Two‐dimensional Molybdenum diselenide is a versatile and promising material used for a wide range of applications and its synthesis in high quality and yield is currently the subject of intense research. Low temperature solution phase synthesis of nanomaterials using designed molecular precursors enjoys tremendous advantages over traditional high‐temperature solid‐state synthesis. However, molecular precursor chemistry of molybdenum selenide nanomaterials is almost non‐existent. We report here synthesis and structural characterization of new molybdenum molecular precursors with selenoether and selenourea ligands, which due to their easy synthesis, desired Mo/Se composition and moderate processing properties, are highly promising as single source precursors for the scale‐up production of 2D molybdenum diselenide materials. This is demonstrated by the solution‐phase decomposition of the Mo‐selenourea precursor which produced Mo‐rich MoSe2‐x ultrathin nanosheets (NSs) in good yield. These NSs were characterized by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP‐OES), Powder X‐ray diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FT‐IR), Thermogravimetric analysis (TGA), Transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS) studies.
二维二硒化钼是一种用途广泛、前景广阔的材料，高质量、高产量地合成二维二硒化钼是目前研究的热点。与传统的高温固态合成相比，利用设计的分子前驱体低温溶液相合成纳米材料具有巨大的优势。然而，硒化钼纳米材料的分子前驱体化学几乎不存在。我们在此报告了带有硒醚和硒脲配体的新型钼分子前驱体的合成和结构表征，由于它们易于合成、具有理想的钼/硒成分和适中的加工性能，因此极有希望作为单源前驱体用于二维二硒化钼材料的放大生产。通过对钼-硒脲前驱体进行溶液相分解，生产出了富钼的 MoSe2-x 超薄纳米片（NSs），并取得了良好的收率。通过电感耦合等离子体光学发射光谱 (ICP-OES)、粉末 X 射线衍射 (XRD)、拉曼光谱、傅立叶变换红外光谱 (FT-IR)、热重分析 (TGA)、透射电子显微镜 (TEM) 和 X 射线光电子能谱 (XPS) 研究对这些纳米片进行了表征。
{"title":"Single Source Precursor Path to 2D Materials: A Case Study of Solution‐Processed Molybdenum‐Rich MoSe2‐x Ultrathin Nanosheets","authors":"Shashank Mishra, Erwann Jeanneau, Sweta Gahlot, Nidal Raydan, Laurence Burel, Thibault Cornier, Anne Bonhomme, Pascal Bargiela","doi":"10.1002/cnma.202400357","DOIUrl":"https://doi.org/10.1002/cnma.202400357","url":null,"abstract":"Two‐dimensional Molybdenum diselenide is a versatile and promising material used for a wide range of applications and its synthesis in high quality and yield is currently the subject of intense research. Low temperature solution phase synthesis of nanomaterials using designed molecular precursors enjoys tremendous advantages over traditional high‐temperature solid‐state synthesis. However, molecular precursor chemistry of molybdenum selenide nanomaterials is almost non‐existent. We report here synthesis and structural characterization of new molybdenum molecular precursors with selenoether and selenourea ligands, which due to their easy synthesis, desired Mo/Se composition and moderate processing properties, are highly promising as single source precursors for the scale‐up production of 2D molybdenum diselenide materials. This is demonstrated by the solution‐phase decomposition of the Mo‐selenourea precursor which produced Mo‐rich MoSe2‐x ultrathin nanosheets (NSs) in good yield. These NSs were characterized by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP‐OES), Powder X‐ray diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FT‐IR), Thermogravimetric analysis (TGA), Transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS) studies.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Developing transition metal based overall water splitting (OWS) electrocatalysts with high efficiency, low‐cost, large current density, and long‐term stability is crucial for industrial electrolysis of water, but remains a major challenge. In this study, a hierarchical electrocatalyst with MoS2/Ni3S2 heterojunctions and a tiny amount of Au nanoparticles grown on nickel foam (MoS2/Ni3S2‐Au@NF) has been developed by a one‐step hydrothermal method. The heterojunctions and Au nanoparticle decoration induce the electron‐rich interfaces in the catalyst, which facilitate the synergistic adsorption of both OER and HER intermediates. As a result, MoS2/Ni3S2‐Au@NF possesses an excellent bifunctional electrocatalytic performance in 1M KOH with low HER overpotential (78 mV@10 mA cm−2, 253 mV@500 mA cm−2), low OER overpotential (261 mV@50 mA cm−2, 435 mV@500 mA cm−2), and outstanding cyclical stability and continuous stability, which are superior than typical benchmarks of Pt/C and RuO2. An electrolyzer assembled with the self‐supported MoS2/Ni3S2‐Au@NF electrode also displays excellent OWS activity and stability with a current density beyond 100 mA cm−2. This experiment is responding a potential alternative non‐precious metal electrocatalyst for OWS at industrial settings, and thus promotes the real‐word application of hydrogen energy conversions.
开发高效、低成本、大电流密度和长期稳定的过渡金属基整体水分离（OWS）电催化剂对于工业电解水至关重要，但仍是一项重大挑战。本研究采用一步水热法开发了一种在泡沫镍上生长有 MoS2/Ni3S2 异质结和微量金纳米粒子的分层电催化剂（MoS2/Ni3S2-Au@NF）。异质结和金纳米粒子装饰在催化剂中形成了富电子界面，从而促进了 OER 和 HER 中间产物的协同吸附。因此，MoS2/Ni3S2-Au@NF 在 1M KOH 中具有优异的双功能电催化性能，具有较低的 HER 过电位（78 mV@10 mA cm-2，253 mV@500 mA cm-2）、较低的 OER 过电位（261 mV@50 mA cm-2，435 mV@500 mA cm-2），以及出色的周期稳定性和连续稳定性，优于 Pt/C 和 RuO2 的典型基准。使用自支撑 MoS2/Ni3S2-Au@NF 电极组装的电解槽在电流密度超过 100 mA cm-2 时也显示出卓越的 OWS 活性和稳定性。该实验为工业环境下的 OWS 提供了一种潜在的非贵金属电催化剂替代品，从而促进了氢能转换的实际应用。
{"title":"Bifunctional electrocatalyst enhanced synergistically by MoS2/Ni3S2 heterojunctions and Au nanoparticles for large‐current‐density overall water splitting","authors":"Peizhi Liu, Dechuan Peng, Bin Zhang, Hao Bing, Yongqing Shen, Yanhui Song, Haojie Liang, Min Zhao, Haixia Zhang, Bingshe Xu, Junjie Guo","doi":"10.1002/cnma.202400430","DOIUrl":"https://doi.org/10.1002/cnma.202400430","url":null,"abstract":"Developing transition metal based overall water splitting (OWS) electrocatalysts with high efficiency, low‐cost, large current density, and long‐term stability is crucial for industrial electrolysis of water, but remains a major challenge. In this study, a hierarchical electrocatalyst with MoS2/Ni3S2 heterojunctions and a tiny amount of Au nanoparticles grown on nickel foam (MoS2/Ni3S2‐Au@NF) has been developed by a one‐step hydrothermal method. The heterojunctions and Au nanoparticle decoration induce the electron‐rich interfaces in the catalyst, which facilitate the synergistic adsorption of both OER and HER intermediates. As a result, MoS2/Ni3S2‐Au@NF possesses an excellent bifunctional electrocatalytic performance in 1M KOH with low HER overpotential (78 mV@10 mA cm−2, 253 mV@500 mA cm−2), low OER overpotential (261 mV@50 mA cm−2, 435 mV@500 mA cm−2), and outstanding cyclical stability and continuous stability, which are superior than typical benchmarks of Pt/C and RuO2. An electrolyzer assembled with the self‐supported MoS2/Ni3S2‐Au@NF electrode also displays excellent OWS activity and stability with a current density beyond 100 mA cm−2. This experiment is responding a potential alternative non‐precious metal electrocatalyst for OWS at industrial settings, and thus promotes the real‐word application of hydrogen energy conversions.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ravuri Syamsai, Vaiyapuri Vijay, Senthil Kumar Easwaran, Navaneethan M
Tantalum carbide MXene (Ta4C3Tx) were synthesized via HF etching of the Al intermediate layer from the parental tantalum aluminium carbide MAX phase (Ta4AlC3). The structural and vibrational studies confirm the formation of MXene from the MAX phase without disturbing the hexagonal crystal structure. The synthesized samples were analysed using XRD to understand the phase structure. In and out of plane vibrational properties were examined by Raman spectrometer. XPS confirms the successful HF etching of Al in MXene phase and all other elemental configurations. HR‐SEM and HR‐TEM revile the exfoliated layered structure of the MXene and hexagon diffraction pattern of the tantalum carbide MXene sample with increased d‐spacing. The TGA analysis demonstrated the thermal stability of the as‐synthesized post measured compounds. The synthesized tantalum carbide MXene shows stable thermoelectric properties over six thermal cycles. The temperature dependent transport properties were measured from 303 K to 803 K. Ta4C3Tx MXene shows a maximum Seebeck coefficient of 13.8 µV/K and a power factor of 1.88 µW/mK2 with the low lattice thermal conductivity of 5.42 W/mK at 803 K. In this present investigation, Tantalum carbide MXene demonstrated a decent thermoelectric property with high thermal cycling stability.
通过高频蚀刻母体钽铝碳化物 MAX 相（Ta4AlC3）中的铝中间层，合成了碳化钽 MXene（Ta4C3Tx）。结构和振动研究证实，MXene 是在不破坏六方晶体结构的情况下从 MAX 相中形成的。利用 XRD 对合成样品进行了分析，以了解相结构。拉曼光谱仪检测了平面内外的振动特性。XPS 证实高频成功蚀刻了 MXene 相中的铝和所有其他元素构型。HR-SEM 和 HR-TEM 揭示了 MXene 的剥离层状结构，以及碳化钽 MXene 样品的六边形衍射图样，其 d 间距有所增加。TGA 分析表明了合成后测量化合物的热稳定性。合成的碳化钽 MXene 在六个热循环中显示出稳定的热电特性。Ta4C3Tx MXene 的最大塞贝克系数为 13.8 µV/K，功率因数为 1.88 µW/mK2，在 803 K 时的低晶格热导率为 5.42 W/mK。
{"title":"Evaluation of 2D Tantalum Carbide MXene for Room to Mid‐ temperature Thermoelectric Applications","authors":"Ravuri Syamsai, Vaiyapuri Vijay, Senthil Kumar Easwaran, Navaneethan M","doi":"10.1002/cnma.202400391","DOIUrl":"https://doi.org/10.1002/cnma.202400391","url":null,"abstract":"Tantalum carbide MXene (Ta4C3Tx) were synthesized via HF etching of the Al intermediate layer from the parental tantalum aluminium carbide MAX phase (Ta4AlC3). The structural and vibrational studies confirm the formation of MXene from the MAX phase without disturbing the hexagonal crystal structure. The synthesized samples were analysed using XRD to understand the phase structure. In and out of plane vibrational properties were examined by Raman spectrometer. XPS confirms the successful HF etching of Al in MXene phase and all other elemental configurations. HR‐SEM and HR‐TEM revile the exfoliated layered structure of the MXene and hexagon diffraction pattern of the tantalum carbide MXene sample with increased d‐spacing. The TGA analysis demonstrated the thermal stability of the as‐synthesized post measured compounds. The synthesized tantalum carbide MXene shows stable thermoelectric properties over six thermal cycles. The temperature dependent transport properties were measured from 303 K to 803 K. Ta4C3Tx MXene shows a maximum Seebeck coefficient of 13.8 µV/K and a power factor of 1.88 µW/mK2 with the low lattice thermal conductivity of 5.42 W/mK at 803 K. In this present investigation, Tantalum carbide MXene demonstrated a decent thermoelectric property with high thermal cycling stability.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recently, the electronic skin (E‐skin) based on triboelectric nanogenerators (TENGs) has exhibited enormous potential in smart sports. However, TENGs device installed on human body usually faces challenges in complex mechanical environments. Here, we proposed a flexible TPU/MXene/carbon conductive electrode and combined with PDMS to prepare triboelectric nanogenerator (PT‐TENG) to harvest mechanical energy. Moreover, to demonstrate the application of PT‐TENG in smart sports, we can use it to monitor the posture changes of human joints during Tai Chi exercise and heart rate. The transfer charge (Qsc) of PT‐TENG can arrive at 104.65 nC, which is superior to the output performance produced by using traditional metal aluminum foil to prepare TENG device. The PT‐TENG can obtain the maximum output power of 132.34 μW under the working frequency 2 Hz. The experimental results show that PT‐TENG installed on the fingers, wrists, and knees of the human body can effectively perceive the bending angle of joints, which is very meaningful for evaluating the posture of movements in Tai Chi training. This research provide an effective path to promote the application of the self‐powered E‐skin based on TENG device on the smart sport field.
{"title":"A Triboelectric Nanogenerator Based on TPU/MXene/Carbon for Heart Rate and Tai Chi Posture Monitoring","authors":"Zhongxing Zhang, Jun Cai","doi":"10.1002/cnma.202300614","DOIUrl":"https://doi.org/10.1002/cnma.202300614","url":null,"abstract":"Recently, the electronic skin (E‐skin) based on triboelectric nanogenerators (TENGs) has exhibited enormous potential in smart sports. However, TENGs device installed on human body usually faces challenges in complex mechanical environments. Here, we proposed a flexible TPU/MXene/carbon conductive electrode and combined with PDMS to prepare triboelectric nanogenerator (PT‐TENG) to harvest mechanical energy. Moreover, to demonstrate the application of PT‐TENG in smart sports, we can use it to monitor the posture changes of human joints during Tai Chi exercise and heart rate. The transfer charge (<jats:italic>Q<jats:sub>sc</jats:sub></jats:italic>) of PT‐TENG can arrive at 104.65 nC, which is superior to the output performance produced by using traditional metal aluminum foil to prepare TENG device. The PT‐TENG can obtain the maximum output power of 132.34 μW under the working frequency 2 Hz. The experimental results show that PT‐TENG installed on the fingers, wrists, and knees of the human body can effectively perceive the bending angle of joints, which is very meaningful for evaluating the posture of movements in Tai Chi training. This research provide an effective path to promote the application of the self‐powered E‐skin based on TENG device on the smart sport field.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The quest for novel chromophoric materials with tunable properties to match the natural spectrum of skin tones lacks comprehensive solutions, particularly in harnessing natural proteins for pigment synthesis. This research delved into the synthesis of sub‐micron Keratin‐Cysteine particles inspired by natural pigment production pathways. Adjustment of the initial conditions of the water‐based reaction between keratin, tyrosinase and cysteine, yielded Keratin‐Cysteine particles with colors tunable within the light to intermediate skin tone range. A systematic investigation of the reaction conditions through factorial design of experiment (DOE) identified the sequence of addition of tyrosinase and cysteine as the key determinant of color tone. Ultraviolet‐visible (UV‐Vis) spectroscopy, attenuated total reflectance Fourier transform infrared (ATR‐FTIR) spectroscopy and color analysis were performed to elucidate the reaction mechanism. This research presents a promising approach to chromophore synthesis for cosmetic and biomedical applications.
{"title":"Chromophoric Keratin‐Cysteine Particle Synthesis Using Factorial Design of Experiment","authors":"Yaniv Damatov, Chen Nowogrodski, Oded Shoseyov","doi":"10.1002/cnma.202400273","DOIUrl":"https://doi.org/10.1002/cnma.202400273","url":null,"abstract":"The quest for novel chromophoric materials with tunable properties to match the natural spectrum of skin tones lacks comprehensive solutions, particularly in harnessing natural proteins for pigment synthesis. This research delved into the synthesis of sub‐micron Keratin‐Cysteine particles inspired by natural pigment production pathways. Adjustment of the initial conditions of the water‐based reaction between keratin, tyrosinase and cysteine, yielded Keratin‐Cysteine particles with colors tunable within the light to intermediate skin tone range. A systematic investigation of the reaction conditions through factorial design of experiment (DOE) identified the sequence of addition of tyrosinase and cysteine as the key determinant of color tone. Ultraviolet‐visible (UV‐Vis) spectroscopy, attenuated total reflectance Fourier transform infrared (ATR‐FTIR) spectroscopy and color analysis were performed to elucidate the reaction mechanism. This research presents a promising approach to chromophore synthesis for cosmetic and biomedical applications.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xue Qi, Hao Lv, Yuxin Wang, Yang Ye, Peike Wang, Ao Yin, Jingjing Luo, Haipeng Liu, Zhongqi Ren, Jiang Liu, Suzhu Yu, Jun Wei
Flexible sensors, being a vital component of flexible devices, determine the functionalities and performance capabilities of the devices., especially, are widely used in flexible sensors in past research due to their great advantages in flexibility and sensitivity. In this work ， silver nanowires with aspect ratios of 600, 1000, and 1400 were synthesized by adjusting the synergy of Br– and Cl–, along with other process parameters, leading to an improved production efficiency of silver nanowires. The stability of the conductive network is enhanced when the aspect ratio of silver nanowires is 1000 and 1400.The sensor demonstrated high sensitivity at high strain, along with an extended strain range. Moreover, it was observed that increasing the aspect ratio of silver nanowires led to a more stable conductive network, thus enhancing the sensor's stability with over 10000 stretching cycles. under the appropriate deposition density, silver nanowires with aspect ratio of 600 have high sensitivity to low strain, and silver nanowires with aspect ratio of 1400 have high sensitivity to high strain, up to 247.3. Introducing microstructures on the surface of PDMS resulted in an increased maximum sensitivity of the sensor with decreasing microstructure size, reaching a maximum sensitivity of 322.2.
{"title":"Synthesis of Ag nanowires with high aspect ratio for highly sensitive flexible strain sensor","authors":"Xue Qi, Hao Lv, Yuxin Wang, Yang Ye, Peike Wang, Ao Yin, Jingjing Luo, Haipeng Liu, Zhongqi Ren, Jiang Liu, Suzhu Yu, Jun Wei","doi":"10.1002/cnma.202400264","DOIUrl":"https://doi.org/10.1002/cnma.202400264","url":null,"abstract":"Flexible sensors, being a vital component of flexible devices, determine the functionalities and performance capabilities of the devices., especially, are widely used in flexible sensors in past research due to their great advantages in flexibility and sensitivity. In this work ， silver nanowires with aspect ratios of 600, 1000, and 1400 were synthesized by adjusting the synergy of Br– and Cl–, along with other process parameters, leading to an improved production efficiency of silver nanowires. The stability of the conductive network is enhanced when the aspect ratio of silver nanowires is 1000 and 1400.The sensor demonstrated high sensitivity at high strain, along with an extended strain range. Moreover, it was observed that increasing the aspect ratio of silver nanowires led to a more stable conductive network, thus enhancing the sensor's stability with over 10000 stretching cycles. under the appropriate deposition density, silver nanowires with aspect ratio of 600 have high sensitivity to low strain, and silver nanowires with aspect ratio of 1400 have high sensitivity to high strain, up to 247.3. Introducing microstructures on the surface of PDMS resulted in an increased maximum sensitivity of the sensor with decreasing microstructure size, reaching a maximum sensitivity of 322.2.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karabi Chatterjee, Anupam Gorai, Swarnali Hait, Subrata Maity, Moni Baskey Sen, Arpita Dutta, Riya Nag, Abhijit Bera, Sanjit Sarkar, Sudip K. Saha, Abu Jahid Akhtar
The exploration of semiconductor nanostructures utilizing mixed metal materials is an emerging area of study across fields including field-effect transistors, chemical sensors, photodetectors, photocatalysts, and many more. This study developed ZnFe2O4-based Schottky diodes to tune their electronic and optoelectronic characteristics through doping. Here, Ni doping facilitated the tuning of electronic properties, leading to significant increase in the rectification ratio from 238 to 1172, along with a reduction in the potential barrier height from 0.67 V to 0.65 V. This is attributed to Ni’s role as a charge carrier in ZFO, enhancing carrier concentration, confirmed by Mott–Schottky analysis. The 5 mol% Ni-doped ZFO also exhibited remarkable light sensitivity, with its rectification ratio surging to 1795 under illumination, four times that of the undoped version. Additionally, its photo-sensitivity soared to 42.46%, nearly quadrupling the undoped device’s performance, and its power gain impressively climbed to 38.4%, which is over twelvefold the undoped sample’s output. Furthermore, the diode responds strongly to optical illumination, making this structure suitable for use as a photodiode or photosensor. Apart from that by employing a doping strategy, we achieved 64.61% degradation of methylene blue dye under visible light in 120 minutes, compared to 36.85% for the undoped sample.
{"title":"Exploring the Impact of Ni Doping in Tuning the Bandgap, Electronic, Optoelectronic and Photocatalytic Properties of ZnFe2O4","authors":"Karabi Chatterjee, Anupam Gorai, Swarnali Hait, Subrata Maity, Moni Baskey Sen, Arpita Dutta, Riya Nag, Abhijit Bera, Sanjit Sarkar, Sudip K. Saha, Abu Jahid Akhtar","doi":"10.1002/cnma.202400348","DOIUrl":"https://doi.org/10.1002/cnma.202400348","url":null,"abstract":"The exploration of semiconductor nanostructures utilizing mixed metal materials is an emerging area of study across fields including field-effect transistors, chemical sensors, photodetectors, photocatalysts, and many more. This study developed ZnFe2O4-based Schottky diodes to tune their electronic and optoelectronic characteristics through doping. Here, Ni doping facilitated the tuning of electronic properties, leading to significant increase in the rectification ratio from 238 to 1172, along with a reduction in the potential barrier height from 0.67 V to 0.65 V. This is attributed to Ni’s role as a charge carrier in ZFO, enhancing carrier concentration, confirmed by Mott–Schottky analysis. The 5 mol% Ni-doped ZFO also exhibited remarkable light sensitivity, with its rectification ratio surging to 1795 under illumination, four times that of the undoped version. Additionally, its photo-sensitivity soared to 42.46%, nearly quadrupling the undoped device’s performance, and its power gain impressively climbed to 38.4%, which is over twelvefold the undoped sample’s output. Furthermore, the diode responds strongly to optical illumination, making this structure suitable for use as a photodiode or photosensor. Apart from that by employing a doping strategy, we achieved 64.61% degradation of methylene blue dye under visible light in 120 minutes, compared to 36.85% for the undoped sample.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The global issue of plastic waste accumulation is now widely acknowledged as a significant environmental challenge that affects all aspects of life, economies, and natural ecosystems worldwide. Hence, it is crucial to develop sustainable solutions to traditional disposal methods. One promising solution involves upcycling plastic waste into valuable carbon nanomaterials such as carbon nanotubes, graphene, and carbon nanofibers, among others. This critical review provides an overview of the problems associated with plastics, including their various types and properties, as well as their significant impact on the environment and the methods currently employed for waste management. Furthermore, it delves into recent advancements in upcycling plastic waste into carbon nanomaterials through four state‐of‐the‐art methods with the potential for scaling up and enabling industrial applications: thermal decomposition, flash joule heating (FJH), chemical vapor decomposition (CVD), and stepwise conversion. For each method, highly influential and seminal papers were selected, and their research approaches and observed results were thoroughly analysed. This upcycling approach transforms plastic waste into valuable resources, promoting a waste‐to‐value concept that reduces environmental impact and supports the circular economy. By creating new materials from discarded plastics, it addresses waste management challenges while generating economic value.
{"title":"Upcycling plastic waste into valuable carbon nanomaterials","authors":"Ling Chi, Muhammad Omar Shaikh","doi":"10.1002/cnma.202400409","DOIUrl":"https://doi.org/10.1002/cnma.202400409","url":null,"abstract":"The global issue of plastic waste accumulation is now widely acknowledged as a significant environmental challenge that affects all aspects of life, economies, and natural ecosystems worldwide. Hence, it is crucial to develop sustainable solutions to traditional disposal methods. One promising solution involves upcycling plastic waste into valuable carbon nanomaterials such as carbon nanotubes, graphene, and carbon nanofibers, among others. This critical review provides an overview of the problems associated with plastics, including their various types and properties, as well as their significant impact on the environment and the methods currently employed for waste management. Furthermore, it delves into recent advancements in upcycling plastic waste into carbon nanomaterials through four state‐of‐the‐art methods with the potential for scaling up and enabling industrial applications: thermal decomposition, flash joule heating (FJH), chemical vapor decomposition (CVD), and stepwise conversion. For each method, highly influential and seminal papers were selected, and their research approaches and observed results were thoroughly analysed. This upcycling approach transforms plastic waste into valuable resources, promoting a waste‐to‐value concept that reduces environmental impact and supports the circular economy. By creating new materials from discarded plastics, it addresses waste management challenges while generating economic value.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohd Jahir Khan, Ratanaporn Chaipanya, Sudarat Suksomboon, Janejira Sonyeam, Pattaraporn Posoknistakul, Boonya Charnnok, Pisut Pongchaikul, Navadol Laosiripojana, Kevin C.-W. Wu, Chularat Sakdaronnarong
Environmental hazards, especially particulates, and microbiological pollutants, have resulted in significant negative impacts on human health. In this study, 3D biodegradable cellulose filters were made from nanocellulose and tested for the removal efficiency of airborne particulates. Cellulose was first extracted from palm empty fruit bunches (EFBs) using green Deep Eutectic Solvents (DESs) under moderate temperature and then homogenized at high pressure to produce cellulose at the nanoscale size. Three types of renewable choline chloride (ChCl)-based DESs were used: lactic acid, 1,3-butanediol, and oxalic acid. The maximum cellulose yield from DES pretreatment was 38.78 % based on raw EFB (100 % cellulose yield based on cellulose in EFB) with ChBu60 C and the maximum nanocellulose yield was 68.49 % based on cellulose in EFB with ChLa80 C after 12-pass high pressure homogenization. The cellulose air filter was fabricated using tert-butyl alcohol (tBuOH) solvent exchanged under freeze-drying conditions and characterized by different state-of-the-art techniques. It was shown that the ChBu80 C filter had the lowest pressure drop (10.16 mmH2O or 2.07 mmH2O cm−2) and the maximum particle filtration efficiency (32.51 % for 0.1 μm and 93.63 % for 1.0 μm particles). The process simulation and techno-economic analysis were performed for nanocellulose production and air filter fabrication to select the most feasible technology.
{"title":"3D Porous Nanocellulose Based Filter from Palm Bunch Using Tert-Butyl Alcohol-Assisted Pore Inducive Technique for Airborne Particulate Matter Retention","authors":"Mohd Jahir Khan, Ratanaporn Chaipanya, Sudarat Suksomboon, Janejira Sonyeam, Pattaraporn Posoknistakul, Boonya Charnnok, Pisut Pongchaikul, Navadol Laosiripojana, Kevin C.-W. Wu, Chularat Sakdaronnarong","doi":"10.1002/cnma.202400129","DOIUrl":"https://doi.org/10.1002/cnma.202400129","url":null,"abstract":"Environmental hazards, especially particulates, and microbiological pollutants, have resulted in significant negative impacts on human health. In this study, 3D biodegradable cellulose filters were made from nanocellulose and tested for the removal efficiency of airborne particulates. Cellulose was first extracted from palm empty fruit bunches (EFBs) using green Deep Eutectic Solvents (DESs) under moderate temperature and then homogenized at high pressure to produce cellulose at the nanoscale size. Three types of renewable choline chloride (ChCl)-based DESs were used: lactic acid, 1,3-butanediol, and oxalic acid. The maximum cellulose yield from DES pretreatment was 38.78 % based on raw EFB (100 % cellulose yield based on cellulose in EFB) with ChBu60 C and the maximum nanocellulose yield was 68.49 % based on cellulose in EFB with ChLa80 C after 12-pass high pressure homogenization. The cellulose air filter was fabricated using tert-butyl alcohol (tBuOH) solvent exchanged under freeze-drying conditions and characterized by different state-of-the-art techniques. It was shown that the ChBu80 C filter had the lowest pressure drop (10.16 mmH<sub>2</sub>O or 2.07 mmH<sub>2</sub>O cm<sup>−2</sup>) and the maximum particle filtration efficiency (32.51 % for 0.1 μm and 93.63 % for 1.0 μm particles). The process simulation and techno-economic analysis were performed for nanocellulose production and air filter fabrication to select the most feasible technology.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Haibo Zeng, Shuai Yang, Danni Yan, Hong Zhu, Naiwei Wei, Yuhui Dong, Yousheng Zou
In recent years, Ag‐In‐Ga‐S (AIGS) quaternary quantum dots (QDs) have garnered significant attention as a novel class of environmentally friendly and non‐toxic QDs. However, the hydrothermal synthesis method for aqueous QDs has been plagued by issues such as inconsistent size, subpar crystallinity, and low photoluminescence quantum yield (PLQY). Herein, we developed a dual ligand strategy based on the hard and soft acids and bases (HSAB) theory to synthesize aqueous AIGS QDs with an impressive PLQY of up to 64.3%, currently the highest value among hydrothermal‐synthesized uncoated I‐III‐VI QDs. The QDs exhibit better crystallinity, narrow size distribution (3.07 ± 0.31 nm), and remarkable stability. The mechanism underlying this dual ligand strategy was further elucidated, shedding light on the distinct influences of different ligands on the growth of QDs. The high PLQY contributes to the further application of aqueous AIGS QDs in luminescent displays and the field of biology. Meanwhile, this ligand strategy has broad reference significance for efficient preparation of other water‐soluble QDs.
{"title":"Dual Ligand Strategy for Efficient and Stable Ag‐In‐Ga‐S Aqueous Quantum Dots","authors":"Haibo Zeng, Shuai Yang, Danni Yan, Hong Zhu, Naiwei Wei, Yuhui Dong, Yousheng Zou","doi":"10.1002/cnma.202400252","DOIUrl":"https://doi.org/10.1002/cnma.202400252","url":null,"abstract":"In recent years, Ag‐In‐Ga‐S (AIGS) quaternary quantum dots (QDs) have garnered significant attention as a novel class of environmentally friendly and non‐toxic QDs. However, the hydrothermal synthesis method for aqueous QDs has been plagued by issues such as inconsistent size, subpar crystallinity, and low photoluminescence quantum yield (PLQY). Herein, we developed a dual ligand strategy based on the hard and soft acids and bases (HSAB) theory to synthesize aqueous AIGS QDs with an impressive PLQY of up to 64.3%, currently the highest value among hydrothermal‐synthesized uncoated I‐III‐VI QDs. The QDs exhibit better crystallinity, narrow size distribution (3.07 ± 0.31 nm), and remarkable stability. The mechanism underlying this dual ligand strategy was further elucidated, shedding light on the distinct influences of different ligands on the growth of QDs. The high PLQY contributes to the further application of aqueous AIGS QDs in luminescent displays and the field of biology. Meanwhile, this ligand strategy has broad reference significance for efficient preparation of other water‐soluble QDs.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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