Nano Research
·
2017
·Vol. 11
·期 2
·1004-1017
·
IF 7.354
Wu Tianxing,Zhu Xiaoguang,Wang Guozhong,Zhang Yunxia,Zhang Haimin,Zhao Huijun
Electrocatalytic synthesis of value-added chemicals is attracting significant research attention owing to its mild reaction conditions, environmental benignity, and potentially scalable application to organic synthetic chemistry. Herein, we report the preparation of a single-crystalline NiS 2 nanostructure film of ∼ 50 nm thickness grown directly on a carbon fiber cloth (NiS 2 /CFC) by a facile vapor-phase hydrothermal (VPH) method. NiS 2 /CFC as an electrocatalyst exhibits activity for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in alkaline media. Furthermore, a series of alcohols (2-propanol, 2-butanol, 2-pentanol, and cyclohexanol) were electrocatalytically converted to the corresponding ketones with high selectivity, efficiency, and durability using the NiS 2 /CFC electrode in alkaline media. In the presence of 0.45 M alcohol, a remarkably decreased overpotential (∼ 150 mV, vs. RHE) at the NiS 2 /CFC anode compared with that for water oxidation to generate O 2 , i.e., the OER, in alkaline media leads to significantly improved H 2 generation. For instance, the H 2 generation rate in the presence of 0.45 M 2-propanol is almost 1.2-times of that obtained for pure water splitting, but in a system that employs an applied voltage at least 280 mV lower than that required for water splitting to achieve the same current density (20 mA·cm –2 ). Thus, our results demonstrate the applicability of our bifunctional non-precious-metal electrocatalyst for organic synthesis and simultaneous H 2 production.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2025
·
IF 4.5
Li Lai,Muqiu Xia,Mengyu Fu,Yuanyuan Gao,Jiahao Sun,Guangzhou Liu,Shiqiang Chen
A micro-nano sharkskin like film (Cu-MNS-FA) was synthesized on copper surface through chemical etching followed by formate passivation, and its anticorrosive, antibacterial and thermal conductivity properties were investigated. Results show that after 7 d of exposure to nature, Pseudomonas aeruginosa and Desulfovibrio vulgaris seawater, the charge transfer resistance of Cu-MNS-FA is more than three times higher than that of unmodified copper. In particular, in D. vulgaris seawater, the R ct value of modified copper is 7 times higher than that of unmodified copper after the same exposure duration. The counts of sessile cells, specifically P. aeruginosa and D. vulgaris , on the surface of modified copper are reduced by more than 88 % after 3 days of immersion. Furthermore, thermal conductivity remains 10 % higher than that of untreated copper after 7 d of immersion. This film improves the performance characteristics of copper in seawater heat exchange systems.
研究领域:
材料科学
·
微生物学
·
海洋工程
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产品关联
DOI
PubMed
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2020
·Vol. 15
·期 10
·1177-1183
·
IF 0.771
Lin Han,Jia Pengde,Natarajan Satheesh,Ding Caiping,Guo Zhiyong,Huang Youju
The development of new electrocatalysts with high activity and oxidation stability for fuel cells is an emerging challenge for the development of advocate clean energy. However, most reports focus on the catalytic reaction path and improved stability by using bimetallic or trimetallic
alloys. That undoubtedly increases its cost of catalysis and limits commercial applications. Herein, we have developed a universal strategy to construct a two-dimensional large-area hollow platinum supra-nanostructures film through a sacrificial template method. The obtained platinum supra-nanostructure
film exhibits high catalytic activity and excellent durability for the electrooxidation of ethanol and methanol, owing to its unique ultra-thin hollow structure and interparticle synergistic effects of platinum supra-nanostructure array, which would effectively improve the atom utilization
rate and the electron transfer rate. The platinum supra-nanostructures film with the thickness of 6 nm was the most prominent for the methanol catalytic reaction, showed a mass-normalized activity of 116.67 mA mg−1, which was higher than the values of most reports. The film
also had outstanding cycle stability with more than 200 CV cycles. The constructed platinum supra-nanostructures film is a promising candidate as high-performance electrocatalysts for fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Anan Xu,Jishun Li,Shenglan Zhang,Hongcheng Pan
Immunochromatographic test strips typically consist of sample pad, conjugate pad, nitrocellulose membrane, and absorbent pad. Even minute variations in the assembly of these components can lead to inconsistent sample-reagent interactions, thereby reducing reproducibility. In addition, the nitrocellulose membrane is susceptible to damage during assembly and handling. To address this issue, we propose to replace the sample pad, conjugate pad, and nitrocellulose membrane with hierarchical dendritic gold nanostructure (HD-nanoAu) films to develop a compact integrated immunochromatographic strip. The strip uses quantum dots as a background fluorescence signal and employs fluorescence quenching to detect C-reactive protein (CRP) in human serum. A 5.9 μm thick HD-nanoAu film was electrodeposited on an ITO conductive glass by the constant potential method. The wicking kinetics of the HD-nanoAu film was thoroughly investigated, and the results indicated that the film exhibited favorable wicking properties, with a wicking coefficient of 0.72 μm ms −0.5 . The immunochromatographic device was fabricated by etching three interconnected rings on HD-nanoAu/ITO to designate sample/conjugate (S/C), test (T), and control (C) regions. The S/C region was immobilized with mouse anti-human CRP antibody (Ab1) labeled with gold nanoparticles (AuNPs), while the T region was preloaded with polystyrene microspheres decorated with CdSe@ZnS quantum dots (QDs) as background fluorescent material, followed by mouse anti-human CRP antibody (Ab2). The C region was immobilized with goat anti-mouse IgG antibody. After the samples were added to the S/C region, the excellent wicking properties of the HD-nanoAu film facilitated the lateral flow of the CRP-containing sample toward the T and C regions after binding to AuNPs labeled with CRP Ab1. In the T region, CRP-AuNPs-Ab1 formed sandwich immunocomplexes with Ab2, and the fluorescence of QDs was quenched by AuNPs. The ratio of fluorescence intensity in the T region to that in the C region was used to quantify CRP. The T/C fluorescence intensity ratio was negatively correlated with the CRP concentration in the range of 26.67–853.33 ng mL −1 (corresponding to 300-fold diluted human serum), with a correlation coefficient ( R 2 ) of 0.98. The limit of detection was 15.0 ng mL −1 (corresponding to 300-fold diluted human serum), and the range of relative standard deviation: 4.48–5.31%, with a recovery rate of 98.22–108.33%. Common interfering substances did not cause significant interference, and the range of relative standard deviation: 1.96–5.51%. This device integrates multiple components of conventional immunochromatographic strips onto a single HD-nanoAu film, resulting in a more compact structure that improves the reproducibility and robustness of detection, making it promising for point-of-care testing applications.
研究领域:
医学诊断
·
生物传感
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 38
·16537-16545
·
IF 3.288
Zhaohui Huang,Mengjiao Yi,Yihan Liu,Ping Qi,Aixin Song,Jingcheng Hao
Two polymerizable surfactants with different numbers of double bonds, 3-undecylene-1-vinylimidazolium bromide (C11VIMBr) and 3-dodecyl-1-vinylimidazolium bromide (C12VIMBr), were chosen to prepare magnetic surfactant monomers by introducing Mn2+, Gd3+ and Ho3+. All the surfactant monomers exhibited paramagnetism except for C12VIMMn that exhibited ferromagnetism. The surface activity results indicated that the magnetic counterions tended to reduce the critical micelle concentration (cmc) and increase the dissociation constant of the surfactants, which was attributed to the stronger hydrophobicity of the magnetic anions than that of Br−. Compared with the surfactant monomers with Br− as counterions, these magnetic surfmers showed thermotropic liquid crystal (LC) behaviors within a certain range of temperature. C11VIMMn, C12VIMMn and C12VIMHo could form smectic A (SmA) LC phases whereas C11VIMGd, C11VIMHo and C12VIMGd produced cubic phases with higher viscosity. The magnetic LC films with ordered nanostructures were directly obtained by in situ polymerization of the magnetic surfmers without a significant change of magnetic strength. The magnetic LC films obtained could be attracted and removed by an external magnet, providing a possibility for the development of magnetically responsive solid electrolytes and efficient adsorbents.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yongfeng Zhang,Ruiheng Zhou,Ruiliang Xu,Lulei Fang,Jingran Zhou,Yu Chen,Shengping Ruan
An ultraviolet (UV) photodetector (PD) is an indispensable element in the field of optoelectronics. However, the current PDs often need high driving voltages, which hinder the continued development of the devices. P–n junctions have been used in the construction of self-powered UVPDs. In this work, we fabricated a self-powered UVPD based on the CuI/TiO2 nanostructured film. To investigate the effects of the 80 nm thick CuI film on the device performance, we compared the performance of UVPDs based on the CuI/TiO2 film and TiO2 film. Compared with the TiO2 PD, the CuI/TiO2 PD showed self-powered performance with an on–off ratio of 103 and a peak responsivity of 28 mA W–1 at 330 nm. It is worth noting that the CuI/TiO2 device demonstrated a fast photo-response time of 35 ms and a decay time of 40 ms. The uniform CuI-nanostructured film spin-coated on the TiO2 film constructs a built-in field with the TiO2 film to separate the photogenerated carriers and transport them to both sides of the CuI/TiO2 nanostructured heterojunction, which is the main reason for the self-powered performance of the CuI/TiO2 UVPD. These results provide a feasible means for the development of heterojunction self-powered UVPDs.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiawei Wang,Peng Lu,Yunlong Shuai,Zhanbo Fan,Yunzhe Li,Xinyuan Li,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
A series of CH3NH3PbBr3 (MAPbBr3) nanostructure-based films with various thicknesses on indium-tin-oxide (ITO)-covered substrates were fabricated by the spin-coating technique. The effects of ITO on the structure, surface morphology, and optical properties of MAPbBr3 thin films were investigated, respectively. Compared with monolayer MAPbBr3 thin films, the ITO buffer layer has the effect of improving the crystalline quality and preferential orientation of MAPbBr3 thin films, realizing the transition from reverse saturation absorption to saturation absorption. The tunability of nonlinear optical absorption was achieved by changing the thickness of the MAPbBr3 film. The maximum three-photon absorption coefficient of the monolayer MAPbBr3 film was 7.35 × 10–14 cm3/W2. The maximum third-order nonlinearity coefficient of MAPbBr3/ITO composite film was −1.04 × 10–5 cm/W. In addition, the finite-difference time-domain simulation results were in good agreement with the experimental results. These results indicate that the synthesized MAPbBr3 nanostructure-based films have potential applications in nonlinear optical devices.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ziwei Liu,Chen Cai,Wengang Wu,Xinxia Cai,Zhi-mei Qi
Nanostructured films have been widely used for preparing various advanced thin-film devices because of their unique electrical, optical, and plasmonic characteristics associated with the nano-size effect. In situ, nondestructive and high-resolution characterization of nanostructured films is essential for optimizing thin-film device performance. In this work, such thin-film characterization was achieved using a hyperspectral dark-field microscope (HSDFM) that was constructed in our laboratory by integrating a hyperspectral imager with a commercial microscope. The HSDFM allows for high-resolution (Δλ = 0.4 nm) spectral analysis of nanostructured samples in the visible-near-infrared region with a spatial resolution as high as 45 nm × 45 nm (corresponding to a single pixel). Four typical samples were investigated with the HSDFM, including the gold nanoplate array, the self-assembled gold nanoparticle (GNP) sub-monolayer, the sol-gel nanoporous titanium dioxide (TiO2) film, and the layer-stacked molybdenum disulfide (MoS2) sheet. According to the experimental results, the plasmon resonance scattering bands for nanoplate clusters are identical with those for individual gold nanoplates, indicating that the gap between adjacent nanoplates is too large to allow plasmonic coupling between them. A different case was observed with the self-assembled GNP sub-monolayer in which the aggregated clusters with the internal plasmonic interaction show a considerable red-shift of the plasmon resonance band relative to the isolated single GNP. In addition, the protein adsorption on the nanoporous TiO2 film was observed to be inhomogeneous on the microscale, and the stepped boundaries of the MoS2 sheet were clearly observed. A quasi-linear dependence of the single-pixel light intensity on the step height was obtained by combining the HSDFM with atomic force microscopy. The minimum thickness detectable by the present HSDFM is 6.5 nm, corresponding to the 10-layer MoS2 film. The work demonstrated the outstanding applicability of the HSDFM for nanostructured film characterization.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2023
·
IF 9.9
Wang Chao-Peng,Sun Hao,Bian Gang,Wang Jia-Xi,Pang Xixi,Wang Guoqi,Zhu Jian,Bu Xian-He
Active sites of two-dimensional (2D) electrocatalysts are often partially blocked owing to their inevitable stacking and hydrophobic polymeric binders in macroscale electrodes, therefore impeding their applications in efficient electrolyzers. Here, using layered double hydroxide (LDH) nanosheets as a model 2D electrocatalyst, we demonstrate that their performance toward water splitting can be boosted when they are electrostatically assembled into an organized structure pillared by hydrophilic polyelectrolytes or nanoparticles in a layer-by-layer (LbL) fashion. In particular, their mass activity on a planar electrode can be as large as 2.267 mA·µg −1 toward oxygen evolution reaction (OER), when NiFe-LDH nanosheets are electrostatically connected by poly(sodium 4-styrenesulfonate) (PSS), while drop-casted NiFe-LDH nanosheets only have a mass activity of 0.116 mA·µg −1 . In addition, these homogeneous NiFe-LDH nanofilms can be easily deposited on three-dimensional (3D) surfaces with high areas, such as carbon cloths, to serve as practical electrodes with overpotentials of 328 mV at a current density of 100 mA·cm −2 , and stability for 40 h. Furthermore, Pt nanoparticles can be LbL assembled with NiFe-LDH as bifunctional electrodes for synergistically boosted oxygen and hydrogen evolution reactions (HER), leading to successful overall water splitting powered by a 1.5 V battery. This study heralds the spatial control of 2D nanomaterials in nanoscale precision as an efficient strategy for the design of advanced electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2021
·Vol. 11
·期 5
·1504-1514
·
IF 3.442
Qingqing Zhang,Qingqing Zhang,Xueqin Wang,Xueqin Wang,Jinguo Jiang,Hen Yao,Qian Nie,Zhongchen Bai,Zhongchen Bai
We prepared an active large-area uniform Ag nanostructure film by using the thermally reducing polyvinyl alcohol (PVA)/silver nitrate (AgNO3) composite film for surface-enhanced Raman scattering (SERS) application. The PVA/AgNO3 composite films were spin-coated on the surface of indium tin oxide (ITO) glass, and then were heated to about 500 °C for 10 minutes, forming Ag nanostructure films with a thickness of 100 nm and a large area of 3.24 cm2. The results showed that single layer Ag nano-film had a network structure with a skeleton distribution. Moreover, the large ratio of Ag nanostructure to film area was about 63%. Using melamine molecules as a probe, the maximum enhancement factor of the SERS signal could reach 1149, and the SERS sensitivity and the minimum detection limit were respectively up to 76.91 and 3.85 ng/ml. This method of preparing SERS film can provide a new pathway for the application of low-cost and large-area SERS substrates.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Jiliang Yan,Chunyan You,Xiaodan Chen,Danting Yang,Yingcong Chen,Yanye Tu,Jianqiang Xu,Qiaoping Wu
Arsenic is considered one of the major threats to human health, and development of chemical sensors for rapid and simple arsenic detection is increasing attention. In this paper, we developed a chemical sensing platform targeting arsenic oxide (As(V)) based on phenylboronic acid’s unique recognition capability, which could covalently bind cis-diol-containing molecules by the boronate affinity reaction in alkaline media. As far as we know, this is the first example of using phenylboronic acid to selectively capture the cis-hydroxy-containing inorganic anions, which will open up a horizon in molecular recognition. The covalent interaction between As(V) and phenylboronic acid was confirmed by mass spectroscopy. The phenylboronic acid was immobilized on a Au nanostructured film to fabricate a chemical sensing platform coupled with a surface-enhanced Raman scattering (SERS) technique. The chemical SERS sensor was pH-dependent because of the pH-controllable boronate reaction and displayed a high selectivity and sensitivity to As(V) with a detection limit of 1 ppb. Such a SERS sensor was applied to detect As(V) spiked in urine samples, water quality, domestic drinking water, and seawater with accuracy and short assay time. The developed SERS sensor offers distinct advantages over existing methods since it is highly selective and sensitive and can be used in practical applications such as urine samples, water quality, domestic drinking water, and seawater.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
·
传感器与执行器
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）