MoO4)6 (x = 0; 0.1; 0.2; 1; 2). Impedance spectra were measured at temperatures ranging from 300 to 800 K, covering a frequency range of 1 Hz to 1 MHz. The results show that the electrical conductivity decreases with an incrementing in the x value in the range of x = 0.1–2.0. Tl4.9K0.1LuZr(MoO4)6 has the best ionic conductivity of this series of molybdates (1.31 × 10−3 S cm−1), and Tl5LuZr(MoO4)6 has the lowest conductivity (5.51 × 10−4 S cm−1). Activation energy was found out to decrease from 1.32 eV for Tl5LuZr(MoO4)6 to 0.92 eV for Tl4.9K0.1LuZr(MoO4)6.
采用传统固态合成法制备了 Tl5-xKxLuZr(MoO4)6 (x = 0; 0.1; 0.2; 1; 2) 陶瓷。通过对 X 射线粉末衍射数据的里特维尔德法进行了结构表征。确定了 Tl5-xKxLuZr(MoO4)6 (x = 0; 0.1; 0.2; 1; 2) 的单胞参数。在 300 至 800 K 的温度范围内测量了阻抗谱，频率范围为 1 Hz 至 1 MHz。结果表明，在 x = 0.1-2.0 的范围内，电导率随着 x 值的增加而降低。在这一系列钼酸盐中，Tl4.9K0.1LuZr(MoO4)6 的离子导电率最好（1.31 × 10-3 S cm-1），而 Tl5LuZr(MoO4)6 的导电率最低（5.51 × 10-4 S cm-1）。活化能从 Tl5LuZr(MoO4)6 的 1.32 eV 下降到 Tl4.9K0.1LuZr(MoO4)6 的 0.92 eV。
{"title":"Synthesis and investigation of the structure, thermal and electrical properties of new Tl5-xKxLuZr(MoO4)6 (x = 0; 0.1; 0.2; 1; 2) molybdates","authors":"Victoria G. Grossman , Maxim S. Molokeev , Bair G. Bazarov","doi":"10.1016/j.solidstatesciences.2024.107725","DOIUrl":"10.1016/j.solidstatesciences.2024.107725","url":null,"abstract":"<div><div>The traditional solid-state synthesizing method was employed to prepare Tl<sub>5-<em>x</em></sub>K<sub><em>x</em></sub>LuZr(MoO<sub>4</sub>)<sub>6</sub> (<em>x</em> = 0; 0.1; 0.2; 1; 2) ceramics. Structural characterization was performed through the Rietveld method on the X-ray powder diffraction data. The unit cell parameters are defined for Tl<sub>5-<em>x</em></sub>K<sub><em>x</em></sub>LuZr(MoO<sub>4</sub>)<sub>6</sub> (<em>x</em> = 0; 0.1; 0.2; 1; 2). Impedance spectra were measured at temperatures ranging from 300 to 800 K, covering a frequency range of 1 Hz to 1 MHz. The results show that the electrical conductivity decreases with an incrementing in the <em>x</em> value in the range of <em>x</em> = 0.1–2.0. Tl<sub>4.9</sub>K<sub>0.1</sub>LuZr(MoO<sub>4</sub>)<sub>6</sub> has the best ionic conductivity of this series of molybdates (1.31 × 10<sup>−3</sup> S cm<sup>−1</sup><sub>)</sub>, and Tl<sub>5</sub>LuZr(MoO<sub>4</sub>)<sub>6</sub> has the lowest conductivity (5.51 × 10<sup>−4</sup> S cm<sup>−1</sup><sub>)</sub>. Activation energy was found out to decrease from 1.32 eV for Tl<sub>5</sub>LuZr(MoO<sub>4</sub>)<sub>6</sub> to 0.92 eV for Tl<sub>4.9</sub>K<sub>0.1</sub>LuZr(MoO<sub>4</sub>)<sub>6.</sub></div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107725"},"PeriodicalIF":3.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-16DOI: 10.1016/j.solidstatesciences.2024.107723
Burak Ay , Rina Takano , Takayuki Ishida
Four novel mononuclear lanthanide complexes, [Ln(TPymT)(NO3)3(H2O)2] (Ln: Eu3+ (1), Gd3+ (2), Tb3+ (3) and Dy3+ (4)), have been solvothermally synthesized using multidentate 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine (TPymT). Compounds 1–3 have been characterized by means of elemental analysis, FT-IR, and single-crystal/powder X-ray diffraction analysis. Compound 4 was structurally characterized. The Ln3+ ion in 1–4 is ten-coordinated, where TPymT serves as an N3 donor in an isostructural series. The alternating-current magnetic studies showed frequency dependence below ca. 10 K for 3, as an indication of a single-ion magnet. The activation energy for the magnetization reorientation was estimated as Ueff/kB = 95(9) K after applying a dc bias field 2000 Oe for 3. The photoluminescent studies clarified that 1 and 3 behaved as red and green light emitters with quantum yields as high as 17 and 39 %, respectively. The TD-DFT calculation supports the energy level scheme of ground and excited states of TPymT together with the reference compound 4′-phenyl-2,2’:6′,2″-terpyridine. The present work suggests a broad chance and motivation to apply TPymT to the field of 4f coordination chemistry.
{"title":"First TPymT-Ln complexes (TPymT = 2,4,6-Tris(2-pyrimidyl)-1,3,5-triazine; Ln = Eu, Gd, Tb, Dy): Solvothermal synthesis, structure, magnetic and photoluminescent properties","authors":"Burak Ay , Rina Takano , Takayuki Ishida","doi":"10.1016/j.solidstatesciences.2024.107723","DOIUrl":"10.1016/j.solidstatesciences.2024.107723","url":null,"abstract":"<div><div>Four novel mononuclear lanthanide complexes, [Ln(<strong>TPymT</strong>)(NO<sub>3</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>] (Ln: Eu<sup>3+</sup> (<strong>1</strong>), Gd<sup>3+</sup> (<strong>2</strong>), Tb<sup>3+</sup> (<strong>3</strong>) and Dy<sup>3+</sup> (<strong>4</strong>)), have been solvothermally synthesized using multidentate 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine (<strong>TPymT</strong>). Compounds <strong>1</strong>–<strong>3</strong> have been characterized by means of elemental analysis, FT-IR, and single-crystal/powder X-ray diffraction analysis. Compound <strong>4</strong> was structurally characterized. The Ln<sup>3+</sup> ion in <strong>1</strong>–<strong>4</strong> is ten-coordinated, where <strong>TPymT</strong> serves as an N<sub>3</sub> donor in an isostructural series. The alternating-current magnetic studies showed frequency dependence below ca. 10 K for <strong>3</strong>, as an indication of a single-ion magnet. The activation energy for the magnetization reorientation was estimated as <em>U</em><sub>eff</sub>/<em>k</em><sub>B</sub> = 95(9) K after applying a dc bias field 2000 Oe for <strong>3</strong>. The photoluminescent studies clarified that <strong>1</strong> and <strong>3</strong> behaved as red and green light emitters with quantum yields as high as 17 and 39 %, respectively. The TD-DFT calculation supports the energy level scheme of ground and excited states of <strong>TPymT</strong> together with the reference compound 4′-phenyl-2,2’:6′,2″-terpyridine. The present work suggests a broad chance and motivation to apply <strong>TPymT</strong> to the field of 4f coordination chemistry.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107723"},"PeriodicalIF":3.4,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.solidstatesciences.2024.107721
Klinton Brito K , Shobana Priyanka D , Srinivasan M , Sudharsan J B , Fujiwara K , Ramasamy P
In this article, we comprehensively reviewed the thermoelectric proper-ties of skutterudites-based materials. We discussed the various synthesis methods like non-chemical and chemical methods for the synthesis of the skutterudites materials for thermoelectric applications. In particular, this review articles also consolidates the information on how the filler plays a crucial role in improving the thermoelectric performance of the skutterudites materials. In addition, this review also concentrates on diverse fabrication methods employed in the production of skutterudites to optimize their thermoelectric performance. It also elucidates the efficiency of devices based on skutterudite materials and discusses the applications of thermoelectric devices.
{"title":"Skutterudites as sustainable thermoelectric material- A critical review","authors":"Klinton Brito K , Shobana Priyanka D , Srinivasan M , Sudharsan J B , Fujiwara K , Ramasamy P","doi":"10.1016/j.solidstatesciences.2024.107721","DOIUrl":"10.1016/j.solidstatesciences.2024.107721","url":null,"abstract":"<div><div>In this article, we comprehensively reviewed the thermoelectric proper-ties of skutterudites-based materials. We discussed the various synthesis methods like non-chemical and chemical methods for the synthesis of the skutterudites materials for thermoelectric applications. In particular, this review articles also consolidates the information on how the filler plays a crucial role in improving the thermoelectric performance of the skutterudites materials. In addition, this review also concentrates on diverse fabrication methods employed in the production of skutterudites to optimize their thermoelectric performance. It also elucidates the efficiency of devices based on skutterudite materials and discusses the applications of thermoelectric devices.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107721"},"PeriodicalIF":3.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.solidstatesciences.2024.107720
Jerzy Goraus , Wojciech Gumulak , Jacek Czerniewski , Marcin Fijałkowski , Jerzy Kubacki , Ondrej Zivotsky
Ti2MnAl was believed to be Spin Gapless Semiconducting (SGS) material, but this state can be achieved only in an inverted variant of Heusler structure. This specific structure is not realized under normal conditions, however, earlier reports suggest that substituting Al by In or Sn should make it possible. This was the motivation for studying the structural and physical properties of Ti2MnAl0.5In0.5 alloy in this paper. We also studied isoelectronic Ti2Fe0.5Cr0.5Al material, as it is well known that properties of Heusler compounds strongly depend on the valence electron count. We report a combined experimental and theoretical study, where we synthesized substituted variants and measured their diffraction patterns. Additionally we performed ab initio calculations using several methods to study the stability of the resulting compounds. We also examined the impact of disorder within Coherent Potential Approximation. Experimental XPS (X-ray Photoemission Spectroscopy) spectra, magnetic susceptibility and electrical resistivity are also discussed.
人们认为 Ti2MnAl 是无自旋间隙半导体（SGS）材料，但这种状态只有在 Heusler 结构的倒置变体中才能实现。这种特殊结构在正常条件下无法实现，然而，早先的报告表明，用 In 或 Sn 替代 Al 应该可以实现。这就是本文研究 Ti2MnAl0.5In0.5 合金的结构和物理性质的动机。我们还研究了等电子的 Ti2Fe0.5Cr0.5Al 材料，因为众所周知，Heusler 化合物的性质与价电子数密切相关。我们报告了一项实验和理论相结合的研究，我们合成了取代变体，并测量了它们的衍射图样。此外，我们还使用多种方法进行了 ab initio 计算，以研究由此产生的化合物的稳定性。我们还研究了相干势近似法中无序的影响。此外，我们还讨论了实验 XPS（X 射线光发射光谱）光谱、磁感应强度和电阻率。
{"title":"Structure and physical properties of modified Ti2MnAl compound – Ti2Fe0.5Cr0.5Al and Ti2MnAl0.5In0.5 case","authors":"Jerzy Goraus , Wojciech Gumulak , Jacek Czerniewski , Marcin Fijałkowski , Jerzy Kubacki , Ondrej Zivotsky","doi":"10.1016/j.solidstatesciences.2024.107720","DOIUrl":"10.1016/j.solidstatesciences.2024.107720","url":null,"abstract":"<div><div>Ti<sub>2</sub>MnAl was believed to be Spin Gapless Semiconducting (SGS) material, but this state can be achieved only in an inverted variant of Heusler structure. This specific structure is not realized under normal conditions, however, earlier reports suggest that substituting Al by In or Sn should make it possible. This was the motivation for studying the structural and physical properties of Ti<sub>2</sub>MnAl<sub>0.5</sub>In<sub>0.5</sub> alloy in this paper. We also studied isoelectronic Ti<sub>2</sub>Fe<sub>0.5</sub>Cr<sub>0.5</sub>Al material, as it is well known that properties of Heusler compounds strongly depend on the valence electron count. We report a combined experimental and theoretical study, where we synthesized substituted variants and measured their diffraction patterns. Additionally we performed ab initio calculations using several methods to study the stability of the resulting compounds. We also examined the impact of disorder within Coherent Potential Approximation. Experimental XPS (X-ray Photoemission Spectroscopy) spectra, magnetic susceptibility and electrical resistivity are also discussed.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107720"},"PeriodicalIF":3.4,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid-state ionic method has attracted more and more attention due to its simple operation and controllable preparation, but its growth mechanism is still uncertain. In this work, Ag nanowire (Ag NW) arrays prepared by solid-state ionics method at 5 μA impressed currents using fast ionic conductor RbAg4I5 films and different metal electrodes were reported. The conduction mode of Ag+ in RbAg4I5 films, the growth mechanism of Ag NW arrays prepared by solid-state ionics method and the effect of microscopic morphology on surface-enhance Raman scattering (SERS) performance were investigated. The results show that Ag nanoparticles (Ag NPs) with diameters from 40 nm to 70 nm were attached to the surface of Ag NW arrays with diameters of 80–150 nm prepared with different metal electrodes, which lead to Ag NW arrays have high surface roughness. The conduction velocity and stability of Ag+ in RbAg4I5 films are closely related to the morphology of Ag NW arrays. The irregular electrode interface and apical growth advantage resulted in the fractal dimension of Ag NW arrays prepared with Ag electrodes is 1.69 due to macroscopic dendritic structure. Ag NW arrays have excellent SERS performance due to the many Ag NPs attached to the surface of the closely aligned Ag NWs, the limit of detection (LOD) for Basic Fuchsin (BF) and Crystal Violet (CV) detected by Ag NW arrays SERS substrates prepared with Ag electrodes are as low as 10−11and 10−14mol/L, respectively. This paper provides a reference for the preparation method of metal nanostructures, Ag NW arrays have good potential for application in the field of trace analysis.
固态离子法因其操作简单、制备过程可控而受到越来越多的关注，但其生长机理仍不确定。本研究采用固态离子法，利用快速离子导体 RbAg4I5 薄膜和不同的金属电极，在 5 μA 冲击电流下制备了 Ag 纳米线（Ag NW）阵列。研究了 Ag+ 在 RbAg4I5 薄膜中的传导模式、固态离子法制备的 Ag NW 阵列的生长机制以及微观形貌对表面增强拉曼散射（SERS）性能的影响。结果表明，不同金属电极制备的直径为 80-150 nm 的 Ag NW 阵列表面附着有直径为 40 nm 至 70 nm 的 Ag NPs，导致 Ag NW 阵列具有较高的表面粗糙度。RbAg4I5 薄膜中 Ag+ 的传导速度和稳定性与 Ag NW 阵列的形态密切相关。由于不规则的电极界面和顶端生长优势，使用银电极制备的 Ag NW 阵列具有宏观树枝状结构，分形维数为 1.69。由于紧密排列的 Ag NW 表面附着了许多 Ag NPs，因此 Ag NW 阵列具有优异的 SERS 性能，用 Ag NW 阵列制备的 SERS 基底检测到的碱性品红（BF）和水晶紫（CV）的检测限（LOD）分别低至 10-11mol/L 和 10-14mol/L。本文为金属纳米结构的制备方法提供了参考，Ag NW 阵列在痕量分析领域具有良好的应用潜力。
{"title":"Growth mechanism and SERS effect of Ag nanowire arrays prepared by solid-state ionics method","authors":"Dapeng Xu, Yarui Liu, Song Zhang, Zixiong Wang, Wei Yang, Qiaoqin Guo, Jian Chen","doi":"10.1016/j.solidstatesciences.2024.107718","DOIUrl":"10.1016/j.solidstatesciences.2024.107718","url":null,"abstract":"<div><div>Solid-state ionic method has attracted more and more attention due to its simple operation and controllable preparation, but its growth mechanism is still uncertain. In this work, Ag nanowire (Ag NW) arrays prepared by solid-state ionics method at 5 μA impressed currents using fast ionic conductor RbAg<sub>4</sub>I<sub>5</sub> films and different metal electrodes were reported. The conduction mode of Ag<sup>+</sup> in RbAg<sub>4</sub>I<sub>5</sub> films, the growth mechanism of Ag NW arrays prepared by solid-state ionics method and the effect of microscopic morphology on surface-enhance Raman scattering (SERS) performance were investigated. The results show that Ag nanoparticles (Ag NPs) with diameters from 40 nm to 70 nm were attached to the surface of Ag NW arrays with diameters of 80–150 nm prepared with different metal electrodes, which lead to Ag NW arrays have high surface roughness. The conduction velocity and stability of Ag<sup>+</sup> in RbAg<sub>4</sub>I<sub>5</sub> films are closely related to the morphology of Ag NW arrays. The irregular electrode interface and apical growth advantage resulted in the fractal dimension of Ag NW arrays prepared with Ag electrodes is 1.69 due to macroscopic dendritic structure. Ag NW arrays have excellent SERS performance due to the many Ag NPs attached to the surface of the closely aligned Ag NWs, the limit of detection (LOD) for Basic Fuchsin (BF) and Crystal Violet (CV) detected by Ag NW arrays SERS substrates prepared with Ag electrodes are as low as 10<sup>−11</sup>and 10<sup>−14</sup>mol/L, respectively. This paper provides a reference for the preparation method of metal nanostructures, Ag NW arrays have good potential for application in the field of trace analysis.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107718"},"PeriodicalIF":3.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-09DOI: 10.1016/j.solidstatesciences.2024.107719
Glen R. Hebberd, Budhika G. Mendis, Leon Bowen, Stewart J. Clark, Emma E. McCabe
Oxychalcogenides containing transition metal or p block cations have potential for thermoelectric, photocatalytic and magnetic applications but the synthetic pathways to these quaternary phases are not fully understood. This presents a challenge to the design and preparation of new functional materials. Our combined experimental and computational study of La2O2MQ2 (M = +2 cation; Q = sulfide, selenide anion) systems explores the thermodynamic constraints on synthesis and highlights the subtle balance in stabilities of phases formed via competing reaction pathways.
含有过渡金属或 p 块阳离子的氧化钙苷具有热电、光催化和磁性应用的潜力，但这些四元相的合成途径还不完全清楚。这对设计和制备新型功能材料提出了挑战。我们对 La2O2MQ2（M = +2 阳离子；Q = 硫化物、硒化阴离子）系统进行了实验和计算相结合的研究，探索了合成的热力学限制，并强调了通过相互竞争的反应途径形成的相在稳定性方面的微妙平衡。
{"title":"La2O2MQ2 phases: Stability and synthetic challenges","authors":"Glen R. Hebberd, Budhika G. Mendis, Leon Bowen, Stewart J. Clark, Emma E. McCabe","doi":"10.1016/j.solidstatesciences.2024.107719","DOIUrl":"10.1016/j.solidstatesciences.2024.107719","url":null,"abstract":"<div><div>Oxychalcogenides containing transition metal or p block cations have potential for thermoelectric, photocatalytic and magnetic applications but the synthetic pathways to these quaternary phases are not fully understood. This presents a challenge to the design and preparation of new functional materials. Our combined experimental and computational study of La<sub>2</sub>O<sub>2</sub><em>MQ</em><sub>2</sub> (<em>M</em> = +2 cation; <em>Q</em> = sulfide, selenide anion) systems explores the thermodynamic constraints on synthesis and highlights the subtle balance in stabilities of phases formed via competing reaction pathways.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107719"},"PeriodicalIF":3.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-05DOI: 10.1016/j.solidstatesciences.2024.107717
Xiaoling Liu , Meng Wen , Qi Guo , Gang Wang , Pengcheng Hao , Wanyi Liu , Haijuan Zhan , Xiaoyan Chen , Heping Li
The development of photocatalysts with high charge separation and migration efficiencies for environmental remediation using sunlight had been a research priority. In this study, a ternary composite photocatalyst, P-CN/BC/NCDs, was successfully synthesized by thermal condensation and hydrothermal methods, incorporating graphitic carbon nitride (P-CN), biochar (BC), and nitrogen-doped carbon quantum dots (NCDs). Alizarin red S (ARS) was selected as the model pollutant to evaluate the photocatalytic degradation performance. P-CN/BC/NCDs exhibited enhanced photocatalytic degradation performance under visible light irradiation, with a 4.5-fold improvement compared to P-CN alone. The optimally NCDs-loaded P-CN/BC nanocomposites exhibited high visible light absorption and high specific surface area. The increased photocatalytic activity was further confirmed by the increase in photocurrent intensity and the decrease in fluorescence intensity and resistance. XPS and FT-IR tests showed that NCDs, as co-catalysts of P-CN/BC, effectively promoted charge separation through ether bonds and electrostatic interactions. It was experimentally verified by free radical trapping experiments and EPR tests that •O2− was the primary active species in the photocatalytic process, while •OH served as an auxiliary site during the degradation process. Cyclic experiments demonstrated high reusability and excellent stability, with an activity exceeding 93.8 %. Decomposition intermediates and reaction pathways were identified by liquid-quality analysis. Photocatalyst pervasiveness was evaluated by using different pollutants including methyl orange (MO), rhodamine B (Rh B) under similar conditions. This design concept of functional synergistic modification of P-CN materials holds promise for application in various fields.
{"title":"A novel metal-free nanomaterial P-CN/BC/NCDs preparation and its performance of photocatalytic degradation","authors":"Xiaoling Liu , Meng Wen , Qi Guo , Gang Wang , Pengcheng Hao , Wanyi Liu , Haijuan Zhan , Xiaoyan Chen , Heping Li","doi":"10.1016/j.solidstatesciences.2024.107717","DOIUrl":"10.1016/j.solidstatesciences.2024.107717","url":null,"abstract":"<div><div>The development of photocatalysts with high charge separation and migration efficiencies for environmental remediation using sunlight had been a research priority. In this study, a ternary composite photocatalyst, P-CN/BC/NCDs, was successfully synthesized by thermal condensation and hydrothermal methods, incorporating graphitic carbon nitride (P-CN), biochar (BC), and nitrogen-doped carbon quantum dots (NCDs). Alizarin red S (ARS) was selected as the model pollutant to evaluate the photocatalytic degradation performance. P-CN/BC/NCDs exhibited enhanced photocatalytic degradation performance under visible light irradiation, with a 4.5-fold improvement compared to P-CN alone. The optimally NCDs-loaded P-CN/BC nanocomposites exhibited high visible light absorption and high specific surface area. The increased photocatalytic activity was further confirmed by the increase in photocurrent intensity and the decrease in fluorescence intensity and resistance. XPS and FT-IR tests showed that NCDs, as co-catalysts of P-CN/BC, effectively promoted charge separation through ether bonds and electrostatic interactions. It was experimentally verified by free radical trapping experiments and EPR tests that •O<sub>2</sub><sup>−</sup> was the primary active species in the photocatalytic process, while •OH served as an auxiliary site during the degradation process. Cyclic experiments demonstrated high reusability and excellent stability, with an activity exceeding 93.8 %. Decomposition intermediates and reaction pathways were identified by liquid-quality analysis. Photocatalyst pervasiveness was evaluated by using different pollutants including methyl orange (MO), rhodamine B (Rh B) under similar conditions. This design concept of functional synergistic modification of P-CN materials holds promise for application in various fields.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107717"},"PeriodicalIF":3.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-05DOI: 10.1016/j.solidstatesciences.2024.107716
R. Li , J. Zhang , X.J. Zhou , X.T. Pang , X.X. Ji , J.F. Duan , X.Z. Lu , X.M. Chen , J.H. Li , D.W. Zhou
In this paper, the nitrogen doped (N-HPC), nitrogen and phosphorus co-doped hierarchical porous carbon (NP-HPC) are prepared by cross-linking phytic acid and poly pyrrole/aniline precursor, respectively. They are mixed with MgH2 by high-energy ball milling, and then their effects and mechanisms on the hydrogen absorption and desorption properties of MgH2 are investigated. Meanwhile, the hydrogen storage properties of MgH2 added with graphite (G) are also compared. The results show that the additions of NP-HPC, N-HPC, and G all exhibit the catalytic effect on the hydrogen absorption and desorption of MgH2. As for the hydrogen desorption, the catalytic effect is enhanced in the order of N-HPC, G and NP-HPC. Compared with pure MgH2, the hydrogen desorption temperature is reduced by 65.3 °C, 79.6 °C and 91.1 °C, respectively. Among them, the MgH2 + NP-HPC system can release 5.17 wt% hydrogen at 300 °C within 30 min. First-principles calculations reveal that the P-doped and vacancy-containing carbon materials significantly reduce the H2 recombination barrier from the surface of MgH2 and distort the atomic structure of near-surface layer of MgH2, which in turn weakens the Mg-H bond strength. This may be the intrinsic reason for the excellent catalytic effect of NP-HPC and vacancy-containing G on the hydrogen desorption performance of MgH2.
{"title":"Effects of heteroatom-doped hierarchical porous carbon on hydrogen storage properties of MgH2","authors":"R. Li , J. Zhang , X.J. Zhou , X.T. Pang , X.X. Ji , J.F. Duan , X.Z. Lu , X.M. Chen , J.H. Li , D.W. Zhou","doi":"10.1016/j.solidstatesciences.2024.107716","DOIUrl":"10.1016/j.solidstatesciences.2024.107716","url":null,"abstract":"<div><div>In this paper, the nitrogen doped (N-HPC), nitrogen and phosphorus co-doped hierarchical porous carbon (NP-HPC) are prepared by cross-linking phytic acid and poly pyrrole/aniline precursor, respectively. They are mixed with MgH<sub>2</sub> by high-energy ball milling, and then their effects and mechanisms on the hydrogen absorption and desorption properties of MgH<sub>2</sub> are investigated. Meanwhile, the hydrogen storage properties of MgH<sub>2</sub> added with graphite (G) are also compared. The results show that the additions of NP-HPC, N-HPC, and G all exhibit the catalytic effect on the hydrogen absorption and desorption of MgH<sub>2</sub>. As for the hydrogen desorption, the catalytic effect is enhanced in the order of N-HPC, G and NP-HPC. Compared with pure MgH<sub>2</sub>, the hydrogen desorption temperature is reduced by 65.3 °C, 79.6 °C and 91.1 °C, respectively. Among them, the MgH<sub>2</sub> + NP-HPC system can release 5.17 wt% hydrogen at 300 °C within 30 min. First-principles calculations reveal that the P-doped and vacancy-containing carbon materials significantly reduce the H<sub>2</sub> recombination barrier from the surface of MgH<sub>2</sub> and distort the atomic structure of near-surface layer of MgH<sub>2</sub>, which in turn weakens the Mg-H bond strength. This may be the intrinsic reason for the excellent catalytic effect of NP-HPC and vacancy-containing G on the hydrogen desorption performance of MgH<sub>2</sub>.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107716"},"PeriodicalIF":3.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.solidstatesciences.2024.107714
Sree Sesha Sudha Gayatri B, Madhusudhana Rao N
To examine the effect of rare earth ions on CuS nanostructures, a series of Gadolinium-doped copper sulphide (Cu1-xGdxS) nanostructures were synthesized through the hydrothermal method. These nanostructures were prepared at x = 0, 1, 3, 5, and 7 at. % concentrations. The prepared samples’ structural, optical, and magnetic characteristics were investigated. Powder X-ray diffraction and Raman analysis were performed to examine the structural analysis of the samples and confirm the existence of a covellite phase hexagonal structure. XPS analysis was conducted to study the valence states. Observations of the surface morphology study from FESEM reveal the formation of flower-shaped structures resembling nanospheres, while at lower magnification nanoflakes were observed. Optical reflectance spectra were recorded using UV–Vis spectroscopy, which showed the increase in bandgap as the concentration of Gd rises. The fluorescence spectrophotometer was utilized for the analysis of room-temperature photoluminescence. The prepared samples showed significant emission peaks at 435 nm. Fluorescence lifetime studies were carried out to confirm the fluorescence decay of CuS nanostructures doped with Gd. Magnetic measurements revealed that prepared samples exhibit an unexpected superparamagnetic nature at room temperature.
为了研究稀土离子对 CuS 纳米结构的影响，我们采用水热法合成了一系列掺杂钆的硫化铜（Cu1-xGdxS）纳米结构。这些纳米结构的 x = 0、1、3、5 和 7 的浓度分别为%的浓度下制备了这些纳米结构。研究了所制备样品的结构、光学和磁学特性。粉末 X 射线衍射和拉曼分析用于检查样品的结构分析，并确认了沸石相六方结构的存在。XPS 分析用于研究价态。通过 FESEM 对表面形貌的观察发现，形成了类似纳米球的花形结构，而在较低的放大倍率下则观察到了纳米片。使用紫外可见光谱仪记录的光学反射光谱显示，随着钆浓度的增加，带隙也在增加。荧光分光光度计用于分析室温光致发光。制备的样品在 435 纳米波长处显示出明显的发射峰。荧光寿命研究证实了掺杂钆的 CuS 纳米结构的荧光衰减。磁性测量显示，制备的样品在室温下具有意想不到的超顺磁性。
{"title":"Influence of gadolinium doping on structural, optical, and magnetic properties of CuS nanostructures","authors":"Sree Sesha Sudha Gayatri B, Madhusudhana Rao N","doi":"10.1016/j.solidstatesciences.2024.107714","DOIUrl":"10.1016/j.solidstatesciences.2024.107714","url":null,"abstract":"<div><div>To examine the effect of rare earth ions on CuS nanostructures, a series of Gadolinium-doped copper sulphide (Cu<sub>1-x</sub>Gd<sub>x</sub>S) nanostructures were synthesized through the hydrothermal method. These nanostructures were prepared at x = 0, 1, 3, 5, and 7 at. % concentrations. The prepared samples’ structural, optical, and magnetic characteristics were investigated. Powder X-ray diffraction and Raman analysis were performed to examine the structural analysis of the samples and confirm the existence of a covellite phase hexagonal structure. XPS analysis was conducted to study the valence states. Observations of the surface morphology study from FESEM reveal the formation of flower-shaped structures resembling nanospheres, while at lower magnification nanoflakes were observed. Optical reflectance spectra were recorded using UV–Vis spectroscopy, which showed the increase in bandgap as the concentration of Gd rises. The fluorescence spectrophotometer was utilized for the analysis of room-temperature photoluminescence. The prepared samples showed significant emission peaks at 435 nm. Fluorescence lifetime studies were carried out to confirm the fluorescence decay of CuS nanostructures doped with Gd. Magnetic measurements revealed that prepared samples exhibit an unexpected superparamagnetic nature at room temperature.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"157 ","pages":"Article 107714"},"PeriodicalIF":3.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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