Pub Date : 2022-08-10DOI: 10.37819/nanofab.007.212
Narendra Pratap Singh, Shivam Prajapati, Prateek, R. Gupta
We present a green route for the colloidal synthesis of undoped and silver (Ag) doped cadmium sulfide (CdS) quantum dots (QDs). We have used olive oil as the reaction medium, which acted as a source of oleic acid (OA) ligand in the green synthesis of CdS QDs. With the increase in OA concentration, the dispersibility of CdS QDs improved. The water-dispersible CdS QDs were prepared via exchanging OA’s associated ligand with 3-mercaptopropionic acid (MPA). The MPA-capped CdS QDs showed the disappearance of the S-H peak as characterized via FTIR. The crystal and optical properties of Ag-doped CdS QDs were investigated, and the spectral red shift in the absorption spectra was observed. The CdS QDs with low Ag doping concentration increased the lifetime of excitons, but the average lifetime was suppressed at a higher concentration. We also discussed the variation in the properties of the CdS QDs through ligand engineering and Ag doping. These doped and undoped QDs have the potential for applications in photocatalysis, water splitting, solar cells, etc. In addition, water dispersible QDs can be helpful for bioimaging, and drug delivery applications
{"title":"Investigation of Ag doping and ligand engineering on green synthesized CdS quantum dots for tuning their optical properties","authors":"Narendra Pratap Singh, Shivam Prajapati, Prateek, R. Gupta","doi":"10.37819/nanofab.007.212","DOIUrl":"https://doi.org/10.37819/nanofab.007.212","url":null,"abstract":"We present a green route for the colloidal synthesis of undoped and silver (Ag) doped cadmium sulfide (CdS) quantum dots (QDs). We have used olive oil as the reaction medium, which acted as a source of oleic acid (OA) ligand in the green synthesis of CdS QDs. With the increase in OA concentration, the dispersibility of CdS QDs improved. The water-dispersible CdS QDs were prepared via exchanging OA’s associated ligand with 3-mercaptopropionic acid (MPA). The MPA-capped CdS QDs showed the disappearance of the S-H peak as characterized via FTIR. The crystal and optical properties of Ag-doped CdS QDs were investigated, and the spectral red shift in the absorption spectra was observed. The CdS QDs with low Ag doping concentration increased the lifetime of excitons, but the average lifetime was suppressed at a higher concentration. We also discussed the variation in the properties of the CdS QDs through ligand engineering and Ag doping. These doped and undoped QDs have the potential for applications in photocatalysis, water splitting, solar cells, etc. In addition, water dispersible QDs can be helpful for bioimaging, and drug delivery applications","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48999865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.37819/nanofab.007.201
Alisa Khodadadi, Atefeh Zarepour, S. Abbaszadeh, M. Firoozi, Fatemeh Bahrami-Banan, Amir Rabiee, Mahnaz Hassanpour, Mehraneh Kermanian, Samiramis Pourmotabed, A. Zarrabi, Omid Moradi, Sepideh Yousefiasl, A. Iranbakhsh, S. M. Mirkhan, E. Zare, M. Ghomi, Saeed Beigi-Boroujeni, A. C. Paiva-Santos, Y. Vasseghian, Pooyan Makvandi, E. Sharifi
As the first cause of death in the last three years, SARS-CoV-2 infection gained lots of interest. In light of this, several studies have been done to fabricate novel, high-speed detection methods for different virus variants. Indeed, the high mortality rate that could result from the late detection and the probable false results of conventional tests used to detect infection led to the introduction. Among the most interesting of them are -based biosensors fabricated from inorganic-based nanomaterials to diagnose SARS-CoV-2. Accordingly, this review paper presents an overview of recent nanotechnology advances in fabricating biosensors for diagnosing SARS-CoV-2 infections.
{"title":"Nanotechnology for SARS-CoV-2 diagnosis","authors":"Alisa Khodadadi, Atefeh Zarepour, S. Abbaszadeh, M. Firoozi, Fatemeh Bahrami-Banan, Amir Rabiee, Mahnaz Hassanpour, Mehraneh Kermanian, Samiramis Pourmotabed, A. Zarrabi, Omid Moradi, Sepideh Yousefiasl, A. Iranbakhsh, S. M. Mirkhan, E. Zare, M. Ghomi, Saeed Beigi-Boroujeni, A. C. Paiva-Santos, Y. Vasseghian, Pooyan Makvandi, E. Sharifi","doi":"10.37819/nanofab.007.201","DOIUrl":"https://doi.org/10.37819/nanofab.007.201","url":null,"abstract":"As the first cause of death in the last three years, SARS-CoV-2 infection gained lots of interest. In light of this, several studies have been done to fabricate novel, high-speed detection methods for different virus variants. Indeed, the high mortality rate that could result from the late detection and the probable false results of conventional tests used to detect infection led to the introduction. Among the most interesting of them are -based biosensors fabricated from inorganic-based nanomaterials to diagnose SARS-CoV-2. Accordingly, this review paper presents an overview of recent nanotechnology advances in fabricating biosensors for diagnosing SARS-CoV-2 infections. ","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43156040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-29DOI: 10.37819/nanofab.007.200
Vineet Kumar, Anuj Kumar, Rajesh K. Chhatra, Dong Le
In this work, we incorporate titanium dioxide (TiO2) particles as fillers into room temperature vulcanized silicone rubber (RTV-SR) and fabricated the RTV-SR/TiO2 composites. Herein, the effect of various surface areas of TiO2 particles on the mechanical properties of RTV-SR/TiO2 composites was investigated. The particle size of different types of TiO2 particles (147 nm, 34 nm, and 29 nm) was measured by using scanning electron microscopy (SEM), whereas the Brunauer–Emmett–Teller (BET) surface area was measured through adsorption-desorption isotherms as 3, 50, and 145 m2/g, respectively. TiO2 particles reinforced RTV-SR composites were prepared by solution mixing method. TiO2 particles with smaller particle sizes and high BET surface area exhibited higher mechanical properties. The compressive moduli were obtained as 2.2 MPa for a virgin sample and increased to 2.6 MPa, 2.8 MPa and 3.24 MPa for 3, 50, and 145 m2/g samples respectively at 6 phr filler loading. Similarly, the fracture strain of the composite was 117% for a virgin sample and changed to 94%, 130%, and 205% for 3, 50, and 145 m2/g samples, respectively, at 8 phr filler loading. The surface area and particle size of the fillers showed significant effect on mechanical properties of the composites, but no significant effect was observed on the energy harvesting values of RTV-SR/TiO2 composites.
{"title":"Studies on high performance rubber composites by incorporating titanium dioxide particles with different surface area and particle size","authors":"Vineet Kumar, Anuj Kumar, Rajesh K. Chhatra, Dong Le","doi":"10.37819/nanofab.007.200","DOIUrl":"https://doi.org/10.37819/nanofab.007.200","url":null,"abstract":"In this work, we incorporate titanium dioxide (TiO2) particles as fillers into room temperature vulcanized silicone rubber (RTV-SR) and fabricated the RTV-SR/TiO2 composites. Herein, the effect of various surface areas of TiO2 particles on the mechanical properties of RTV-SR/TiO2 composites was investigated. The particle size of different types of TiO2 particles (147 nm, 34 nm, and 29 nm) was measured by using scanning electron microscopy (SEM), whereas the Brunauer–Emmett–Teller (BET) surface area was measured through adsorption-desorption isotherms as 3, 50, and 145 m2/g, respectively. TiO2 particles reinforced RTV-SR composites were prepared by solution mixing method. TiO2 particles with smaller particle sizes and high BET surface area exhibited higher mechanical properties. The compressive moduli were obtained as 2.2 MPa for a virgin sample and increased to 2.6 MPa, 2.8 MPa and 3.24 MPa for 3, 50, and 145 m2/g samples respectively at 6 phr filler loading. Similarly, the fracture strain of the composite was 117% for a virgin sample and changed to 94%, 130%, and 205% for 3, 50, and 145 m2/g samples, respectively, at 8 phr filler loading. The surface area and particle size of the fillers showed significant effect on mechanical properties of the composites, but no significant effect was observed on the energy harvesting values of RTV-SR/TiO2 composites.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46373722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-20DOI: 10.37819/nanofab.007.198
F. Mia, Mershen Govender, Sunaina Indermun, Pradeep Kumar, L. D. Toit, Y. Choonara
Alcoholism is a highly prevalent disease, with successful rehabilitation being poor due to irrepressible cravings that result in relapse. This study developed and analysed an intramuscular injection capable of providing a sustained release of disulfiram over one month. Statistically optimized disulfiram-loaded nanomicelles were prepared and incorporated into a thermosensitive gel resulting in a nano-enclatherated-gel-composite (NEGC). The nanomicelle system demonstrated a drug loading capacity and entrapment efficiency of 33.66% and 50.98%, respectively, with a sustained release of 65% of the administered disulfiram achieved after 28 days through the thermosensitive hydrogel. Additionally, ex vivo release studies have been undertaken using rat muscle tissue with in vivo biodistribution, plasma levels, histopathology and myotoxicity following oral disulfiram administration and intramuscular NEGC administration also assessed in Sprague-Dawley rats. Results obtained in this study have indicated that the designed delivery system has the potential to successfully release disulfiram in a sustained manner for the treatment of alcohol abuse.
{"title":"A nano-enclatherated-gel-composite for the treatment of alcohol abuse and addiction","authors":"F. Mia, Mershen Govender, Sunaina Indermun, Pradeep Kumar, L. D. Toit, Y. Choonara","doi":"10.37819/nanofab.007.198","DOIUrl":"https://doi.org/10.37819/nanofab.007.198","url":null,"abstract":"Alcoholism is a highly prevalent disease, with successful rehabilitation being poor due to irrepressible cravings that result in relapse. This study developed and analysed an intramuscular injection capable of providing a sustained release of disulfiram over one month. Statistically optimized disulfiram-loaded nanomicelles were prepared and incorporated into a thermosensitive gel resulting in a nano-enclatherated-gel-composite (NEGC). The nanomicelle system demonstrated a drug loading capacity and entrapment efficiency of 33.66% and 50.98%, respectively, with a sustained release of 65% of the administered disulfiram achieved after 28 days through the thermosensitive hydrogel. Additionally, ex vivo release studies have been undertaken using rat muscle tissue with in vivo biodistribution, plasma levels, histopathology and myotoxicity following oral disulfiram administration and intramuscular NEGC administration also assessed in Sprague-Dawley rats. Results obtained in this study have indicated that the designed delivery system has the potential to successfully release disulfiram in a sustained manner for the treatment of alcohol abuse.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-09DOI: 10.37819/nanofab.007.193
Iqra Zulfiqar, Abdul Wahab, M. U. Saeed, Nazim Hussain, M. Sabar, M. Bilal, Hafiz M.N. Iqbal
With the exponential rise in infections by CoV-2 and the scarcity of antiviral therapeutics, the development of an effective vaccine for the SARS CoV-2 is critical. The emerging pandemic has prompted the international science community to seek answers in therapeutic agents, including vaccines, to battle the SARS CoV-2. The various scientific literature on SARS CoV, to a lesser degree, MERS (Middle East Respiratory Syndrome), has mentored vaccine techniques for the unique Coronavirus. This disease, COVID-19, is triggered by SARS-CoV-2 virus that causes COVID-19 that needs vaccine protection. Vaccines producing significant amounts of virus-neutralizing antibodies with high affinity may be the only way to combat infection while avoiding negative consequences. There is a summary of numerous vaccine contenders in the review, including nucleotide, vector-based vaccines, & subunit, and attenuated & killed types. That has previously shown preventive effects against the MERS-CoV & SARS-CoV, while suggesting that these candidates may yield a safe and efficient vaccine for SARS-CoV-2. Vector-based vaccines, monoclonal antibodies, genetic vaccines, and protein subunit types for passive immunization are among the vaccination platforms currently being evaluated for the CoV-2 virus; each has its own set of benefits and drawbacks. The clinical safety and effectiveness evidence is the main challenging research task for this possible vaccine developed in the lab. The most challenging aspect of production is constructing and validating distribution platforms worthy of mass-producing the vaccine on a larger scale. Since target vaccine groups include high-risk people above the age of 60, including severe co-morbid diseases, the healthcare staff, and those engaged in vital industries, an effective COVID-19 vaccine would need a careful confirmation of effectiveness and detrimental reactivity. The study summarises efforts devoted to developing an efficient vaccine for the new Coronavirus that devastated the global economy, people's health, and even their lives.
{"title":"Nanoarchitectonics: role of nanomaterials in vaccination strategies for curbing SARs-CoV-2/COVID-19","authors":"Iqra Zulfiqar, Abdul Wahab, M. U. Saeed, Nazim Hussain, M. Sabar, M. Bilal, Hafiz M.N. Iqbal","doi":"10.37819/nanofab.007.193","DOIUrl":"https://doi.org/10.37819/nanofab.007.193","url":null,"abstract":"With the exponential rise in infections by CoV-2 and the scarcity of antiviral therapeutics, the development of an effective vaccine for the SARS CoV-2 is critical. The emerging pandemic has prompted the international science community to seek answers in therapeutic agents, including vaccines, to battle the SARS CoV-2. The various scientific literature on SARS CoV, to a lesser degree, MERS (Middle East Respiratory Syndrome), has mentored vaccine techniques for the unique Coronavirus. This disease, COVID-19, is triggered by SARS-CoV-2 virus that causes COVID-19 that needs vaccine protection. Vaccines producing significant amounts of virus-neutralizing antibodies with high affinity may be the only way to combat infection while avoiding negative consequences. There is a summary of numerous vaccine contenders in the review, including nucleotide, vector-based vaccines, & subunit, and attenuated & killed types. That has previously shown preventive effects against the MERS-CoV & SARS-CoV, while suggesting that these candidates may yield a safe and efficient vaccine for SARS-CoV-2. Vector-based vaccines, monoclonal antibodies, genetic vaccines, and protein subunit types for passive immunization are among the vaccination platforms currently being evaluated for the CoV-2 virus; each has its own set of benefits and drawbacks. The clinical safety and effectiveness evidence is the main challenging research task for this possible vaccine developed in the lab. The most challenging aspect of production is constructing and validating distribution platforms worthy of mass-producing the vaccine on a larger scale. Since target vaccine groups include high-risk people above the age of 60, including severe co-morbid diseases, the healthcare staff, and those engaged in vital industries, an effective COVID-19 vaccine would need a careful confirmation of effectiveness and detrimental reactivity. The study summarises efforts devoted to developing an efficient vaccine for the new Coronavirus that devastated the global economy, people's health, and even their lives.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44326529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-09DOI: 10.37819/nanofab.007.195
Balbir Singh Patial, N. Sharma, S. Bhardwaj, N. Thakur
Nanotechnology started a new era in research and continuous escalations due to its potential applications. In modern optoelectronics, Pb additive nano-chalcogenides are becoming promising materials. For a memory and switching material, the thermal stability and glass-forming ability are vital, and the glass should be thermally stable from a technological point of view. This research article investigates the thermal behaviour of bulk (Se80Te20)94-xGe6Pbx (x = 0, 2, 4 and 6) samples synthesized using the melt quench procedure non-isothermal differential scanning calorimetry at four heating rates from 5 to 20°Cmin-1. Further, the overall crystallization study, which includes thermal stability, ease of glass formation, fragility, glass relaxation and glass-crystallization transformation kinetics of investigated alloys using different empirical formalisms, is reported and discussed. Compositional and heating rate dependence of recorded characteristic temperatures and other deduced parameters of reheated alloys are also discussed. The correlation between deduced parameters is also established to define the utility of these materials in practical applications.
{"title":"Crystallization Study of Pb Additive Se-Te-Ge Nanostructured Alloys using Non-isothermal Differential Scanning Calorimetry","authors":"Balbir Singh Patial, N. Sharma, S. Bhardwaj, N. Thakur","doi":"10.37819/nanofab.007.195","DOIUrl":"https://doi.org/10.37819/nanofab.007.195","url":null,"abstract":"Nanotechnology started a new era in research and continuous escalations due to its potential applications. In modern optoelectronics, Pb additive nano-chalcogenides are becoming promising materials. For a memory and switching material, the thermal stability and glass-forming ability are vital, and the glass should be thermally stable from a technological point of view. This research article investigates the thermal behaviour of bulk (Se80Te20)94-xGe6Pbx (x = 0, 2, 4 and 6) samples synthesized using the melt quench procedure non-isothermal differential scanning calorimetry at four heating rates from 5 to 20°Cmin-1. Further, the overall crystallization study, which includes thermal stability, ease of glass formation, fragility, glass relaxation and glass-crystallization transformation kinetics of investigated alloys using different empirical formalisms, is reported and discussed. Compositional and heating rate dependence of recorded characteristic temperatures and other deduced parameters of reheated alloys are also discussed. The correlation between deduced parameters is also established to define the utility of these materials in practical applications.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47308081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.37819/nanofab.007.186
Naveen Thakur, Anu, K. Kumar, V. Thakur, S. Soni, Ashwani Kumar, S. Samant
Nanoparticles (NPs) are miniature materials ranging from 1 to 100 nm. The NPs have unique chemical and physical properties due to their shape, size and high surface area. This research paper gives a detailed summary of the synthesis, characterization and applications of undoped and (Ag, Fe) co-doped CuO NPs with a diverse concentration of Fe (0.02, 0.04, 0.06 and 0.08 M) at a constant concentration of Ag (0.02 M). X-ray diffractometer (XRD) results revealed average crystallite size of NPs varies in the range 13.10-24.98 nm. Scanning electron microscopy (FE-SEM) showed that the morphology of pure synthesized CuO NPs and Energy dispersive x-ray spectroscopy (EDX) recognized the presence of Ag, Fe elements in the CuO lattice. The particle size obtained by transmission electron microscope (HR-TEM) images was found in the range 19.73-21.47 nm. Cu-O bond stretching of NPs was also confirmed by Fourier Transform Infrared (FTIR) techniques. The values of direct and indirect band gap for CuO were found to be 1.41-1.54 eV and 0.69-1.51 eV respectively. Antibacterial activity for synthesized NPs tested against gram-negative and gram-positive pathogenic bacteria. The photocatalytic properties of synthesized NPs were investigated by monitoring the methyl orange/methylene blue degradation in ultraviolet visible spectroscopy (UV-Vis).
{"title":"Antibacterial and photocatalytic activity of undoped and (Ag, Fe) co-doped CuO nanoparticles via microwave-assisted method","authors":"Naveen Thakur, Anu, K. Kumar, V. Thakur, S. Soni, Ashwani Kumar, S. Samant","doi":"10.37819/nanofab.007.186","DOIUrl":"https://doi.org/10.37819/nanofab.007.186","url":null,"abstract":"Nanoparticles (NPs) are miniature materials ranging from 1 to 100 nm. The NPs have unique chemical and physical properties due to their shape, size and high surface area. This research paper gives a detailed summary of the synthesis, characterization and applications of undoped and (Ag, Fe) co-doped CuO NPs with a diverse concentration of Fe (0.02, 0.04, 0.06 and 0.08 M) at a constant concentration of Ag (0.02 M). X-ray diffractometer (XRD) results revealed average crystallite size of NPs varies in the range 13.10-24.98 nm. Scanning electron microscopy (FE-SEM) showed that the morphology of pure synthesized CuO NPs and Energy dispersive x-ray spectroscopy (EDX) recognized the presence of Ag, Fe elements in the CuO lattice. The particle size obtained by transmission electron microscope (HR-TEM) images was found in the range 19.73-21.47 nm. Cu-O bond stretching of NPs was also confirmed by Fourier Transform Infrared (FTIR) techniques. The values of direct and indirect band gap for CuO were found to be 1.41-1.54 eV and 0.69-1.51 eV respectively. Antibacterial activity for synthesized NPs tested against gram-negative and gram-positive pathogenic bacteria. The photocatalytic properties of synthesized NPs were investigated by monitoring the methyl orange/methylene blue degradation in ultraviolet visible spectroscopy (UV-Vis).","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48543004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.37819/nanofab.007.189
Anita Sudhaik, P. Raizada, A. Khan, Arachana Singh, Pardeep Singh
Upconversion luminescence (UCL) is mainly a nonlinear optical method that some engineered nanomaterials can attain and helps in the transformation of low energy phonons (near-infrared photons) into higher energy phonons (ultraviolet (UV) and visible light photons). Upconversion (UC) nanomaterials are a suitable candidate for preparing near-infrared (NIR) light-responsive photocatalytic systems by mixing with other photocatalysts. Many reports have been published on lanthanide-based UC materials (Ln3+ ions as dopants) and carbon quantum dots (CQDs) carrying UC property with their use in photocatalytic removal of pollutants and energy production. Besides these UC nanomaterials, graphitic carbon nitride (g-C3N4) as a potential photocatalyst (metal-free and ecofriendly) has gained attention owing to its unique and amazing possessions. But some limitations and inadequate utilization of visible light restrict its photocatalytic applicability. Therefore, to enhance or widen its light-harvesting property towards the NIR region, the integration of upconversion nanocrystals (UC NCs) into g-C3N4 is considered an effective approach. Thus, the present review is focused on the amalgamation of g-C3N4 with UC nanomaterials for full solar spectrum absorption in H2 production and pollutant degradation via NIR light absorption.
{"title":"Graphitic carbon nitride-based upconversion photocatalyst for hydrogen production and water purification","authors":"Anita Sudhaik, P. Raizada, A. Khan, Arachana Singh, Pardeep Singh","doi":"10.37819/nanofab.007.189","DOIUrl":"https://doi.org/10.37819/nanofab.007.189","url":null,"abstract":"Upconversion luminescence (UCL) is mainly a nonlinear optical method that some engineered nanomaterials can attain and helps in the transformation of low energy phonons (near-infrared photons) into higher energy phonons (ultraviolet (UV) and visible light photons). Upconversion (UC) nanomaterials are a suitable candidate for preparing near-infrared (NIR) light-responsive photocatalytic systems by mixing with other photocatalysts. Many reports have been published on lanthanide-based UC materials (Ln3+ ions as dopants) and carbon quantum dots (CQDs) carrying UC property with their use in photocatalytic removal of pollutants and energy production. Besides these UC nanomaterials, graphitic carbon nitride (g-C3N4) as a potential photocatalyst (metal-free and ecofriendly) has gained attention owing to its unique and amazing possessions. But some limitations and inadequate utilization of visible light restrict its photocatalytic applicability. Therefore, to enhance or widen its light-harvesting property towards the NIR region, the integration of upconversion nanocrystals (UC NCs) into g-C3N4 is considered an effective approach. Thus, the present review is focused on the amalgamation of g-C3N4 with UC nanomaterials for full solar spectrum absorption in H2 production and pollutant degradation via NIR light absorption.\u0000 ","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48888064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-06DOI: 10.37819/nanofab.007.192
Somya Sinha, Belay Zeleke Sibuh, A. Mishra, Kumud Pant, S. Tomar, Jigisha Anand, P. Gupta
In the present study, the silver (Ag) nanoparticles (NPs) were fabricated using pakhoi (p), a traditional alcoholic beverage popularly used in the Garhwal region of Uttarakhand that has been known to possess significant antimicrobial activity properties. Different physicochemical techniques were used to characterize p-Ag NPs. The results confirm the synthesis of crystalline p-Ag NPs having a nearly spherical shape with a net positive charge. Further, p-Ag NPs exhibit strong antibacterial activity against Gram -ve bacteria. Moreover, a detailed study will be beneficial to understanding and exploiting the biomedical application and environmental remediation activity of the p-Ag NPs.
{"title":"Synthesis, Characterization, and Remedial Action of Biogenic p-Ag Nanoparticles","authors":"Somya Sinha, Belay Zeleke Sibuh, A. Mishra, Kumud Pant, S. Tomar, Jigisha Anand, P. Gupta","doi":"10.37819/nanofab.007.192","DOIUrl":"https://doi.org/10.37819/nanofab.007.192","url":null,"abstract":"In the present study, the silver (Ag) nanoparticles (NPs) were fabricated using pakhoi (p), a traditional alcoholic beverage popularly used in the Garhwal region of Uttarakhand that has been known to possess significant antimicrobial activity properties. Different physicochemical techniques were used to characterize p-Ag NPs. The results confirm the synthesis of crystalline p-Ag NPs having a nearly spherical shape with a net positive charge. Further, p-Ag NPs exhibit strong antibacterial activity against Gram -ve bacteria. Moreover, a detailed study will be beneficial to understanding and exploiting the biomedical application and environmental remediation activity of the p-Ag NPs.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45357523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-19DOI: 10.37819/nanofab.007.190
D. Rana, N. Thakur, S. Thakur, Dilbag Singh
In this paper, MoS2 nanostructure was synthesized by using ammonium molybdate and thiourea as precursors through annealing in a tube furnace. The nanostructure was characterized for morphological, structural and elemental composition by using a field emission scanning electron microscope (FESEM), powder X-ray diffraction and energy-dispersive X-ray spectroscopy (EDS). The as-synthesized nanostructure was then immobilized on the gold electrode (working electrode) for the electrochemical detection of hydrazine. Cyclic voltammogram shows an intense peak at 22 µA, which proved the high electrocatalytic ability of the sensor. The strong electrocatalytic activity regarding the oxidation of hydrazine is ascribed to good electron transfer ability and high surface area of the nanoparticles. Further, the chronoamperometric study was conducted to estimate the sensitivity and the detection limit of the sensor. The sensor exhibited a detection limit and sensitivity of 196 nM and 5.71 µA/µM cm2 respectively. Promising results such as high electrical conductivity, lower detection limit and high sensitivity of the as-synthesized MoS2 nanostructure have proved its potential towards the electrochemical detection of hydrazine.
{"title":"Electrochemical determination of hydrazine by using MoS2 nanostructure modified gold electrode","authors":"D. Rana, N. Thakur, S. Thakur, Dilbag Singh","doi":"10.37819/nanofab.007.190","DOIUrl":"https://doi.org/10.37819/nanofab.007.190","url":null,"abstract":"In this paper, MoS2 nanostructure was synthesized by using ammonium molybdate and thiourea as precursors through annealing in a tube furnace. The nanostructure was characterized for morphological, structural and elemental composition by using a field emission scanning electron microscope (FESEM), powder X-ray diffraction and energy-dispersive X-ray spectroscopy (EDS). The as-synthesized nanostructure was then immobilized on the gold electrode (working electrode) for the electrochemical detection of hydrazine. Cyclic voltammogram shows an intense peak at 22 µA, which proved the high electrocatalytic ability of the sensor. The strong electrocatalytic activity regarding the oxidation of hydrazine is ascribed to good electron transfer ability and high surface area of the nanoparticles. Further, the chronoamperometric study was conducted to estimate the sensitivity and the detection limit of the sensor. The sensor exhibited a detection limit and sensitivity of 196 nM and 5.71 µA/µM cm2 respectively. Promising results such as high electrical conductivity, lower detection limit and high sensitivity of the as-synthesized MoS2 nanostructure have proved its potential towards the electrochemical detection of hydrazine.","PeriodicalId":51992,"journal":{"name":"Nanofabrication","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47820033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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