Materials
·
2024
·Vol. 17
·期 10
·2190
·
IF 3.1
Xuemin Luo,Yanhui Jiao,Hang Li,Qi Liu,Jinfeng Liu,Mingwei Wang,Yong Liu
Transition metal dichalcogenides (TMDs), particularly monolayer TMDs with direct bandgap properties, are key to advancing optoelectronic device technology. WSe2stands out due to its adjustable carrier transport, making it a prime candidate for optoelectronic applications. This study explores monolayer WSe2synthesis via H2-assisted CVD, focusing on how carrier gas flow rate affects WSe2quality. A comprehensive characterization of monolayer WSe2was conducted using OM (optical microscope), Raman spectroscopy, PL spectroscopy, AFM, SEM, XPS, HRTEM, and XRD. It was found that H2incorporation and flow rate critically influence WSe2’s growth and structural integrity, with low flow rates favoring precursor concentration for product formation and high rates causing disintegration of existing structures. This research accentuates the significance of fine-tuning the carrier gas flow rate for optimizing monolayer WSe2synthesis, offering insights for fabricating monolayer TMDs like WS2, MoSe2, and MoS2, and facilitating their broader integration into optoelectronic devices.
研究领域:
材料科学
·
化学工程
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 5
·547
·
IF 2.881
Minyu Bai,Shuai Wen,Jijie Zhao,Yuxuan Du,Fei Xie,Huan Liu
The carrier gas flow field plays a vital role in the chemical vapor deposition (CVD) process of two dimensional (2D) MoS2crystal, which was studied by simulations and experiments. Different carrier gas flow fields were studied by utilizing three types of precursor carrier which affected the local gas flow field significantly. The experiment results showed that the appropriate precursor vapor concentration could be achieved by local carrier gas flow field conditioning, resulting in single 2D MoS2crystals of a large size and a high coating rate of 2D MoS2crystal on the target substrate surface. The carrier gas flow also contributed to the growth of the 2D MoS2crystal when it flew towards the target surface. The size of deposited single 2D MoS2crystal reached tens of micrometers and a few layers of 2D MoS2crystal were characterized and confirmed.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yanan Liu,Qiancheng Wang,Cihao Wang,Ai Zhang,Keliang Huang,Jinxia Liu,Andere Clement Miruka,Qianhan Han,Ying Guo
The development of feasible and environmentally friendly technologies to remove dichloroacetic acid (DCAA) from water is needed worldwide to reduce human exposure to this common disinfection byproduct and to minimize cancer risk. In this study, we reported a novel, independently designed water-recirculation-continuous- flow corona discharge reactor (WCD) with integrated microbubble (MB) generation for DCAA treatment. Compared with the performance of WCD or MBs alone, the integrated system (WCD/MBs) showed synergistic effects on DCAA degradation. The functional active species were confirmed to be •OH, •O 2 – , ONOO – , and e - . The effects of the discharge power, bubble size, and carrier gas were evaluated. At a discharge power of 22.9 W and a bubble size of 34.5 μm, the DCAA removal efficiency reached 76% after treatment for 120 min in the air-WCD/MBs reactor. Based on the intermediates detected by IC, GC–MS, and HPLC-QTOF, several DCAA degradation pathways were proposed, including H-abstraction, dechlorination, carbon–carbon bond cleavage, nitrogen dioxide radical reaction, and ipso attack by amine and azido groups. The WCD/MBs system can be applied to tap water, and its energy yield compares favorably with that of other technologies. The novel non-thermal plasma treatment system provides a sustainable and feasible solution for DCAA removal.
研究领域:
环境工程
·
水处理
·
等离子体化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Baoqing Han,Guishan Wu,Hao Huang,Tinghan Liu,Jiuhong Wang,Jianhai Sun,Hairong Wang
The separation and detection of human breath play a significant role in early and non-invasive disease diagnosis. Various volatile organic compound (VOC) gases are considered as the biomarkers of a nonalcoholic fatty liver disease (NAFLD) patient. In this paper, a micro gas chromatography (GC) column used for VOCs separation of the NAFLD breath sample was presented, from its design, fabrication and separation performance testing. The serpentine column made using microelectromechanical system (MEMS) technology was chosen for its relatively small band broadening. The micro pillar configuration was simulated and optimized. The 3 m and 1 m long column with a cross-section of 200 μm × 240 μm was fabricated by deep-reactive-ion-etching (DRIE) method and sealed with anodic bonding. The stationary phase was coated to the inner wall of the column by static coating. The column was installed into the conventional gas chromatography to test separation performance of the GC. The nonpolar alkane mixture containing the NAFLD biomarker gas pentane was separated and the experimental factors such as the temperature and the carrier gas flow rate were studied. The results indicated that the micro GC column can effectively separate alkanes from C 5 -C 12 within 5 min. This could help the micro detector of micro GC system to quickly identify the contents or concentrations of characteristic alkanes. The micro GC column can meet the requirements of the micro GC system for the breath analysis of the NAFLD or other metabolic liver diseases. The micro column assembled with micro gas detector and preconcentrator can be hopefully developed into a portable breath analysis device.
研究领域:
分析化学
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医学诊断
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生物医学工程
·
微流控
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）