Pub Date : 2022-10-25DOI: 10.1088/2399-1984/ac9d78
Pavar Sai Kumar, Paul A. Advincula, S. Goel
Graphene-based materials are excellent acceptors of the CRET phenomenon. Due to the presence of π -conjugated planar structure, these materials were reported to quench the chemiluminescence (CL) signal. Based on this fact, herein, for the first time, the recovery of quenched CL signal from different graphene-based materials is successfully obtained through the catalytic activity of onsite temperature. The maximum recovery of a quenched signal at an optimum temperature of 70 ∘C was 1440% from the 10 mg ml−1 reduced graphene oxide paper analytical devices. The recovery of flash graphene and laser induced graphene materials were found to be 895% and 521%, respectively, for the same conditions via the generation of π -conjugated carbon radicals. Catechin, an antioxidant, was analyzed from 0.1 nM to 500 nM to interpret the generation of carbon radicals from graphenized materials. The proposed smartphone-enabled onsite heating recovery model was validated with the lower limit of 94 pM (27.3 pg ml−1) of catechin concentration without advanced photodiodes or instrumentation. The validation was performed in real samples of green tea (1 and 2). This method of CL recovery can be a future model for indicating the purity of graphene-based materials without using advanced instrumentations.
{"title":"First report on onsite temperature based recovery of quenched chemiluminescence signal from graphenized μPADs: validation by catechins radical scavenging","authors":"Pavar Sai Kumar, Paul A. Advincula, S. Goel","doi":"10.1088/2399-1984/ac9d78","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9d78","url":null,"abstract":"Graphene-based materials are excellent acceptors of the CRET phenomenon. Due to the presence of π -conjugated planar structure, these materials were reported to quench the chemiluminescence (CL) signal. Based on this fact, herein, for the first time, the recovery of quenched CL signal from different graphene-based materials is successfully obtained through the catalytic activity of onsite temperature. The maximum recovery of a quenched signal at an optimum temperature of 70 ∘C was 1440% from the 10 mg ml−1 reduced graphene oxide paper analytical devices. The recovery of flash graphene and laser induced graphene materials were found to be 895% and 521%, respectively, for the same conditions via the generation of π -conjugated carbon radicals. Catechin, an antioxidant, was analyzed from 0.1 nM to 500 nM to interpret the generation of carbon radicals from graphenized materials. The proposed smartphone-enabled onsite heating recovery model was validated with the lower limit of 94 pM (27.3 pg ml−1) of catechin concentration without advanced photodiodes or instrumentation. The validation was performed in real samples of green tea (1 and 2). This method of CL recovery can be a future model for indicating the purity of graphene-based materials without using advanced instrumentations.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47654687","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 : 2022-10-24DOI: 10.1088/2399-1984/ac9d12
D. K. Mohapatra, M. Sahoo, S. Praharaj, D. Rout
The development of novel nanostructured composites is of current interest for applications as electrode materials. In this regard, an attempt has been made to synthesize NiCo2O4@V2O5 nanocomposite and compare its charge storage performance with pristine NiCo2O4 nanoparticles. High-resolution scanning electron microscope micrographs reveal a mesoporous nanobelt like morphology of the nanocomposite with a Brunauer–Emmett–Teller surface area of ∼65 m2 g−1 and average mesopore size centered on ∼7.55 nm. Electrochemical measurements performed on both samples anticipate capacitive behavior with quasi-reversible redox reactions. However, NiCo2O4@V2O5 is found to demonstrate a strikingly high specific capacity of 194 mAh g−1 at 1 A g−1 along with a notable capacity retention of ∼90%, even after 3000 charge–discharge cycles, and a Coulombic efficiency >97% at 5 A g−1. These features are much superior to the properties of pristine NiCo2O4 nanoparticles. The results obtained in this work ascertain the functional robustness of NiCo2O4@V2O5 nanocomposites as electrode materials in supercapacitors.
{"title":"NiCo2O4@V2O5 nanobelts as electrode materials for efficient electrochemical charge storage","authors":"D. K. Mohapatra, M. Sahoo, S. Praharaj, D. Rout","doi":"10.1088/2399-1984/ac9d12","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9d12","url":null,"abstract":"The development of novel nanostructured composites is of current interest for applications as electrode materials. In this regard, an attempt has been made to synthesize NiCo2O4@V2O5 nanocomposite and compare its charge storage performance with pristine NiCo2O4 nanoparticles. High-resolution scanning electron microscope micrographs reveal a mesoporous nanobelt like morphology of the nanocomposite with a Brunauer–Emmett–Teller surface area of ∼65 m2 g−1 and average mesopore size centered on ∼7.55 nm. Electrochemical measurements performed on both samples anticipate capacitive behavior with quasi-reversible redox reactions. However, NiCo2O4@V2O5 is found to demonstrate a strikingly high specific capacity of 194 mAh g−1 at 1 A g−1 along with a notable capacity retention of ∼90%, even after 3000 charge–discharge cycles, and a Coulombic efficiency >97% at 5 A g−1. These features are much superior to the properties of pristine NiCo2O4 nanoparticles. The results obtained in this work ascertain the functional robustness of NiCo2O4@V2O5 nanocomposites as electrode materials in supercapacitors.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43056285","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}
A cathode with single-crystal structure for Li-ion batteries is shown to provide stable cycle performance because of its integrated crystal structure and smaller internal stress. Here, Na+ ions with larger radius are doped into LiNi1/3Co1/3Mn1/3O2 (LNCMO) single-crystal nanoparticles through a simple sol–gel method to further improve the rate capability. Different amounts of Na doping are considered to illustrate the cooperative effect of single-crystal structure and Na doping. The results indicate that a Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 cathode has a discharge capacity of 193.7 mAh g–1 at 0.2 C, much higher than the 174.8 mAh g–1 of its undoped counterpart. After 50 cycles, the capacity retention is enhanced from 71.3% for undoped LNCMO to 89.2% for Li0.9Na0.1Ni1/3Co1/3Mn1/3O2. At the same time, Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 delivers a discharge capacity of 137.9 mAh g–1 at 10 C, about twice the capacity of LNCMO. Na ions doped into the lattice can magnify the distances between lithium layers and act as pins for more stable structure and faster kinetics of Li+-ion diffusion.
单晶结构的锂离子电池阴极由于具有完整的晶体结构和较小的内应力，具有稳定的循环性能。本文通过简单的溶胶-凝胶法将半径较大的Na+离子掺杂到LiNi1/3Co1/3Mn1/3O2 (LNCMO)单晶纳米颗粒中，进一步提高了速率能力。为了说明单晶结构与钠掺杂的协同效应，考虑了不同钠掺杂量。结果表明，在0.2℃下，Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的放电容量为193.7 mAh g-1，远高于未掺杂Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的174.8 mAh g-1。循环50次后，未掺杂LNCMO的容量保持率从71.3%提高到Li0.9Na0.1Ni1/3Co1/3Mn1/3O2的89.2%。同时，Li0.9Na0.1Ni1/3Co1/3Mn1/3O2在10℃下的放电容量为137.9 mAh g-1，约为LNCMO的两倍。在晶格中掺入Na离子可以放大锂层之间的距离，并作为引脚，使结构更稳定，Li+离子扩散动力学更快。
{"title":"The effect of Na doping on layered LiNi1/3Co1/3Mn1/3O2 single-crystal structure as a cathode for lithium-ion batteries","authors":"Dongsheng Yu, Jili Li, Zhiyu Min, Chunjuan Tang, Peiguo Meng, Baotai Chen","doi":"10.1088/2399-1984/ac9bb0","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9bb0","url":null,"abstract":"A cathode with single-crystal structure for Li-ion batteries is shown to provide stable cycle performance because of its integrated crystal structure and smaller internal stress. Here, Na+ ions with larger radius are doped into LiNi1/3Co1/3Mn1/3O2 (LNCMO) single-crystal nanoparticles through a simple sol–gel method to further improve the rate capability. Different amounts of Na doping are considered to illustrate the cooperative effect of single-crystal structure and Na doping. The results indicate that a Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 cathode has a discharge capacity of 193.7 mAh g–1 at 0.2 C, much higher than the 174.8 mAh g–1 of its undoped counterpart. After 50 cycles, the capacity retention is enhanced from 71.3% for undoped LNCMO to 89.2% for Li0.9Na0.1Ni1/3Co1/3Mn1/3O2. At the same time, Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 delivers a discharge capacity of 137.9 mAh g–1 at 10 C, about twice the capacity of LNCMO. Na ions doped into the lattice can magnify the distances between lithium layers and act as pins for more stable structure and faster kinetics of Li+-ion diffusion.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":"6 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41664021","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 : 2022-10-13DOI: 10.1088/2399-1984/ac9a19
Samin Naghash-Hamed, N. Arsalani, Seyed Borhan Mousavi
Para-nitroaniline (PNA) and ortho-nitroaniline (ONA) are highly toxic contaminants in aqueous solution and must be treated. In the current investigation, novel magnetic nanocomposites containing copper ferrite (CuFe2O4) and gelatin-derived carbon quantum dots (CQDs) were successfully synthesized. The prepared nanocatalyst was characterized by scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Brunauer–Emmet–Teller (BET), Fourier transform infrared and ultraviolet–visible techniques. The mesoporous structure of the CuFe2O4/CQD nanocomposite was shown using the BET/Barrett–Joyner–Halenda technique. The catalytic performance of the nanocatalyst during the reduction of PNA and ONA was assessed in an aqueous medium at 25 °C. The complete reduction of PNA and ONA using the CuFe2O2/CQDs nanocomposite occurred in 13 s and 35 s, respectively. The pseudo-second-order rate constant (K app) was obtained as 2.89 × 10−1 s−1 and 9.3 × 10−2 s−1 for reducing PNA and ONA, respectively. Moreover, the magnetic nanocatalyst was easily separated from the reaction solution and recycled for up to six consecutive cycles without significant loss of catalytic activity.
{"title":"Facile copper ferrite/carbon quantum dot magnetic nanocomposite as an effective nanocatalyst for reduction of para-nitroaniline and ortho-nitroaniline","authors":"Samin Naghash-Hamed, N. Arsalani, Seyed Borhan Mousavi","doi":"10.1088/2399-1984/ac9a19","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9a19","url":null,"abstract":"Para-nitroaniline (PNA) and ortho-nitroaniline (ONA) are highly toxic contaminants in aqueous solution and must be treated. In the current investigation, novel magnetic nanocomposites containing copper ferrite (CuFe2O4) and gelatin-derived carbon quantum dots (CQDs) were successfully synthesized. The prepared nanocatalyst was characterized by scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Brunauer–Emmet–Teller (BET), Fourier transform infrared and ultraviolet–visible techniques. The mesoporous structure of the CuFe2O4/CQD nanocomposite was shown using the BET/Barrett–Joyner–Halenda technique. The catalytic performance of the nanocatalyst during the reduction of PNA and ONA was assessed in an aqueous medium at 25 °C. The complete reduction of PNA and ONA using the CuFe2O2/CQDs nanocomposite occurred in 13 s and 35 s, respectively. The pseudo-second-order rate constant (K app) was obtained as 2.89 × 10−1 s−1 and 9.3 × 10−2 s−1 for reducing PNA and ONA, respectively. Moreover, the magnetic nanocatalyst was easily separated from the reaction solution and recycled for up to six consecutive cycles without significant loss of catalytic activity.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43238137","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 : 2022-09-27DOI: 10.1088/2399-1984/ac9568
Handong Jin, Shihe Yang, M. Iqbal, Yu-Jia Zeng
Radiation detection, converting high-energy (keV) photons to lower energy (1.7–3 eV) photons, is of great importance in various fields, including medical diagnostics, quality inspection, and security checking. High-resolution scintillation imaging based on lead halide perovskite nanocrystals is very promising for these applications owing to their high absorption cross-section for x-rays, fast decay time, room temperature fabrication, tunable bandgap, low trap density, and near-unity photoluminescence quantum yield. Although considerable achievements have been made, challenges remain for future industrialization. Herein, the progress of scintillators based on lead halide perovskite nanocrystals is reviewed, including their working mechanisms, key parameters, and the relationship between growth conditions and performance. An overview of the current state in this promising research area toward high-performance x-ray scintillators is provided, along with a look at some of the challenges and opportunities that lie ahead.
{"title":"Metal halide perovskite nanocrystals for x-ray scintillators","authors":"Handong Jin, Shihe Yang, M. Iqbal, Yu-Jia Zeng","doi":"10.1088/2399-1984/ac9568","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9568","url":null,"abstract":"Radiation detection, converting high-energy (keV) photons to lower energy (1.7–3 eV) photons, is of great importance in various fields, including medical diagnostics, quality inspection, and security checking. High-resolution scintillation imaging based on lead halide perovskite nanocrystals is very promising for these applications owing to their high absorption cross-section for x-rays, fast decay time, room temperature fabrication, tunable bandgap, low trap density, and near-unity photoluminescence quantum yield. Although considerable achievements have been made, challenges remain for future industrialization. Herein, the progress of scintillators based on lead halide perovskite nanocrystals is reviewed, including their working mechanisms, key parameters, and the relationship between growth conditions and performance. An overview of the current state in this promising research area toward high-performance x-ray scintillators is provided, along with a look at some of the challenges and opportunities that lie ahead.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47132759","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 : 2022-09-19DOI: 10.1088/2399-1984/ac92f1
M. Arruebo
The management of skin and soft-tissue infections represents a burden for healthcare systems worldwide, demanding additional scientific efforts. Despite combined advances in modern medicine from different disciplines, chronic non-healing topical wounds still represent an unresolved clinical challenge. Nanotechnology has contributed significantly to the development of advanced therapeutic and diagnostic approaches in wound care. From this perspective, recommendations on the design of nano-based approaches for the management of infected non-healing chronic wounds are suggested. Preclinical results have demonstrated that nanostructured antimicrobial-loaded dressings and hydrogels can reduce the pathogenic bioburden and can restore the wound’s physiological balance. Future clinical trials that ensure meaningful results are recommended.
{"title":"Opportunities and challenges for antimicrobial nanostructured materials in the management of skin infections","authors":"M. Arruebo","doi":"10.1088/2399-1984/ac92f1","DOIUrl":"https://doi.org/10.1088/2399-1984/ac92f1","url":null,"abstract":"The management of skin and soft-tissue infections represents a burden for healthcare systems worldwide, demanding additional scientific efforts. Despite combined advances in modern medicine from different disciplines, chronic non-healing topical wounds still represent an unresolved clinical challenge. Nanotechnology has contributed significantly to the development of advanced therapeutic and diagnostic approaches in wound care. From this perspective, recommendations on the design of nano-based approaches for the management of infected non-healing chronic wounds are suggested. Preclinical results have demonstrated that nanostructured antimicrobial-loaded dressings and hydrogels can reduce the pathogenic bioburden and can restore the wound’s physiological balance. Future clinical trials that ensure meaningful results are recommended.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44606875","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 : 2022-09-07DOI: 10.1088/2399-1984/ac9022
Yichuan Guo, Zizhen Gong, Hang Yu, Guihua Liu, Zisheng Zhang, Changcheng Wu, Jingde Li
Efficient electrocatalysts are critical for the oxygen evolution reaction (OER) that occurs during water electrolysis. Herein, a simple and low-cost strategy of assembling CoNi nanowire arrays with NiFe nanosheets on flexible carbon cloth (CC) support as an efficient OER catalyst is developed. This unique ‘nanosheets on nanowires’ structure design increases its specific surface area, enabling access to more active sites. The resulting NiFe@H-CoNi/CC catalyst exhibits excellent OER activity (280 mV overpotential at 100 mA cm−2) with a Tafel slope of 36 mV dec−1 and also has outstanding durability at high current operation conditions (over 100 h at 100 mA cm−2). Moreover, in-situ Raman analysis suggests that the NiOOH is the realistic OER active phase. This ‘nanosheet on nanowire’ design gives a means for fabricating OER catalysts that are both high-performance and long-lasting.
高效的电催化剂是水电解过程中析氧反应(OER)的关键。本文提出了一种简单、低成本的方法，将ni纳米线阵列与NiFe纳米片组装在柔性碳布(CC)载体上，作为高效的OER催化剂。这种独特的“纳米片纳米线”结构设计增加了其比表面积，使其能够接触到更多的活性位点。所得NiFe@H-CoNi/CC催化剂表现出优异的OER活性(过电位为280 mV，过电位为100 mA cm−2)，Tafel斜率为36 mV dec−1，并且在高电流操作条件下具有出色的耐久性(100 mA cm−2下超过100小时)。此外，原位拉曼分析表明NiOOH是真实的OER活性相。这种“纳米片纳米线”的设计为制造高性能和持久的OER催化剂提供了一种方法。
{"title":"Layer-structured NiFe nanosheets on CoNi nanowires for enhanced oxygen evolution reaction","authors":"Yichuan Guo, Zizhen Gong, Hang Yu, Guihua Liu, Zisheng Zhang, Changcheng Wu, Jingde Li","doi":"10.1088/2399-1984/ac9022","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9022","url":null,"abstract":"Efficient electrocatalysts are critical for the oxygen evolution reaction (OER) that occurs during water electrolysis. Herein, a simple and low-cost strategy of assembling CoNi nanowire arrays with NiFe nanosheets on flexible carbon cloth (CC) support as an efficient OER catalyst is developed. This unique ‘nanosheets on nanowires’ structure design increases its specific surface area, enabling access to more active sites. The resulting NiFe@H-CoNi/CC catalyst exhibits excellent OER activity (280 mV overpotential at 100 mA cm−2) with a Tafel slope of 36 mV dec−1 and also has outstanding durability at high current operation conditions (over 100 h at 100 mA cm−2). Moreover, in-situ Raman analysis suggests that the NiOOH is the realistic OER active phase. This ‘nanosheet on nanowire’ design gives a means for fabricating OER catalysts that are both high-performance and long-lasting.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44178562","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 : 2022-08-30DOI: 10.1088/2399-1984/ac8dce
Rongpeng Fang, Zhenshan Yu, Yu‐Sheng Lin
Plasmonic structures based on metamaterials are widely studied and have been extensively researched in various applications. However, the fabrication of regular nanostructures always requires expensive equipment and a strict working environment, lacking the ability for large-scale fabrication. In this study, we propose and demonstrate simple nanotextured nickel (Ni) dewetting thin films on silicon (Si) and quartz substrates by using different thermal annealing temperatures. They achieve a broadband absorption range with near zero reflectivity due to the standing-wave resonances of surface plasmon polariton, and the resonance is relative to the material of the substrate. The topographies of the nanotextured Ni dewetting thin films vary with thermal annealing temperatures at different dewetting stages. The corresponding reflection and absorption resonant wavelengths of the devices are redshifted by increasing the thermal annealing temperatures. The main absorption resonances are at wavelengths of 610 nm, 580 nm, 625 nm, and 660 nm on the Si substrate. While the reflectivity of the sample around the visible range is lower than 40%, it is suitable for broadband absorption for green and yellow spectra. Moreover, the resonant wavelengths are blueshifted by increasing the incident angles. The demonstrated devices are also sensitive to the ambient media. The reflection resonant wavelengths are redshifted by increasing the environmental refraction indexes. The corresponding reflected colors are changed from green to yellow . These devices exhibit a highest sensitivity of 500 nm RIU−1 and can be used for color sensors. This proposed approach has large-scale fabrication capacity and provides promising applications for broadband absorbers, reflective displays, environmental sensors, and other optoelectronic fields.
{"title":"Lithography-free fabrication and optical characterizations of nanotextured nickel dewetting thin film for broadband absorbers","authors":"Rongpeng Fang, Zhenshan Yu, Yu‐Sheng Lin","doi":"10.1088/2399-1984/ac8dce","DOIUrl":"https://doi.org/10.1088/2399-1984/ac8dce","url":null,"abstract":"Plasmonic structures based on metamaterials are widely studied and have been extensively researched in various applications. However, the fabrication of regular nanostructures always requires expensive equipment and a strict working environment, lacking the ability for large-scale fabrication. In this study, we propose and demonstrate simple nanotextured nickel (Ni) dewetting thin films on silicon (Si) and quartz substrates by using different thermal annealing temperatures. They achieve a broadband absorption range with near zero reflectivity due to the standing-wave resonances of surface plasmon polariton, and the resonance is relative to the material of the substrate. The topographies of the nanotextured Ni dewetting thin films vary with thermal annealing temperatures at different dewetting stages. The corresponding reflection and absorption resonant wavelengths of the devices are redshifted by increasing the thermal annealing temperatures. The main absorption resonances are at wavelengths of 610 nm, 580 nm, 625 nm, and 660 nm on the Si substrate. While the reflectivity of the sample around the visible range is lower than 40%, it is suitable for broadband absorption for green and yellow spectra. Moreover, the resonant wavelengths are blueshifted by increasing the incident angles. The demonstrated devices are also sensitive to the ambient media. The reflection resonant wavelengths are redshifted by increasing the environmental refraction indexes. The corresponding reflected colors are changed from green to yellow . These devices exhibit a highest sensitivity of 500 nm RIU−1 and can be used for color sensors. This proposed approach has large-scale fabrication capacity and provides promising applications for broadband absorbers, reflective displays, environmental sensors, and other optoelectronic fields.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48328655","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 : 2022-07-27DOI: 10.1088/2399-1984/ac84b5
Bo-Ting Huang, Yanqiong Li, Wen Zeng
In recent years, metal organic frameworks (MOFs) have become emerging materials. Their applications in various fields are increasingly reported due to their special structure and excellent physical and chemical properties. Zeolitic imidazolate framework (ZIF) is a sub-system of MOF with good stability and similar structure to conventional type of zeolites. A variety of ZIF crystals have been obtained by adjusting metal ions as well as organic ligands. Through investigation, we found that the literature on gas sensing mainly focuses on the complexes of ZIF-8 and derivatives of ZIF-67, and there were also some reports on the application of other ZIF materials in gas response. In this paper, the reports of ZIF materials in the direction of gas sensing in recent years are summarized. By summarizing and considering the existing studies, it can help us better understand the current progress and limitations of ZIF materials in the development of gas sensing, and provide some possible development directions or ideas for the future development of ZIF materials.
{"title":"Application status of zeolitic imidazolate framework in gas sensors","authors":"Bo-Ting Huang, Yanqiong Li, Wen Zeng","doi":"10.1088/2399-1984/ac84b5","DOIUrl":"https://doi.org/10.1088/2399-1984/ac84b5","url":null,"abstract":"In recent years, metal organic frameworks (MOFs) have become emerging materials. Their applications in various fields are increasingly reported due to their special structure and excellent physical and chemical properties. Zeolitic imidazolate framework (ZIF) is a sub-system of MOF with good stability and similar structure to conventional type of zeolites. A variety of ZIF crystals have been obtained by adjusting metal ions as well as organic ligands. Through investigation, we found that the literature on gas sensing mainly focuses on the complexes of ZIF-8 and derivatives of ZIF-67, and there were also some reports on the application of other ZIF materials in gas response. In this paper, the reports of ZIF materials in the direction of gas sensing in recent years are summarized. By summarizing and considering the existing studies, it can help us better understand the current progress and limitations of ZIF materials in the development of gas sensing, and provide some possible development directions or ideas for the future development of ZIF materials.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47545289","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 : 2022-07-26DOI: 10.1088/2399-1984/ac8460
Parisa Salarizadeh, Mohadese Rastgoo-Deylami, M. Askari, Khadijeh Hooshyari
Introducing suitable electrode materials and electrolytes for supercapacitors and next-generation batteries should be considered for the industrial application of these devices. Among the proposed materials for them, transition metal chalcogenides (TMCs), are attractive and efficient options due to their unique properties such as appropriate layered structure, good oxidation state of transition metals, high thermal and mechanical stabilities, etc. However, applying other layered materials with high electrical conductivity e.g. carbon-based materials can lead to producing remarkable results for the mentioned applications. However, an interesting point is how making TMCs composite with different types of carbon materials leads to improve electrochemical and structural properties of TMCs as active materials. In the present short review, the structural and electrochemical improvements of different types of TMC composites with carbon-based materials and their mechanism are investigated for supercapacitors and next-generation rechargeable batteries.
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