Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1249
Y. Yusof, M. D. Johan Ooi, N. Rammely
This study demonstrated a rapid method of producing PtPd via chemical reduction by varying metal composition and types of capping agents. The effect of different compositions between the two-metal precursor, Pt and Pd, is invested by tuning at various volume ratios of 3:1, 1:3, and 1:1 and comparing them with their single counterparts. The FESEM results show that all prepared samples exhibit nanosponges structure. PtPd of 1:1 ratio has the highest ECSA of 14.25 m2 /g, while PtPd with PVP exhibits a high ECSA value of 692.7 m2 /g compared to those without capping agent (287.8 m2 /g), indicating large active sites, which increases its catalytic function.
{"title":"Tuning the properties of PtPd nanoparticles by varying metal composition and capping agents","authors":"Y. Yusof, M. D. Johan Ooi, N. Rammely","doi":"10.15251/djnb.2023.184.1249","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1249","url":null,"abstract":"This study demonstrated a rapid method of producing PtPd via chemical reduction by varying metal composition and types of capping agents. The effect of different compositions between the two-metal precursor, Pt and Pd, is invested by tuning at various volume ratios of 3:1, 1:3, and 1:1 and comparing them with their single counterparts. The FESEM results show that all prepared samples exhibit nanosponges structure. PtPd of 1:1 ratio has the highest ECSA of 14.25 m2 /g, while PtPd with PVP exhibits a high ECSA value of 692.7 m2 /g compared to those without capping agent (287.8 m2 /g), indicating large active sites, which increases its catalytic function.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136133382","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}
Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1179
T. Xaba, P. M. Shumbula, S. Nyembe, P. Tetyana
A primary amine, salicylaldehyde and copper salt were combined to prepare the bis(Nbenzyl-salicydenaminato)copper (II) complex. The copper (II) complex was then used as a precursor to synthesize mixed phase morphological copper oxide nanoparticles via thermal decomposition method using trioctylphosphine oxide as a capping molecule at different temperatures of 120, 180, and 240 ºC. The XRD patterns of copper oxide nanoparticles synthesized at lower temperatures exhibit a mixture of monoclinic structure of CuO whereas the nanoparticles synthesized at higher temperature reveals the peaks that are attributed to mainly face-centered-cubic metallic Cu. The TEM images showed spherical particles that were increasing in sizes when the temperature was raised.
{"title":"Synthesis of mixed phase morphologies of copper oxide nanoparticles using bis(n-benzyl-salicydenaminato)copper(II) as a precursor","authors":"T. Xaba, P. M. Shumbula, S. Nyembe, P. Tetyana","doi":"10.15251/djnb.2023.184.1179","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1179","url":null,"abstract":"A primary amine, salicylaldehyde and copper salt were combined to prepare the bis(Nbenzyl-salicydenaminato)copper (II) complex. The copper (II) complex was then used as a precursor to synthesize mixed phase morphological copper oxide nanoparticles via thermal decomposition method using trioctylphosphine oxide as a capping molecule at different temperatures of 120, 180, and 240 ºC. The XRD patterns of copper oxide nanoparticles synthesized at lower temperatures exhibit a mixture of monoclinic structure of CuO whereas the nanoparticles synthesized at higher temperature reveals the peaks that are attributed to mainly face-centered-cubic metallic Cu. The TEM images showed spherical particles that were increasing in sizes when the temperature was raised.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136133384","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}
Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1187
A.K. Sameer, M.N. Jasim, M.T. Hussein
In the present work, the ternary compound MgxZn7-x O7Wurtzoid with variable Zn and Mg contents was analyzed using density functional theory with B3LYP 6-311G**basis set. The electronic and vibrational properties of MgxZn7-xO7 wurtzoids, were investigated, including energy gaps, bond lengths, spectral properties, such like infrared spectra and Raman. IR and Raman spectra were compared with experimental longitudinal optical modes frequency results. The theoretical results agree well with experiments and previous data. It has been found that the energy gap is increasing with the increased Mg concentration, and that the longitudinal optical position exposes a UV shift movement with an increase in the concentration.
{"title":"Concentration effect on the vibrational and electronic properties of MgXZn7-XO7 wurtzoids nanostructure via DFT","authors":"A.K. Sameer, M.N. Jasim, M.T. Hussein","doi":"10.15251/djnb.2023.184.1187","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1187","url":null,"abstract":"In the present work, the ternary compound MgxZn7-x O7Wurtzoid with variable Zn and Mg contents was analyzed using density functional theory with B3LYP 6-311G**basis set. The electronic and vibrational properties of MgxZn7-xO7 wurtzoids, were investigated, including energy gaps, bond lengths, spectral properties, such like infrared spectra and Raman. IR and Raman spectra were compared with experimental longitudinal optical modes frequency results. The theoretical results agree well with experiments and previous data. It has been found that the energy gap is increasing with the increased Mg concentration, and that the longitudinal optical position exposes a UV shift movement with an increase in the concentration.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136133385","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}
Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1169
N. Ahmad, R. Rajmi, Z. Mohamed
This study investigates the interaction between Co and Mn ions on spin state behaviour and magnetic frustration in hole-doped La0.6Dy0.1Ca0.3Co1-xMnxO3 (x = 0–1.0) cobaltite. It aims to understand the inducement of the double-exchange (DE) mechanism in this system. The samples were synthesised using the conventional solid-state synthesis method, and their crystal structure and magnetic properties were analysed. Rietveld refinement of X-ray diffraction data confirmed that La0.6Dy0.1Ca0.3Co1-xO3 (x = 0.0 and 0.2) samples had rhombohedral crystals structure with R c − 3 space group. An orthorhombic (Pbnm) perovskite structure was observed for the La0.6Dy0.1Ca0.3Co1-xMnxO3 (x = 0.4 –1.0) accompanied by increasing cell volume in the samples as the substitution level of Mn increases. Temperature dependence of resistivity ρ(T) shows semiconducting behaviour in the whole temperature and composition range of x = 0.0–0.8. However, further substitution with x = 0.9 and x = 1.0 give remarkable induced MI behaviour where the MI transition temperature (TMI) increased from 75 K and 132 K, respectively. The result suggests that Mn ions play an important role in the magnetic properties of the cobaltite, and the system can be tuned by adjusting the Mn concentration.
{"title":"The interaction between Co and Mn ions on the magnetic frustration and the inducement of the double-exchange mechanism in hole-doped La0.6Dy0.1Ca0.3Co1-xMnxO3 (x = 0–1.0) cobaltite","authors":"N. Ahmad, R. Rajmi, Z. Mohamed","doi":"10.15251/djnb.2023.184.1169","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1169","url":null,"abstract":"This study investigates the interaction between Co and Mn ions on spin state behaviour and magnetic frustration in hole-doped La0.6Dy0.1Ca0.3Co1-xMnxO3 (x = 0–1.0) cobaltite. It aims to understand the inducement of the double-exchange (DE) mechanism in this system. The samples were synthesised using the conventional solid-state synthesis method, and their crystal structure and magnetic properties were analysed. Rietveld refinement of X-ray diffraction data confirmed that La0.6Dy0.1Ca0.3Co1-xO3 (x = 0.0 and 0.2) samples had rhombohedral crystals structure with R c − 3 space group. An orthorhombic (Pbnm) perovskite structure was observed for the La0.6Dy0.1Ca0.3Co1-xMnxO3 (x = 0.4 –1.0) accompanied by increasing cell volume in the samples as the substitution level of Mn increases. Temperature dependence of resistivity ρ(T) shows semiconducting behaviour in the whole temperature and composition range of x = 0.0–0.8. However, further substitution with x = 0.9 and x = 1.0 give remarkable induced MI behaviour where the MI transition temperature (TMI) increased from 75 K and 132 K, respectively. The result suggests that Mn ions play an important role in the magnetic properties of the cobaltite, and the system can be tuned by adjusting the Mn concentration.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136133386","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}
Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1235
S. Senthil, V. Ratchagar, T. Thangeeswari, S. Srinivasan, R. Murugan
Pure Co3O4 nanomaterials were synthesized by using Sol-Gel technique at various pH levels (7, 8 and 9). Morphological and structural analysis was done by X-ray diffraction method (XRD), scanning electron microscope (SEM) and energy-dispersive spectroscopy EDX. The X-ray diffraction patterns revealed that the prepared samples crystallized in a cubic structure without any impurities. SEM micrographs validated the influence of pH in altering the morphology of the synthesized compound. The elemental spectrum analysis EDX confirms the presence of cobalt and oxygen without any impurities. Variation of dielectric constant, dielectric loss and impedance were analyzed for various temperatures and different pH values. Dielectric loss value increases at high temperature due to the thermal disturbance of the atoms. Cole-Cole impedance plot gives the information about grain and grain boundaries. DC electrical conductivity values of Co3O4 nanomaterials in the temperature range 40ºC to 250ºC increases with increase in pH level from 7 to 9. Arrhenius plot of Co3O4 nanoparticles confirmed that the activation energy at various temperature increases with increase in pH levels upto 8, then decreases for pH level 9.
{"title":"Impact of pH levels on the morphological, dielectric and impedance spectral behaviour of cobalt oxide nanomaterials","authors":"S. Senthil, V. Ratchagar, T. Thangeeswari, S. Srinivasan, R. Murugan","doi":"10.15251/djnb.2023.184.1235","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1235","url":null,"abstract":"Pure Co3O4 nanomaterials were synthesized by using Sol-Gel technique at various pH levels (7, 8 and 9). Morphological and structural analysis was done by X-ray diffraction method (XRD), scanning electron microscope (SEM) and energy-dispersive spectroscopy EDX. The X-ray diffraction patterns revealed that the prepared samples crystallized in a cubic structure without any impurities. SEM micrographs validated the influence of pH in altering the morphology of the synthesized compound. The elemental spectrum analysis EDX confirms the presence of cobalt and oxygen without any impurities. Variation of dielectric constant, dielectric loss and impedance were analyzed for various temperatures and different pH values. Dielectric loss value increases at high temperature due to the thermal disturbance of the atoms. Cole-Cole impedance plot gives the information about grain and grain boundaries. DC electrical conductivity values of Co3O4 nanomaterials in the temperature range 40ºC to 250ºC increases with increase in pH level from 7 to 9. Arrhenius plot of Co3O4 nanoparticles confirmed that the activation energy at various temperature increases with increase in pH levels upto 8, then decreases for pH level 9.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136132266","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}
Pub Date : 2023-10-30DOI: 10.15251/djnb.2023.184.1159
M. J. Dathan, B. F. Hassan, Q. A. Abduljabbarb, J. M. Rzaij
In this study, zinc oxide was doped with varying Nickel oxide nanostructured thin film concentrations using spray pyrolysis at 400 °C. At low Ni content, the ZnO phase exhibited polycrystalline structures, whereas a high Ni concentration resulted in the development of an additional NiO phase. The morphological analysis indicates the presence of nano-spherical structures at lower Ni concentrations, with nanoflakes embedded at varying orientations. The density of the nanoflakes structure was observed to increase as the Ni content was increased, enhancing the surface-to-volume ratio, which has potential applications in gas sensing. The highest sensitivity was detected for the sample doped with the highest Ni content, which can be attributed to its superior effective surface area. The optimal sensitivity was 45.26% at 200 °C.
{"title":"Nickel oxide doping impact on the NO2 sensing properties of nanostructured zinc oxide deposited by spray pyrolysis","authors":"M. J. Dathan, B. F. Hassan, Q. A. Abduljabbarb, J. M. Rzaij","doi":"10.15251/djnb.2023.184.1159","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1159","url":null,"abstract":"In this study, zinc oxide was doped with varying Nickel oxide nanostructured thin film concentrations using spray pyrolysis at 400 °C. At low Ni content, the ZnO phase exhibited polycrystalline structures, whereas a high Ni concentration resulted in the development of an additional NiO phase. The morphological analysis indicates the presence of nano-spherical structures at lower Ni concentrations, with nanoflakes embedded at varying orientations. The density of the nanoflakes structure was observed to increase as the Ni content was increased, enhancing the surface-to-volume ratio, which has potential applications in gas sensing. The highest sensitivity was detected for the sample doped with the highest Ni content, which can be attributed to its superior effective surface area. The optimal sensitivity was 45.26% at 200 °C.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136132269","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}
Pub Date : 2023-10-01DOI: 10.15251/djnb.2023.183.1125
D. A. Alorain, M. Elsafi, A. H. Almuqrin, S. Yasmin, M. I. Sayyed
Five ceramic samples have been considered termed as S1, S2, S3, S4, and S5 on the purpose of radiation shielding. Ceramic sample S1 specifies pure MgO (100 wt %) with no other addition of Barite (BaSO4), yet another samples S2, S3, S4, and S5 have been considered 10 wt %, 20 wt %, 30 wt %, and 50 wt % of Barite (BaSO4) instead of MgO. Few shielding parameters such as linear attenuation coefficients (LAC), effective atomic number (Zeff), equivalent atomic number (Zeq) and radiation absorption ratio (RAR) were calculated through Geant4 code and experimental technique for the interest of evaluating the radiation shielding strength of the considered ceramic samples. The value of LAC of the considered ceramic samples via Experimental and Geant4 code were found a negligible difference. Considered ceramic samples S5 presents the most suitable radiation shielding capacity comprising rest of the ceramic samples according to the value of LAC for low energy. Considered ceramic sample S5 with the composition of [MgO (50%)- BaSO4 (50%)] were provided lowest value of HVL, TVL, and MFP. Hence, the obvious concern is that greater amount of Barite (BaSO4) lift up the shielding ability MgO ceramic in place of MgO.
{"title":"Study the radiation attenuation properties of MgO/barite composite ceramics for photon shielding applications","authors":"D. A. Alorain, M. Elsafi, A. H. Almuqrin, S. Yasmin, M. I. Sayyed","doi":"10.15251/djnb.2023.183.1125","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1125","url":null,"abstract":"Five ceramic samples have been considered termed as S1, S2, S3, S4, and S5 on the purpose of radiation shielding. Ceramic sample S1 specifies pure MgO (100 wt %) with no other addition of Barite (BaSO4), yet another samples S2, S3, S4, and S5 have been considered 10 wt %, 20 wt %, 30 wt %, and 50 wt % of Barite (BaSO4) instead of MgO. Few shielding parameters such as linear attenuation coefficients (LAC), effective atomic number (Zeff), equivalent atomic number (Zeq) and radiation absorption ratio (RAR) were calculated through Geant4 code and experimental technique for the interest of evaluating the radiation shielding strength of the considered ceramic samples. The value of LAC of the considered ceramic samples via Experimental and Geant4 code were found a negligible difference. Considered ceramic samples S5 presents the most suitable radiation shielding capacity comprising rest of the ceramic samples according to the value of LAC for low energy. Considered ceramic sample S5 with the composition of [MgO (50%)- BaSO4 (50%)] were provided lowest value of HVL, TVL, and MFP. Hence, the obvious concern is that greater amount of Barite (BaSO4) lift up the shielding ability MgO ceramic in place of MgO.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135456940","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}
Pub Date : 2023-10-01DOI: 10.15251/djnb.2023.183.1139
J. A. Yousif, S. Alptekin, A. Ramizy
In this article, a novel application of germanium dioxide (GeO2) as a gas sensor is systematically reported. In detail, GeO2 layers were deposited on quartz and n-type Si substrates, as a function of laser pulses, using combined laser ablation and thermal spray coating approaches. The attained layer/s were methodically inspected in term of their morphological, structural, and optical features; specifically, highly crystalline GeO2 structure was obtained for samples prepared using 1500 pulses and above. In the meanwhile, the obtained particle diameters were found to be within the range of 15 to 274 nm, while the estimated optical band gaps exhibited values from 3.85 to 4.0 eV. Simultaneously, the gas sensing behavior demonstrated a well-oriented performance for all devices, however, devices treated with 2500 pulses delivered stable trend with sensitivity value as high as 3 × 10−6. The rise/fall period revealed an adequate outcome (~10 𝑠𝑠𝑠𝑠𝑠𝑠.) for gas sensors fabricated via pulses of 1000 and above, with respected to the working temperature. The proposed framework delivers a substitute technique towards 2D metal oxide based eco-friendly-gas sensor.
{"title":"Preparation and characterization of germanium dioxide nanostructure for gas sensor application: effect of laser parameters","authors":"J. A. Yousif, S. Alptekin, A. Ramizy","doi":"10.15251/djnb.2023.183.1139","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1139","url":null,"abstract":"In this article, a novel application of germanium dioxide (GeO2) as a gas sensor is systematically reported. In detail, GeO2 layers were deposited on quartz and n-type Si substrates, as a function of laser pulses, using combined laser ablation and thermal spray coating approaches. The attained layer/s were methodically inspected in term of their morphological, structural, and optical features; specifically, highly crystalline GeO2 structure was obtained for samples prepared using 1500 pulses and above. In the meanwhile, the obtained particle diameters were found to be within the range of 15 to 274 nm, while the estimated optical band gaps exhibited values from 3.85 to 4.0 eV. Simultaneously, the gas sensing behavior demonstrated a well-oriented performance for all devices, however, devices treated with 2500 pulses delivered stable trend with sensitivity value as high as 3 × 10−6. The rise/fall period revealed an adequate outcome (~10 𝑠𝑠𝑠𝑠𝑠𝑠.) for gas sensors fabricated via pulses of 1000 and above, with respected to the working temperature. The proposed framework delivers a substitute technique towards 2D metal oxide based eco-friendly-gas sensor.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135456945","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}
Pub Date : 2023-10-01DOI: 10.15251/djnb.2023.183.1105
A. I. M. A’srai, M. H. Razali, K. A. M. Amin, U. M. Osman
Many studies have been performed to degrade the methyl orange (MO) dye by introducing titanium dioxide (TiO2) semiconductor material as photocatalyst because TiO2 having unique characterizations such as low toxicity and good chemical stability. However, its photocatalytic reaction is limited by low surface area as well as the rapid recombination of photogenerated electron-hole pairs and only has ability to absorb a small fraction (<5%) of indoor light. Therefore, in this study, copper oxide/titanium dioxide (CuO/TiO2) nanocomposite photocatalyst was proposed and synthesized using wet precipitation method. The synthesised photocatalyst was characterized by using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), Scanning electron microscopy (SEM), Energy dispersive x-ray (EDX), Thermogravimetric analysis (TGA), Nitrogen gas adsorption-desorption Brunauer, Emmett, teller (BET) and UV-Visible Spectroscopy. Spectra obtained from FTIR have proved that there are existence of O-H stretching, O-H bending and metal-oxygen bond that correlates to the functional groups of the samples. As affirmed by XRD analysis, crystalline anatase TiO2 phase was obtained for pure TiO2 samples. Anatase TiO2 phase is remained, and the additional peaks belong to copper oxide was observed for CuO/TiO2 nanocomposite photocatalyst sample suggesting that copper oxide was successfully loaded onto TiO2. The morphological study from SEM shows the presence of irregular particles of copper oxide and agglomerated TiO2 bulk particles. The CuO/TiO2 nanocomposite photocatalyst's presence of copper, titanium, and oxygen was confirmed by EDX analysis. TGA results show that pure CuO, TiO2 and CuO/TiO2 nanocomposite photocatalyst were thermally stable as only 6.7, 6.8 and 7.9 % weight loss were observed, due to the water removal. The specific surface area of CuO, TiO2 and CuO/TiO2 composite photocatalysts were found to be 20.50 m2 /g, 15.26 m2 /g and 37.12 m2 /g, respectively. They also exhibit type IV isotherms which is indicated the presence of mesopores in sample. This mesoporous structure provided high pore size within 2 to 50 nm in the sample. The photocatalytic activity study demonstrates that the 1.0 g CuO/TiO2 with the ratio of (0.5:1) could degraded 90.46 % of 10 ppm Methyl Orange (MO) dye at pH 6, which is better than pure TiO2, pure CuO and other CuO/TiO2 nanocomposites after 3 hours reaction. This is attributed to the presence of CuO at optimum amount which can increased the surface area, promoted electron-hole separation, and decelerated the charge carrier recombination. At 1 ppm MO, 100 % degradation was observed using similar photocatalyst and condition. However, the degradation rate of Methylene Blue (MB) and phenol was slightly reduced to almost 95.47 % and 80.65 % after 180 minutes reaction, due to their chemical structure and stability.
{"title":"CuO/TiO2 nanocomposite photocatalyst for efficient MO degradation","authors":"A. I. M. A’srai, M. H. Razali, K. A. M. Amin, U. M. Osman","doi":"10.15251/djnb.2023.183.1105","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.1105","url":null,"abstract":"Many studies have been performed to degrade the methyl orange (MO) dye by introducing titanium dioxide (TiO2) semiconductor material as photocatalyst because TiO2 having unique characterizations such as low toxicity and good chemical stability. However, its photocatalytic reaction is limited by low surface area as well as the rapid recombination of photogenerated electron-hole pairs and only has ability to absorb a small fraction (<5%) of indoor light. Therefore, in this study, copper oxide/titanium dioxide (CuO/TiO2) nanocomposite photocatalyst was proposed and synthesized using wet precipitation method. The synthesised photocatalyst was characterized by using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), Scanning electron microscopy (SEM), Energy dispersive x-ray (EDX), Thermogravimetric analysis (TGA), Nitrogen gas adsorption-desorption Brunauer, Emmett, teller (BET) and UV-Visible Spectroscopy. Spectra obtained from FTIR have proved that there are existence of O-H stretching, O-H bending and metal-oxygen bond that correlates to the functional groups of the samples. As affirmed by XRD analysis, crystalline anatase TiO2 phase was obtained for pure TiO2 samples. Anatase TiO2 phase is remained, and the additional peaks belong to copper oxide was observed for CuO/TiO2 nanocomposite photocatalyst sample suggesting that copper oxide was successfully loaded onto TiO2. The morphological study from SEM shows the presence of irregular particles of copper oxide and agglomerated TiO2 bulk particles. The CuO/TiO2 nanocomposite photocatalyst's presence of copper, titanium, and oxygen was confirmed by EDX analysis. TGA results show that pure CuO, TiO2 and CuO/TiO2 nanocomposite photocatalyst were thermally stable as only 6.7, 6.8 and 7.9 % weight loss were observed, due to the water removal. The specific surface area of CuO, TiO2 and CuO/TiO2 composite photocatalysts were found to be 20.50 m2 /g, 15.26 m2 /g and 37.12 m2 /g, respectively. They also exhibit type IV isotherms which is indicated the presence of mesopores in sample. This mesoporous structure provided high pore size within 2 to 50 nm in the sample. The photocatalytic activity study demonstrates that the 1.0 g CuO/TiO2 with the ratio of (0.5:1) could degraded 90.46 % of 10 ppm Methyl Orange (MO) dye at pH 6, which is better than pure TiO2, pure CuO and other CuO/TiO2 nanocomposites after 3 hours reaction. This is attributed to the presence of CuO at optimum amount which can increased the surface area, promoted electron-hole separation, and decelerated the charge carrier recombination. At 1 ppm MO, 100 % degradation was observed using similar photocatalyst and condition. However, the degradation rate of Methylene Blue (MB) and phenol was slightly reduced to almost 95.47 % and 80.65 % after 180 minutes reaction, due to their chemical structure and stability.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135457651","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}
Pub Date : 2023-09-20DOI: 10.15251/djnb.2023.183.1085
G. Gelashvili, D. Gelenidze, D. Jishiashvili, Z. Shiolashvili, N. Makhatadze, A. Jishiashvili, V. Gobronidze
The influence of ZnO nanomaterial morphologies on their photocatalytic activity was studied. The ZnO nanobelts and the network of hexagonal disks were grown by pyrolysis in ammonium chloride. ZnO tetrapods were produced by plasma-assisted technology. The nanobelts and tetrapod arms were growing along the c-axis. The sidewalls of nanobelts comprise (21�1�0) and (011�0) plane, while the needle-shape arms of tetrapods are known to consist of altering {011�0} and semi-polar {101�1} facets. The hexagonal ZnO disks have exposed mainly (+0001) facets with the highest surface energy. They showed the highest photocatalytic activity for the degradation of methylene blue, dissolved in water to a concentration of 100 mg/L.
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