CRYSTENGCOMM
·
2020
·Vol. 22
·期 12
·2219-2226
·
IF 3.117
Rui Zhang,Jianlei Kuang,Qipeng Lu,Qi Wang,Peng Sun,Wenxiu Liu,Shu Yin,Wenbin Cao
SnO sheets with tunable thickness were synthesized by a hydrothermal method. The thickness of the SnO sheets could be delicately controlled by adjusting the amount of PEG added. It was found that the thickness of the SnO sheets reduced from 1 μm to 150 nm with the increase in PEG. PEG was preferentially adsorbed on the (001) facets of SnO and thus inhibited the crystal growth in the <001> direction, which determined the final shape to be sheets with reduced thickness. The reduced thickness of SnO offered a shorter pathway along the two-dimensional conducting path and thus induced rapid charge transfer and high separation efficiency. Meanwhile, the reduced thickness of the SnO sheets induced an enlarged band gap and correspondingly increased the redox ability of SnO, which was confirmed by UV-vis absorbance spectroscopy and Mott–Schottky plots. Benefiting from the improved charge separation efficiency and the stronger redox ability, enhanced photocatalytic degradation efficiency was demonstrated by the SnO sheets with reduced thickness. The SnO sheets with the thinnest thickness (150 nm) exhibited optimal photocatalytic activity in the degradation of methylene blue (MB) under fluorescent light irradiation (350–800 nm); the activity was about 3.5 times higher than that of the SnO sheets with 1 μm thickness.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 2
·1274-1280
·
IF 3.159
Fan Tian,Yafang Zhang,Guangfang Li,Yunling Liu,Rong Chen
Bismuth oxychloride (BiOCl) nanosheets with tunable thickness were synthesized via a facile solvothermal method. The obtained BiOCl products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption. It was found that the metal ions (Fe3+, Co2+ and Na+) played a significant role in modulating the thickness of two-dimensional (2D) BiOCl nanostructures. Compared with commercial P25 and commercial BiOCl, the as-prepared BiOCl nanosheets exhibited superior activity for photosensitization degradation of organic dyes upon visible light irradiation. Furthermore, the photosensitization degradation activities were strongly correlated with the thickness of BiOCl nanosheets. The thinner nanosheets demonstrated a relatively high activity for the degradation of Rhodamine B (RhB). The enhanced photosensitization activities were ascribed to its low electron injection barrier and high electron mobility on the surface of BiOCl nanosheets, which was confirmed by transient photocurrent responses and electron impedance spectra of the samples.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Huifang Ma,Weiqi Dang,Xiangdong Yang,Bo Li,Zhengwei Zhang,Peng Chen,Yuan Liu,Zhong Wan,Qi Qian,Jun Luo,Ketao Zang,Xiangfeng Duan,Xidong Duan
Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDs) have recently drawn increasing interest for fundamental studies and potential applications in catalysis, charge density wave (CDW), interconnections, spin-torque devices, as well superconductors. Despite some initial efforts, the thickness-tunable synthesis of atomically thin MTMDs remains a considerable challenge. Here we report controlled synthesis of 2D cobalt telluride (CoTe2) nanosheets with tunable thickness using an atmospheric pressure chemical vapor deposition (APCVD) approach and investigate their thickness-dependent electronic properties. The resulting nanosheets show a well-faceted hexagonal or triangular geometry with a lateral dimension up to ∼200 μm. Systematic studies of growth at varying growth temperatures or flow rates demonstrate that nanosheets thickness is readily tunable from over 30 nm down to 3.1 nm. X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution scanning transmission electron microscope (STEM) studies reveal the obtained CoTe2 nanosheets are high-quality single crystals in the hexagonal 1T phase. Electrical transport studies show the 2D CoTe2 nanosheets display excellent electrical conductivities up to 4.0 × 105 S m–1 and very high breakdown current densities up to 2.1 × 107 A/cm2, both with strong thickness tunability.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 2
·2107512
·
IF 30.849
Chao Chen,Xiaodie Chen,Changwei Wu,Xiao Wang,Yue Ping,Xin Wei,Xing Zhou,Jiangbo Lu,Lujun Zhu,Jiadong Zhou,Tianyou Zhai,Junbo Han,Hua Xu
2D magnetic materials have aroused widespread research interest owing to their promising application in spintronic devices. However, exploring new kinds of 2D magnetic materials with better stability and realizing their batch synthesis remain challenging. Herein, the synthesis of air-stable 2D Cr 5 Te 8 ultrathin crystals with tunable thickness via tube-in-tube chemical vapor deposition (CVD) growth technology is reported. The importance of tube-in-tube CVD growth, which can significantly suppress the equilibrium shift to the decomposition direction and facilitate that to the synthesis reaction direction, for the synthesis of high-quality Cr 5 Te 8 with accurate composition, is highlighted. By precisely adjusting the growth temperature, the thickness of Cr 5 Te 8 nanosheets is tuned from ≈1.2 nm to tens of nanometers, with the morphology changing from triangles to hexagons. Furthermore, magneto-optical Kerr effect measurements reveal that the Cr 5 Te 8 nanosheet is ferromagnetic with strong out-of-plane spin polarization. The Curie temperature exhibits a monotonic increase from 100 to 160 K as the Cr 5 Te 8 thickness increases from 10 to 30 nm and no apparent variation in surface roughness or magnetic properties after months of exposure to air. This study provides a robust method for the controllable synthesis of high-quality 2D ferromagnetic materials, which will facilitate research progress in spintronics.
研究领域:
材料科学
·
自旋电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Xingyun Zhao,Chengxiao Zhao,Rongfang Wu,Jiangyan Jin,Xiaojian Liu,Zhenwei Zhang,Siyu Yang,Ke Li,Zhenyu Li,Xuemei Qin
The development of core-shell materials for achieving more efficient and rapid chromatographic separations has remained a key objective in separation science. In this study, monodisperse SiO 2 particles (2–4 µm in diameter) were utilized to fabricate core-shell spheres through a combined approach involving a modified sol-gel process and a biphasic system. The synthesis employed 1,6-bis(triethoxysilyl) hexane (BTMSH), 1,2-bis(triethoxysilyl) ethane (BTEE) as a bridging agent with cetyltrimethylammonium bromide (CTAB) acting as a co-template. Notably, the shell thickness could be precisely tailored within the range of 70∼300 nm through systematic optimization of stirring rate, solvent selection, and silica precursor type. The separation of aromatics analytes was evaluated and that baseline separation was achieved for both molecules on all the columns packed n -octadecyltrichlorosilane modified core-shell silica particles with tunable shell thickness. Column efficiencies up to ∼168, 325 plates m -1 were achieved for pyrene on the CS X-E -C18 column ( n -octadecyltrichlorosilane modified core-shell silica). In addition, a hydrophilic interaction liquid chromatography (HILIC) core-shell stationary phase that amide modified core shell silica was prepared (named as CS X-E -AM) via an improved polymerization coating approach and applied for oligosaccharides separation. The results demonstrated that the core-shell spheres were prepared with tailored shell structure and exhibited that the column was stable and could meet the requirement for HPLC separation.
研究领域:
分析化学
·
材料科学
·
色谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）