Science China-Chemistry
·
2016
·Vol. 59
·期 10
·1264-1269
·
IF 2.429
Liu Gang,Xue Zhenjie,Xu Guiying,Yan Cong,Wang Tie
In this paper, PbTe nanocubes are assembled on Bi 0.5 Sb 1.5 Te 3 substrates with both ordered and disordered structures through a straightforward method to form a P-N section. The work function of such semiconductor system is then measured by the ultraviolet photoelectron spectroscopy. This results show that the work function of orderly arrayed PbTe deposition is much lower than the disordered assemblies. Such change of the work function provides the possibility to tune it in a P-N section system. The change of the work function is attributed to the less surface roughness and easier electron escaping in the ordered structures.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8332-8339
·
IF 3.119
Pinhua Zhang,Hongyang Zhu,Kaifeng Xue,Li Chen,Changmin Shi,Dongchao Wang,Jianfu Li,Xiaoli Wang,Guangliang Cui
2D heterostructures are promising gas sensor materials due to their surface/interface effects and hybrid properties. In this research, Cu2O/Fe2O3 heterostructure ordered arrays were synthesized using an in situ electrodeposition method for H2S detection at low temperatures. These arrays possess a periodic long range ordered structure with horizontal multi-heterointerfaces, leading to superior gas sensitivity for synergistic effects at the heterointerfaces. The sensor based on the Cu2O/Fe2O3 heterostructure ordered arrays exhibits a dramatic improvement in H2S detection at low temperatures (even as low as −15 °C). The response is particularly significant at room and human body temperatures since the conductivity of the arrays can change by up to three orders of magnitude in a 10 ppm H2S atmosphere. These good performances are also attributed to the formation of metallic Cu2S conducting channels. Our results imply that the Cu2O/Fe2O3 heterostructure ordered arrays are promising candidates for high-performance H2S gas sensors that function at low temperatures as well as breath analysis systems for disease diagnosis.
研究领域:
材料科学
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传感器技术
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气体检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2019
·
IF 1.822
Sihong Zhang,Jianyu Wang,Yan Lu,Weiwei Hou,Kai Cao,Shouhui Guo,Zhendong Wang,Li Wang
Highly ordered arrays of WS 2 crystals are grown on the SiO 2 /Si substrate using Pt/Ti metal as seed materials by a low pressure chemical vapor deposition method. High magnification SEM images and Raman spectrum reveal that the WS 2 flakes are induced and grown around the Pt/Ti metal, and the diameter of a single unit is up to 100 μm, which have contribute to the direct construction of functional devices on the substrate. HRTEM measurements further confirm that the obtained flakes are the WS 2 crystal with good crystallinity. The results show that highly ordered arrays of WS 2 crystals will have potential applications in electronic and optoelectronic devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 104
·102258-102263
·
IF 3.289
Shujun Zhou,Xinlei Yao,Tongxiang Fan
Three-dimensionally ordered arrays of multilamellar silica nanoparticles are prepared via confined synthesis inside ordered porous carbon, the pore size of which is varied to obtain multilamellar silica nanoparticles of about 40 nm, 50 nm, and 250 nm in size. The multilamellar silica nanoparticles have mesopores of sizes within 6.8–7.8 nm according to isothermal nitrogen adsorption–desorption measurements, and they pack three-dimensionally to give an additional set of ordered interparticle pores. Such hierarchically structured silica is exploited as the support for Au nanoparticles, whose catalytic activity is evaluated through the reduction of 4-nitrophenol monitored with UV-Vis spectroscopy. It is found that the Au nanoparticles on the multilamellar silica nanoparticle arrays show higher catalytic activity than those on non-hierarchical silica supports including SBA-15 and solid silica nanoparticle arrays.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 6
·2812-2819
·
IF 7.233
Shuguang Wang,Xixi Ji,Yu Ao,Jie Yu
Three-dimensional ordering of two-dimensional nanomaterials has long been a challenge. Simultaneously, diamond nanomaterials are difficult to synthesize due to the harsh synthesizing conditions required. Here, we report substrate-crystal-orientation dependent growth of diamond nanosheets (DNSs) by chemical vapor deposition, which generates different DNS arrays on different substrates. The DNSs are grown by the in-plane epitaxy of the diamond {111} planes. So the arrays are highly ordered and solely determined by the spatial orientation of the {111} planes in the diamond FCC structure. The DNSs grown on the {110}, {111}, {001}, and {113} oriented substrates show inclination angles ranging from 90 to 29.5°. The DNSs with larger inclination angles grow preferentially, forming parallelogram arrays with inclination angles of 90° on the {110} substrates and parallel-line arrays with inclination angles of 80° on the {113} substrates. The density, thickness, size, and morphology of the DNSs have been well controlled. The present understanding and materials are highly promising for many applications such as sensors, catalysis, photonics, thermal management, and electronics.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 6
·065018
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IF 0.968
Pinhua Zhang,Guangliang Cui,Chuanhai Xiao,Mingzhe Zhang,Li Chen,Changmin Shi
We fabricated an Ag decorated Cu (Ag@Cu) nano/microstructure ordered array by facile template-free 2D electrodeposition combined with a galvanic reduction method for SERS applications. The Cu nano/microstructure ordered arrays were first synthesized by a 2D electrodeposition method, then Ag nanocubes were decorated on the arrays by galvanic reduction without any capping agent. The pollution-free surface and edge-to-face heterostructure of Ag nanocubes and Cu nano/microstructure arrays provide the powerful field-enhancements for SERS performance. The results verified that the Ag@Cu nano/microstructure ordered arrays have excellent activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10−8 M. Therefore, this facile route provides a useful platform for the fabrication of a SERS substrate based on nano/microstructure ordered arrays.
研究领域:
材料科学
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纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Liu Yijie,Zhou Jintang,Li Chenchen,Zhang Henghui,Wang Yucheng,Yan Yi,Duan Lvtong,Cheng Zhenyu,Ma Yao,Yao Zhengjun
With the development of nanotechnology, nano-functional units of different dimensions, morphologies, and sizes exhibit the potential for efficient microwave absorption (MA) performance. However, the multi-unit coupling enhancement mechanism triggered by the alignment and orientation of nano-functional units has been neglected, hindering the further development of microwave absorbing materials (MAMs). In this paper, two typical ZIF-derived nanomaterials are self-assembled into two-dimensional ordered polyhedral superstructures by the simple ice template method. The nano-functional units exhibit distinctive dielectric-sensitive behaviors after self-assembling into two-dimensional ordered arrays. The modified 2D ordered polyhedral superstructures not only inherit the atomic-level doping and well-designed shell structure, but also further amplify the loss properties to realize the multi-scale modulated MA response. Satisfactory MA performance in C, X and Ku bands is finally achieved. In particular, the ultra-broadband microwave absorption bandwidth (EAB) of 6.41 GHz is realized at 1.82 mm thickness. Our work demonstrates the two-dimensional ordered array-induced multiscale polarization behavior, providing a direction to fully utilize the potential of wave-absorbing functional units.
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2010
·Vol. 136
·期 4
·769-774
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IF 3.272
Yanying Rao,Qinfeng Chen,Jian Dong,Weiping Qian
A novel method based on surface-enhanced Raman scattering (SERS) was developed to estimate the antioxidant activity of antioxidants by using self-assembled three-dimensionally (3D) ordered gold nanoparticles (GNPs) precursor composite (SiO2/GNPs) arrays as nanoprobes. H2O2 could reduce AuCl4− to Au0 which deposited onto the surface of the SiO2/GNPs arrays and enlarged the GNPs. As the concentration of H2O2 increased, the surface coverage of the resultant gold on the silica cores increased accordingly until continuous gold nanoshells (GNSs) were formed. The change of the intensities of the SERS spectra correlated well with H2O2 concentration which indicated that this SiO2/GNPs array was a potential SERS nanoprobe for H2O2. The presence of antioxidant will prevent the growth of GNPs on the surface of the silica arrays from forming the structure which has strongest SERS-activity and the corresponding change in SERS intensity correlated well with the H2O2 scavenging activity of the antioxidants. The H2O2 scavenging activities of four plant-based antioxidants, tannic acid, citric acid, ferulic acid, and tartaric acid were studied. Our results showed the H2O2 scavenging activities (SAHP values) of these four compounds were: tannic acid > ferulic acid > citric acid > tartaric acid.
研究领域:
分析化学
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纳米生物技术
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自由基生物学
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抗氧化药理学
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分子诊断
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhongyan Gu,Ning Liu,Yudong Cheng,Yongpeng Wu,Chunhua Sun,Pengxu Chen,Fei Pan,Xiang Li,Wei Lu
Binary nanocrystals superlattices with the atomic long range ordered array of different colloidal nanocrystals are deemed as potential electromagnetic wave absorption (EWA) materials in dealing with current electromagnetic radiation problem, as their inherent superiority stems from the cooperative effect of adjacent units and strong interfacial coupling. However, relevant researches remain underdeveloped due to daunting synthetic challenges and complex electromagnetic regulation mechanism. Here, nanocarbon-bridged 2D-2D MXene superlattice with tunable vacancy defects are prepared via molecular ligands induced self-assembly and subsequently nitrogen-doped pyrolysis strategy, which resulted in “carbon-MXene-carbon-rGO-carbon” architecture. Such a periodic ordered & nano-bridging structure optimize axial charges transport over Van der Waals gap and suppressed interface formation between identical components, thereby boosting the charges localization and delocalization. Meanwhile, nitrogen doping further induce abundant Ti atom and Ti sub-nm clusters vacancy defects, together with generation of diverse dipole polarization centers. The synergistic effects of two mechanisms enabled programmable regulation of sum (ε'+ε'') and quotient (ε''/ε') of permittivity into predicted window required for low matching thickness, resulting in predictable EWA performance (1.5 mm, −56.3 dB). This work provides a versatile strategy for fabrication of atomic long range ordered heterostructures, paving the way for the development of absorbers via structural rearrangement and surface modification.
研究领域:
材料科学
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纳米技术
·
电磁学
·
凝聚态物理
·
化学合成
✓ 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）