Pub Date : 2023-03-01DOI: 10.15251/djnb.2023.181.343
M. Bharathi, K. Anuradha, M. Murugendrappa
In-situ polymerization of a series of nanocomposites viz. 10, 20, 30, 40 and 50 wt % of Praseodymium Calcium Manganite Oxide (Pr0.75Ca0.25MnO3) (PCM) nano manganites in polypyrrole (PPy) were prepared by chemical polymerization technique. The crystalline nature of all the nanocomposites was confirmed by powder X-ray diffraction (XRD). The orthorhombic structure with space group Pnma was confirmed by the well-fitted Rietveld refined XRD data. The average particle size was observed to be in the range of 42 to 60 nm. Scanning Electron Microscope (SEM) confirmed the spherical nature of the particles. The TEM confirmed the crystallinity and Fourier Transform Infra-Red Spectroscopy (FTIR) showed that the stretching frequencies shifted towards higher frequencies for the nanocomposites suggesting better conjugation due to chemical interaction between the PPy and PCM particles. AC conductivity versus frequency showed that at higher frequencies the AC increases obeying Jonscher’s power law. The correlated barrier hopping (CBH) model is therefore used to describe the conduction mechanism. For all composites, the dielectric constant and tangent loss revealed a frequency- and temperaturedependent character. The real and imaginary impedance were both frequency and temperature dependent. The impedance data were analyzed by fitting Nyquist plots using ZsimpWin software which confirmed non Debye type of behavior. This study highlights on the interactions between conduction processes, grain boundaries, and grains.
{"title":"Structural, AC conductivity, dielectric and impedance studies of polypyrrole/praseodymium calcium manganite nanocomposites","authors":"M. Bharathi, K. Anuradha, M. Murugendrappa","doi":"10.15251/djnb.2023.181.343","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.343","url":null,"abstract":"In-situ polymerization of a series of nanocomposites viz. 10, 20, 30, 40 and 50 wt % of Praseodymium Calcium Manganite Oxide (Pr0.75Ca0.25MnO3) (PCM) nano manganites in polypyrrole (PPy) were prepared by chemical polymerization technique. The crystalline nature of all the nanocomposites was confirmed by powder X-ray diffraction (XRD). The orthorhombic structure with space group Pnma was confirmed by the well-fitted Rietveld refined XRD data. The average particle size was observed to be in the range of 42 to 60 nm. Scanning Electron Microscope (SEM) confirmed the spherical nature of the particles. The TEM confirmed the crystallinity and Fourier Transform Infra-Red Spectroscopy (FTIR) showed that the stretching frequencies shifted towards higher frequencies for the nanocomposites suggesting better conjugation due to chemical interaction between the PPy and PCM particles. AC conductivity versus frequency showed that at higher frequencies the AC increases obeying Jonscher’s power law. The correlated barrier hopping (CBH) model is therefore used to describe the conduction mechanism. For all composites, the dielectric constant and tangent loss revealed a frequency- and temperaturedependent character. The real and imaginary impedance were both frequency and temperature dependent. The impedance data were analyzed by fitting Nyquist plots using ZsimpWin software which confirmed non Debye type of behavior. This study highlights on the interactions between conduction processes, grain boundaries, and grains.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43563804","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.367
K. Kannan, S. Agilan, P. Peulakumari, G. Saveetha
CuO/PVA-PEG nanocomposites were prepared by solvent casting method. In XRD spectra, the shifting of peak position and the absence of remaining characteristics peaks of CuO nanoparticles in CuO/PVA-PEG indicates the formation exfoliated nanocomposites. The SEM image reveals the complete dispersion of the nanofillers in polymer matrix. FTIR spectra revealed the formation of strong H-bonds between PVA and PEG during mixing. The absorption and transmission properties of the sample were studied by UV-Vis studies. Z-scan analysis confirms the presence of two-photon absorption in the sample. The synthesized polymer nanocomposite exhibits optical nonlinearity due to the excitonexciton interaction.
{"title":"Exploration of third order nonlinear optical features of CuO/PVA-PEG polymer nanocomposites","authors":"K. Kannan, S. Agilan, P. Peulakumari, G. Saveetha","doi":"10.15251/djnb.2023.181.367","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.367","url":null,"abstract":"CuO/PVA-PEG nanocomposites were prepared by solvent casting method. In XRD spectra, the shifting of peak position and the absence of remaining characteristics peaks of CuO nanoparticles in CuO/PVA-PEG indicates the formation exfoliated nanocomposites. The SEM image reveals the complete dispersion of the nanofillers in polymer matrix. FTIR spectra revealed the formation of strong H-bonds between PVA and PEG during mixing. The absorption and transmission properties of the sample were studied by UV-Vis studies. Z-scan analysis confirms the presence of two-photon absorption in the sample. The synthesized polymer nanocomposite exhibits optical nonlinearity due to the excitonexciton interaction.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42839532","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.263
Z. Radi, S. Tlili, K. Layadi, L. Louail, A. Yells-Chaouche, Y. Madhekour, S. Guettouche
In this study, the elastic properties of two high-pressure polymorphs SiO2 nanostructure, stishovite and CaCl2-type, are obtained using Density Functional Theory in 0-80 GPa high pressure domain at zero temperature, based on reducing an interacting many-electron problem to a single-electron problem. It is shown that below 40 GPa, the stishovite phase is more stable; superior to this limit, the CaCl2-type phase becomes more stable, using Gibbs free energy method. Furthermore, the pressure dependence of the density, volume, bulk, and shear moduli were defined in the selected pressure domain.
{"title":"Elastic properties of SiO2 nanostructure in high-pressure conditions","authors":"Z. Radi, S. Tlili, K. Layadi, L. Louail, A. Yells-Chaouche, Y. Madhekour, S. Guettouche","doi":"10.15251/djnb.2023.181.263","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.263","url":null,"abstract":"In this study, the elastic properties of two high-pressure polymorphs SiO2 nanostructure, stishovite and CaCl2-type, are obtained using Density Functional Theory in 0-80 GPa high pressure domain at zero temperature, based on reducing an interacting many-electron problem to a single-electron problem. It is shown that below 40 GPa, the stishovite phase is more stable; superior to this limit, the CaCl2-type phase becomes more stable, using Gibbs free energy method. Furthermore, the pressure dependence of the density, volume, bulk, and shear moduli were defined in the selected pressure domain.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44061932","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.291
R. Jagadeeswari, G. Rathika, K. Satheesh kumar, P. Selvakumar
The study reports feasibility to synthesis copper loaded ZnO nanoparticles using a green synthesis approach influenced by natural extracts from waste maize materials is explored. Different methods were used to investigate the physicochemical characteristics of Cu-ZnO nanoparticles. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies were used to investigate the structural behavior of Cu-ZnO nanoparticles. XRD analysis shows that Cu-ZnO has a typical crystallite size of 23.5nm and a confirmed hexagonal structure. In the wavenumber range 400–600 cm-1 , FT-IR confirmed the presence of metallic elements in Cu-ZnO samples. Through the use of UV–vis spectroscopy, we were able to investigate the optical characteristics of Cu-ZnO. The samples' surface morphology was recorded by FESEM, and their elemental content was evaluated by EDX. This verifies the spherical shape of prepared samples with homogeneous size distributions across their structures. The nanostructured redox behaviour of electroactive Cu-ZnO has been investigated by cyclic voltammetry
{"title":"Electrochemical, structural, optical, and morphological characteristics of Cu-loaded ZnO nanostructures synthesized from bio-waste (maize) using a green synthesis technique","authors":"R. Jagadeeswari, G. Rathika, K. Satheesh kumar, P. Selvakumar","doi":"10.15251/djnb.2023.181.291","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.291","url":null,"abstract":"The study reports feasibility to synthesis copper loaded ZnO nanoparticles using a green synthesis approach influenced by natural extracts from waste maize materials is explored. Different methods were used to investigate the physicochemical characteristics of Cu-ZnO nanoparticles. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies were used to investigate the structural behavior of Cu-ZnO nanoparticles. XRD analysis shows that Cu-ZnO has a typical crystallite size of 23.5nm and a confirmed hexagonal structure. In the wavenumber range 400–600 cm-1 , FT-IR confirmed the presence of metallic elements in Cu-ZnO samples. Through the use of UV–vis spectroscopy, we were able to investigate the optical characteristics of Cu-ZnO. The samples' surface morphology was recorded by FESEM, and their elemental content was evaluated by EDX. This verifies the spherical shape of prepared samples with homogeneous size distributions across their structures. The nanostructured redox behaviour of electroactive Cu-ZnO has been investigated by cyclic voltammetry","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42741322","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.307
A. Shuaib, F. Mannan, Z. Ali, H. Rehman, M. H. Farooq, T. G. Shahzady
ZnO is an important semiconductor due to its unique structural, mechanical and optical properties. In this study pure ZnO pallets and Co3O4 doped ZnO pallets with varying molar concentration of dopant i.e 2% 4% 6% 8% and 10% were prepared by using hydraulic press. X-ray diffraction (XRD), FTIR and Vickers indentation method is used for pallets characterization. The XRD analysis revealed that the pure ZnO and doped ZnO pallet samples have hexagonal wurtzite structure. Vickers Hardness test showed that pure ZnO pallet has maximum hardness as compared to the Co3O4 doped ZnO pallets. FTIR analysis used to examine the bonding properties of synthesized Co doped ZnO. Doped materials with varying concentration were applied against different gram positive and gram negative bacterial strains. A considerable increase in antibacterial activity was observed by increasing the concentration of Co3O4 dopant.
{"title":"Investigation the effect of Co3O4 doping on structural and mechanical properties of ZnO pallets synthesized by powder metallurgy method and their biological evaluation","authors":"A. Shuaib, F. Mannan, Z. Ali, H. Rehman, M. H. Farooq, T. G. Shahzady","doi":"10.15251/djnb.2023.181.307","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.307","url":null,"abstract":"ZnO is an important semiconductor due to its unique structural, mechanical and optical properties. In this study pure ZnO pallets and Co3O4 doped ZnO pallets with varying molar concentration of dopant i.e 2% 4% 6% 8% and 10% were prepared by using hydraulic press. X-ray diffraction (XRD), FTIR and Vickers indentation method is used for pallets characterization. The XRD analysis revealed that the pure ZnO and doped ZnO pallet samples have hexagonal wurtzite structure. Vickers Hardness test showed that pure ZnO pallet has maximum hardness as compared to the Co3O4 doped ZnO pallets. FTIR analysis used to examine the bonding properties of synthesized Co doped ZnO. Doped materials with varying concentration were applied against different gram positive and gram negative bacterial strains. A considerable increase in antibacterial activity was observed by increasing the concentration of Co3O4 dopant.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46298619","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.315
G. Xu, C. Q. Li, C. Wang, Z. Xue, F. Liang, X. Shen, J. J. Wang, A. Amirfazli
In this study, zinc oxide (ZnO) nanoparticles were modified by means of dispersion using a γ-aminopropyl triethoxysilane coupling agent (KH550), obtaining KH550-ZnO. Then a certain amount of SBMA powder was put into the KH550-ZnO solution, and the ensuing polymerization reaction produced super hydrophilic PSBMA-KH550-ZnO powder. Finally, several polished aluminum sheets were immersed in the PSBMA-KH550-ZnO aqueous solution to start deposition. Upon completion of the deposition, the aluminum sheets were taken out and dried to obtain samples of the ZnO@PSBMA super hydrophilic coating. The structure, morphology and chemical composition of the powders and coatings were investigated by SEM, IR and EDS. The dispersion of KH550-ZnO in aqueous solution was analyzed. The results show that the particle size of KH550-ZnO decreases greatly in aqueous solution. The substrate can be superhydrophilic when deposited in PSBMA-KH550-ZnO aqueous solution for 130 minutes，After 48 hours of coating deposition, the compactness, roughness and friction resistance of the coating are greatly improved. ZnO@PSBMA superhydrophilic coating has good anti-protein, anti-bacterial and anti-algal adhesion properties.
{"title":"Preparation and anti-biological adhesion performance evaluation of ZNO@PSBMA super hydrophilic coating","authors":"G. Xu, C. Q. Li, C. Wang, Z. Xue, F. Liang, X. Shen, J. J. Wang, A. Amirfazli","doi":"10.15251/djnb.2023.181.315","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.315","url":null,"abstract":"In this study, zinc oxide (ZnO) nanoparticles were modified by means of dispersion using a γ-aminopropyl triethoxysilane coupling agent (KH550), obtaining KH550-ZnO. Then a certain amount of SBMA powder was put into the KH550-ZnO solution, and the ensuing polymerization reaction produced super hydrophilic PSBMA-KH550-ZnO powder. Finally, several polished aluminum sheets were immersed in the PSBMA-KH550-ZnO aqueous solution to start deposition. Upon completion of the deposition, the aluminum sheets were taken out and dried to obtain samples of the ZnO@PSBMA super hydrophilic coating. The structure, morphology and chemical composition of the powders and coatings were investigated by SEM, IR and EDS. The dispersion of KH550-ZnO in aqueous solution was analyzed. The results show that the particle size of KH550-ZnO decreases greatly in aqueous solution. The substrate can be superhydrophilic when deposited in PSBMA-KH550-ZnO aqueous solution for 130 minutes，After 48 hours of coating deposition, the compactness, roughness and friction resistance of the coating are greatly improved. ZnO@PSBMA superhydrophilic coating has good anti-protein, anti-bacterial and anti-algal adhesion properties.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43484763","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.299
L. Prabhu, V. Selvakumar, A. Anderson, C. Dhavamani
TPI, also known as artificial eucommia rubber, is a thermo-responsive SMP created by molecular recombination and modification with contemporary polymer synthesis and modification techniques. In this paper, TPI shape memory polymer is reinforced with different weight proportions (0, 0.2%, 0.4%, 0.6%, 0.8% and 1%) of carbon nanotube (CNT) and specimens were fabricated with the aim of enhancing the properties of neat TPI polymer composites. Some thermo-mechanical characteristics were investigated and interpreted, including the differential scanning calorimeter (DSC) test, dynamic mechanical analysis (DMA) test, thermal conductivity test, compression test, and a few shape memory properties such as shape recovery ratio and shape recovery rate. TPI shape memory polymers exhibit strong shape memory capabilities and the best mechanical properties based on the testing results for the specimen TPI with 0.8% CNT weight fraction.
{"title":"Influence of CNT fillers on the thermal, mechanical and shape memory properties of TPI shape memory polymer composites","authors":"L. Prabhu, V. Selvakumar, A. Anderson, C. Dhavamani","doi":"10.15251/djnb.2023.181.299","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.299","url":null,"abstract":"TPI, also known as artificial eucommia rubber, is a thermo-responsive SMP created by molecular recombination and modification with contemporary polymer synthesis and modification techniques. In this paper, TPI shape memory polymer is reinforced with different weight proportions (0, 0.2%, 0.4%, 0.6%, 0.8% and 1%) of carbon nanotube (CNT) and specimens were fabricated with the aim of enhancing the properties of neat TPI polymer composites. Some thermo-mechanical characteristics were investigated and interpreted, including the differential scanning calorimeter (DSC) test, dynamic mechanical analysis (DMA) test, thermal conductivity test, compression test, and a few shape memory properties such as shape recovery ratio and shape recovery rate. TPI shape memory polymers exhibit strong shape memory capabilities and the best mechanical properties based on the testing results for the specimen TPI with 0.8% CNT weight fraction.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47862191","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.327
M. Safi, A. Aissat, H. Guesmi, J. Vilcot
This study focuses on modelling and optimizing a new Si nanowire solar cell containing a SiGe/Si quantum well. Quantum efficiency measurements show that the proposed structure has a higher energy absorption advantage and stronger than that of a solar cell based on a standard Si p-i-n nanowire. As a result, the insertion of 14 layers of SiGe/Si quantum well improved the short circuit current density and the efficiency by a factor of about 1.24 and 1.37, respectively. The best concentration and radius values obtained are x = 0.05 and r = 0.190 µm, respectively, with a strain of less than 1%.
{"title":"SiGe quantum wells implementation in Si based nanowires for solar cells applications","authors":"M. Safi, A. Aissat, H. Guesmi, J. Vilcot","doi":"10.15251/djnb.2023.181.327","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.327","url":null,"abstract":"This study focuses on modelling and optimizing a new Si nanowire solar cell containing a SiGe/Si quantum well. Quantum efficiency measurements show that the proposed structure has a higher energy absorption advantage and stronger than that of a solar cell based on a standard Si p-i-n nanowire. As a result, the insertion of 14 layers of SiGe/Si quantum well improved the short circuit current density and the efficiency by a factor of about 1.24 and 1.37, respectively. The best concentration and radius values obtained are x = 0.05 and r = 0.190 µm, respectively, with a strain of less than 1%.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42389893","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.279
K. Dallah, A. Bellel, O. C. Lezzar, S. Sahli
In this paper, nano-porous thin films capacitive-type sensors have been fabricated for the detection of volatile organic compounds (VOCs) using the micro sized interdigitated electrodes (IDEs). The sensitive layers were elaborated from hexamethyldisiloxane (HMDSO) using plasma enhanced chemical vapor deposition (PECVD) technique. The choice of HMDSO polymer as sensitive layer is based on its low dielectric constant compared to analytes ones. The sensing performances of plasma polymers were strongly correlated to their chemical and physical properties, which depend directly on the plasma polymerization conditions including monomer pressure. The sensor sensitivity was at its highest value of 0.32, 0.24 and 0.20 pF/ppm towards methanol, ethanol and acetone, respectively, for the device fabricated with the smallest gap (36 µm) and higher monomer pressure (50 Pa). Chemical and morphological structures of the elaborated thin sensitive layers have been investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) and scanning electron microscope (SEM), respectively.
{"title":"Capacitive response of nanoporous HMDSO film coated interdigited electrodes towards VOCs molecules","authors":"K. Dallah, A. Bellel, O. C. Lezzar, S. Sahli","doi":"10.15251/djnb.2023.181.279","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.279","url":null,"abstract":"In this paper, nano-porous thin films capacitive-type sensors have been fabricated for the detection of volatile organic compounds (VOCs) using the micro sized interdigitated electrodes (IDEs). The sensitive layers were elaborated from hexamethyldisiloxane (HMDSO) using plasma enhanced chemical vapor deposition (PECVD) technique. The choice of HMDSO polymer as sensitive layer is based on its low dielectric constant compared to analytes ones. The sensing performances of plasma polymers were strongly correlated to their chemical and physical properties, which depend directly on the plasma polymerization conditions including monomer pressure. The sensor sensitivity was at its highest value of 0.32, 0.24 and 0.20 pF/ppm towards methanol, ethanol and acetone, respectively, for the device fabricated with the smallest gap (36 µm) and higher monomer pressure (50 Pa). Chemical and morphological structures of the elaborated thin sensitive layers have been investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) and scanning electron microscope (SEM), respectively.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45694078","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 : 2023-03-01DOI: 10.15251/djnb.2023.181.377
R. Renjithkumar, B. Iffath, T. Devasena
1, 4 dioxane predominantly found in industrial effluents and air force plants, is of great concern worldwide due to its toxic and carcinogenic nature. Currently, there are limited research on 1,4 dioxane sensors and most of these sensors are intricate metal oxide composites. This study reports the fabrication of novel inherently electroactive graphene oxide nanosheets derived from a natural polyphenolic compound, and the process parameters were statistically optimized using TOPSIS based Taguchi L9 orthogonal array. The proposed novel sensor was employed in the linear range (0.1µM to 3µM) that conforms with the WHO guideline (0.56 µM) for dioxane in water, showed good sensitivity (117 nAnM-1 cm-2 ), detection limit (20.51 nM) and quantification limit (62.16 nM) which is far superior compared to the reported literature on dioxane sensing systems.
{"title":"Novel statistically optimized one pot synthesis of inherently photoluminescent and electroactive graphene oxide nanosheets as 1, 4 dioxane sensor","authors":"R. Renjithkumar, B. Iffath, T. Devasena","doi":"10.15251/djnb.2023.181.377","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.377","url":null,"abstract":"1, 4 dioxane predominantly found in industrial effluents and air force plants, is of great concern worldwide due to its toxic and carcinogenic nature. Currently, there are limited research on 1,4 dioxane sensors and most of these sensors are intricate metal oxide composites. This study reports the fabrication of novel inherently electroactive graphene oxide nanosheets derived from a natural polyphenolic compound, and the process parameters were statistically optimized using TOPSIS based Taguchi L9 orthogonal array. The proposed novel sensor was employed in the linear range (0.1µM to 3µM) that conforms with the WHO guideline (0.56 µM) for dioxane in water, showed good sensitivity (117 nAnM-1 cm-2 ), detection limit (20.51 nM) and quantification limit (62.16 nM) which is far superior compared to the reported literature on dioxane sensing systems.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45780827","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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