Cell Reports Physical Science
·
2023
·
IF 8.9
Ying Cui,Jiawei Jiang,Wenbo Mi,Yin Xiao
Chiral perovskites have drawn much attention due to their abundant applications in electronic, magnetic, and spintronic technologies. Herein, we report fabrication of a five-layer chiral perovskite nanowire (n = 5) and its polarity preference regulation using chiral phenylethylamine or 2- butylamine as chiral ligands. We verify that the chiroptical response of the five-layer nanowire is governed by the localized surface chiral potential related to the ligand-induced helical distortion of [PbX 6 ] 4– octahedra on the top and bottom layers. Accordingly, an optical enantiomeric pair is created by varying the ligand’s type or concentration rather than inversion of the ligand’s absolute configuration. This phenomenon cannot be achieved in perovskite nanoplates. Circularly polarized luminescence ranges from 450 nm to 580 nm, and a highest luminescence dissymmetry factor of (2.67 ± 0.5) × 10 −2 is achieved. This approach unlocks high-n chiral perovskite nanostructures and provides an additional degree of freedom beyond configurational chirality in regulating polarity.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 11
·2101-2107
·
IF 4.59
Ying Wang,Ran Du,Jinjie Qian,Yue Hu
Graphical Standing tall : Herein, a type of hierarchically ultra-fine CoP attached onto nanostructured CuO nanowire flowers (CuO NWF-CoP/CF) has been conveniently obtained by electrodeposition method, which exhibits outstanding oxygen evolution reaction activity with a small overpotential of 230 mV to achieve a current density of 50 mA cm −2 in 1.0 M KOH together with a satisfying long-term stability. The facile fabrication of high-performance and low-cost photo-/electro-catalysts for oxygen evolution reaction (OER) still presents a tough challenge. Herein, a type of hierarchically ultra-fine CoP attached to CuO nanowire flowers (CuO NWF-CoP/CF) has been obtained by a simple electrodeposition method. Due to the merits of the 3D hierarchical structure with large surface areas, rich active sites, and open-channels for effective gas diffusion, as-achieved CuO NWF-CoP/CF catalysts exhibit outstanding OER activity with an overpotential of 230 mV for OER to achieve a current density of 50 mA cm −2 in alkaline media. This work provides a novel method to prepare hierarchical self-supported electrocatalyst towards efficient water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 24
·4417
·
IF 4.329
Xue Li,Ling Weng,Hebing Wang,Xiaoming Wang
To promote the construction of the thermal network in the epoxy resin (EP), a certain proportion of silver nanowires (AgNWs) coupled with the hexagonal boron nitride (BN) nanoplates were chosen as fillers to improve the thermal conductivity of EP resin. Before preparing the composites, BN was treated by silane coupling agent 3-aminopropyltriethoxysilane (KH550), and AgNWs was coated by dopamine hydrochloride. The BN/AgNWs/EP composites were prepared after curing, and the thermal conductivity and dielectric properties of the composites was tested. Results showed that the AgNWs and BN were uniformly dispersed in epoxy resin. It synergistically built a thermal network and greatly increased the thermal conductivity of the composites, which increased 9% after adding AgNWs. Moreover, the electrical property test showed that the addition of AgNWs had little effect on the dielectric constant and dielectric loss of the composites, indicating a rather good electrical insulation of the composites.Keywords:epoxy resin;boron nitride;silver nanowires;thermal conductivity
研究领域:
材料科学
·
热管理技术
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 90
·74126-74131
·
IF 3.84
Jun Zhu,Xiufang Xu,Jinglei Liu,Yiqun Zheng,Shifeng Hou
We report a facile method for the synthesis of oleylamine-capped silver (Ag) nanowires in high purity. For the first time, Ag nanowires could be produced in high purity via a simple one-pot approach in a hydrophobic phase. The success of this synthesis relies on the use of Cu2+ to mediate the reduction of silver bromide (AgBr) by oleylamine at an elevated temperature, which promoted the high-yield formation of Ag products with a wire-like shape. These Ag nanowires were washed and deposited on PET films to form a transparent conductive electrode (TCE), which showed a sheet resistance of 34.0 Ω sq−1 and an optical transmittance of 70–80% at visible wavelengths. In addition to TCEs, these nanowires could also find important applications in the fields of conductive ink, and wearable electronics, among others.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2024
·Vol. 196
·期 9
·6378-6394
·
IF 3.1
Wang Xiaoyu,Cong Qianming,Feng Chenxu,Sun Zizhan,Cai Zhengyu,Fan Chuangang,Pei Lizhai
Terbium vanadate nanowires were synthesized via a facile chemical approach using sodium vanadate and terbium chloride. Morphology, structure, composition, and electrochemical characteristics of the terbium vanadate nanowires were investigated by different techniques. Terbium vanadate nanowires with single crystalline tetragonal TbVO 4 phase possess smooth surface and flat tips. The length of the nanowires is longer than 5 μm, and diameter is 40–100 nm. Terbium vanadate nanowires modified electrode was used for trace-level mercury ions (Hg 2+ ) detection. One well-defined stripping peak exists at − 0.34 V at the terbium vanadate nanowires modified electrode in 0.1 mM Hg 2+ solution. Buffer solution pH value, deposition time, deposition potential, and standing time are pH = 1, 150 s, − 1.5 V, and 60 s, respectively. Detection limit for Hg 2+ detection is 0.18 nM, and linear range is 0.01–100 μM. The proposed terbium vanadate nanowires modified electrode exhibits significant selectivity, stability, and reproducibility toward Hg 2+ . The usefulness of the developed sensor based on the terbium vanadate nanowires modified electrode was verified by Hg 2+ detection in real samples.
研究领域:
材料科学
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纳米技术
·
分析化学
·
环境监测
·
电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 4
·192
·
IF 3.504
Yifan Zheng,Nana Chen,Chunxiao Wang,Xiaoping Zhang,Zongjian Liu
While high-aspect-ratio metal nanowires are essential for producing nanowire-based electrodes of good performance used in electronics and electrocatalysis, the synthesis of millimeter-long Cu nanowires remains a challenge. This work demonstrates an oleylamine-mediated hydrothermal method for synthesis of Cu nanowires with an average diameter of ~80 nm and a length up to several millimeters. An investigation on the role of oleylamine in nanowire formation by mass spectroscopy, small angle X-ray diffraction and transmission electron microscopy reveals that oleylamine serves as a mild reducing agent for slow reduction of Cu(II) to Cu, a complexing agent to form Cu(II)-oleylamine complex for guiding the nanowire growth, as well as a surfactant to generate lamellar phase structure for the formation of nanowire bundles. The growth mechanism of these millimeter-long Cu nanowire bundles is proposed based on the experimental observations. Electrochemical measurements by linear sweep voltammetry indicate that the self-supported nanowire electrode prepared from as-formed Cu nanowire bundles shows high catalytic activity for electroreduction of nitrate in water.Keywords:Cu nanowires;hydrothermal method;oleylamine;nitrate;electroreduction
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1389-1396
·
IF 3.382
Zhuo Chen,Lvming Dong,Hanchuan Tang,Yan Yu,Lei Ye,Jianfeng Zang
One-dimensional all-inorganic halide perovskites have emerged as one of the most prominent materials in the application of optoelectronic devices due to their remarkable properties such as a low number of defects, morphological anisotropy, mechanical flexibility and fast charge transfer capability. Particularly, cubic (α) phase CsPbI3 has the narrowest band gap of 1.73 eV among all-inorganic lead halide perovskites, exhibiting the greatest potential in solar cell applications. However, the direct synthesis of room temperature stabilized α-CsPbI3 nanowires is challenging and remains unfulfilled because the synthesis reaction usually involves a phase change process, resulting in an undesired orthorhombic (δ) phase with a wider bandgap of 2.82 eV. Here, we report a low-temperature approach to directly synthesize highly stabilized α-CsPbI3 nanowires. Low reaction temperature, capping ligand protection, and extended growth time are employed to successfully grow α-CsPbI3 nanowires. The as-synthesized α-CsPbI3 nanowires are 10–20 μm in length and 5–80 nm in diameter. The X-ray diffraction (XRD), photoluminescence (PL), and UV-vis absorption results verify that these cubic phase nanowires maintain excellent stability at room temperature for 90 days. The CsPbI3 nanowires show a PL peak located at around 685 nm and the UV-vis absorption spectrum further reveals that the band gap is about 1.77 eV. The excellent optical properties of the phase-stable CsPbI3 nanowires offer great potential in the field of optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Energetic Materials Frontiers
·
2021
·
IF 0
Rong-rong Yang,Chang-kun Song,Ya-jie Chen,Guo-wei Zeng,Jia-xin Wang,Jun-hong Chen,Wen-chao Zhang
The large energy release potential and highly adjustable combustion characteristics of nanostructured silicon compounded with sodium perchlorate (NaClO 4 ) make it one of the most attractive inorganic energetic materials. Compared with nanoporous silicon, the silicon nanowires prepared by metal-assisted chemical etching are easily loaded with NaClO 4 to obtain energetic materials, due to their one-dimensional array structure and tight contact with the silicon substrate. However, the high hygroscopicity of NaClO 4 greatly degrades the long-term storage property of the material, and must be addressed. In this study, sulfur, as a known stable and non-hygroscopic oxidant that reacts with nanostructured silicon, was impregnated on the silicon nanowires/NaClO 4 energetic material to insulate NaClO 4 from H 2 O in the ambient air. After sulfur impregnation, the mass of the sample increased by 8.7 mg after being exposed to 98% relative humidity at 25 °C for 12 h, while the sample without sulfur increased by 50 mg, indicating significant improvement in the hygrophobicity of the sulfur-containing energetic material. Laser ignition experiments showed that the combustion performance was only slightly affected after sulfur treatment. This work provides a new strategy for improving the hygrophobicity of silicon-based energetic materials, which can improve their applicability in micro-electromechanical systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
Nanomaterials
·
2018
·Vol. 8
·期 5
·318
·
IF 3.504
Xin Zhang,Caichi Liu,Gang Ren,Shiyun Li,Chenghao Bi,Qiuyan Hao,Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH3NH3PbI3nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH3NH3PbI3thin films, reports on the fabrication of CH3NH3PbI3nanowires for optoelectrical application are rather limited. Herein, a two-step spin-coating process has been utilized to fabricate pure-phase and single-crystalline CH3NH3PbI3nanowires on a substrate without mesoporous TiO2or Al2O3. The size and density of CH3NH3PbI3nanowires can be easily controlled by changing the PbI2precursor concentration. The as-prepared CH3NH3PbI3nanowires are utilized to fabricate photodetectors, which exhibit a fairly high switching ratio of ~600, a responsivity of 55 mA/W, and a normalized detectivity of 0.5 × 1011jones under 532 nm light illumination (40 mW/cm2) at a very low bias voltage of 0.1 V. The as-prepared perovskite CH3NH3PbI3nanowires with excellent optoelectronic properties are regarded to be a potential candidate for high-performance photodetector application.Keywords:perovskite;CH3NH3PbI3nanowires;spincoating;photodetectors
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Yinqing Zhang,Kunkun Wang,Yi Yang,Jinliang Xu,Binbin Sun,Lingyan Zhu
Silver nanowires (AgNWs) are widely produced in many electronic and optical products, and could be inevitably discharged into the aquatic environments. Sulfidation is one of the most important transformation processes of AgNWs, and could significantly affect their fate and interactions with other pollutants in aquatic environment. In the present study, the sulfidation products of AgNWs with different atomic ratio of Ag and S were prepared under environmentally relevant conditions. The crystal structure, elemental composition, morphology and size of the sulfidation products were comprehensively characterized by powder X-ray diffraction, UV–vis spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscope . The products were heterostructured nanowires and the Ag 2 S/Ag molar ratio increased with extension of the reaction time. The produced Ag 2 S–Ag nanowires displayed a good photocatalytic activity and facilitated the degradation of the copresent organic pollutant bisphenol A (BPA) under simulated sunlight irradiation. As sulfidation time increased, more Ag 2 S was generated and the Ag 2 S–Ag composites displayed high promotion effect on BPA degradation. This effect could be ascribed to the favorable synergistic effects between Ag 2 S and AgNWs, such as high electron-hole separation efficiency and low charge transfer resistance. The chemical scavenger experiments demonstrated that superoxide anion radicals and photogenerated holes in the sulfidation products of AgNWs could be the main reactive species for photocatalytic degradation .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1062
·
IF 4.034
Yi Chu,Yingjie Xing,Hongqi Xu
SmB6nanowires, as a prototype of nanostructured topological Kondo insulator, have shown rich novel physical phenomena relating to their surface. Catalyst-assisted chemical vapor deposition (CVD) is a common approach to prepare SmB6nanowires and Ni is the most popular catalyst used to initiate the growth of SmB6nanowires. Here, we study the effect of growth mechanism on the surface of SmB6nanowires synthesized by CVD. Two types of SmB6nanowires are obtained when using Ni as the catalyst. In addition to pure SmB6nanowires without Ni impurity, a small amount of Ni is detected on the surface of some SmB6nanowires by element analysis with transmission electron microscopy. In order to eliminate the possible distribution of Ni on nanowire surface, we synthesize single crystalline SmB6nanowires by CVD without using catalyst. The difference between catalyst-assisted and catalyst-free growth mechanism is discussed.Keywords:nanowires;synthesis;CVD;topological insulators;growth mechanism
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Zhiqiang Lai,Tao Zhao,Pengli Zhu,Dan Liu,Xianwen Liang,Rong Sun
Recently, improving the reliability of silver nanowire (AgNW) has become an interesting topic for promoting working performance and service life of portable electronic devices. In this work, flexible, transparent, and highly conductive AgNW-based films are fabricated by electroplating Cu, Co, or Ni on polyethylene terephthalate. The AgNW network deposited by metal shell (Metal@AgNW) via electroplating exhibits improved conductivity with acceptable transmittance. The Metal@AgNW effectively enhances the chemical reliability of AgNW concerning the electrochemical migration and the UV degradation of Ag, maintaining a superior mechanical property. For the sulfurizing degradation of AgNW, only Ni@AgNW holds a relatively strong resistance. In addition, a high electromagnetic interference (EMI) shielding effectiveness (SE) up to 30 dB of Metal@AgNW with a good stability in the frequency range of 8.2–12.5 GHz is obtained, which is higher than that of pristine AgNW network. Theoretical calculations in combination with the corresponding experiments are employed to investigate the mechanism of electroplating Cu, Co, or Ni on AgNW. As a result, electroplated Ni on AgNW is the densest and most reliable coating in comparison to other metals due to the relatively strong interaction between electroplated Ni particles and the Ag surface. Therefore, electroplating Ni on AgNW is the preferred approach to obtain flexible, transparent, and high-conductivity films with superior reliability.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
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