JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 1
·24-30
·
IF 2.326
Lu Qingjian,Gao Min,Lu Chang,Pan Taisong,Cheng Tiedong,Long Fei,Lin Yuan
Vanadium dioxide (VO 2 ) has unique electrical and optical properties, which have practical applications in many devices. However, preparing high-quality VO 2 films and transferring them to flexible substrates by an economic and simple way are still challenging. Functional thin films can be grown on van der Waals (vdW) substrates and then transferred to flexible substrates due to the weak interaction between films and their substrates. Herein, VO 2 thin films were grown on mica substrates by using the polymer-assisted deposition technique. By controlling the ion concentration in the polymer precursor solution, a flat seed layer was prepared at the initial growth stage. It was found that the introduction of the seed layer can improve the crystallinity, increase the grain size and reduce the defects of the VO 2 thin films. It is believed that less nucleation density and layered growth at the initial growth stage are critical to the formation of large size grains. Our results confirmed that chemical solution deposition can prepared high-quality VO 2 films on vdW substrates.
研究领域:
材料科学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zenghui Wu,Guoan Tai,Runsheng Liu,Chuang Hou,Wei Shao,Xinchao Liang,Zitong Wu
The emergence of borophene has triggered soaring interest in the investigation of its superior structural anisotropy, a novel photoelectronic property for diverse potential applications. However, the structural instability and need of a metal substrate for depositing borophene restrict its large-scale applications toward high-performance electronic and optoelectric devices. van der Waals epitaxy is regarded as an efficient technique for growing superb two-dimensional materials onto extensive functional substrates, but the preparation of stable and controllable borophene on nonmetallic substrates is still not reported. Here, we demonstrate that borophene films can be synthesized onto a mica substrate by van der Waals epitaxy, where hydrogen and NaBH4 are respectively used as the carrier gas and the boron source. The lattice structure of the as-synthesized borophene coincides with the predicted α′-boron sheet. The borophene-based photodetector shows an excellent photoresponsivity of 1.04 A W–1 and a specific detectivity of 1.27 × 1011 Jones at a reversed bias of 4 V under illumination of a 625 nm light-emitting diode, which are remarkably superior to those of reported boron nanosheets. This work facilitates further studies of borophene toward its attractive properties and applications in novel optoelectronic devices and integrated circuits.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Advances
·
2022
·Vol. 5
·期 3
·693-700
·
IF 5.598
Hailin Yang,An Wu,Huaxin Yi,Weiwei Cao,Jiandong Yao,Guowei Yang,Yi-Chao Zou
Two-dimensional (2D) magnetic materials are of wide research interest owing to their promising applications in spintronic devices. Among them, chromium chalcogenide compounds are some of the limited available systems that present both high stability in air and high Curie temperatures. Epitaxial growth techniques based on chemical vapour deposition (CVD) have been demonstrated to be a robust method for growing 2D non-layered chromium chalcogenides. However, the growth mechanism is not well-understood. Here, we demonstrate the epitaxial growth of Cr3Te4 nanoplates with high quality on mica. Atomic-resolution scanning transmission electron microscopy (STEM) imaging reveals that the epitaxial growth is based on nanosized chromium oxide seed particles at the interface of Cr3Te4 and mica. The chromium oxide nanoparticle exhibits a coherent interface with both mica and Cr3Te4 with a lattice mismatch within 3%, suggesting that, as a buffer layer, chromium oxide can release the interfacial strain, and induce the growth of Cr3Te4 although there is a distinct oxygen-content difference between mica and Cr3Te4. This work provides an experimental understanding behind the epitaxial growth of 2D magnetic materials at the atomic scale and facilitates the improvement of their growth procedures for devices with high crystalline quality.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
表面科学
·
电子显微学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyin Zhang,Jirun Zou,Xinkuo Zhang,Aixiang Wei,Ningqi luo,Zhen Liu,Jiaxiong Xu,Yu Zhao
Two-dimensional (2D) ReS 2 has received widespread attention because of its unique anisotropic properties, weak interlayer interactions and broad application prospects. Therefore, the controllable and repeatable growth of 2D ReS 2 flakes is very important for studying their properties and practical applications. In this work, 2D single-crystalline ReS 2 flakes with different layer numbers were synthesized on mica substrates using chemical vapor deposition (CVD) by adjusting the distance between the mica substrate and Re source, and the growth mechanism was further discussed. The fluorescence quenching effect and surface-enhanced Raman scattering (SERS) effect of 2D ReS 2 flakes were investigated using rhodamine B (RhB), crystal violet (CV) and malachite green (MG) dye molecules as Raman probes. The results show that the fluorescence quenching effect and SERS effect of 2D ReS 2 flakes are enhanced with decreasing layer number. The lowest detection limits on monolayer ReS 2 flake substrates are 10 −10 M, 10 −9 M and 10 −8 M for RhB, CV and MG under 532 nm laser excitation, respectively. 2D ReS 2 flakes used as a sensitive SERS-active substrate have excellent uniformity and stability. The surface Raman enhancement mechanism of 2D ReS 2 flakes was discussed.
研究领域:
材料科学
·
纳米技术
·
表面化学
·
分析化学
✓ 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）