VACUUM
·
2020
·
IF 2.906
Ding Wang,Yu Cheng,Kechuang Wan,Jialin Yang,Jingcheng Xu,Xianying Wang
Xylene is an important chemical material and one of indoor air pollution gases. Selective detection of xylene is very important in terms of security. However, the low concentration and high selectivity detection xylene are difficult to satisfy at the same time due to their high stability. Herein, we present a highly efficient porous MoO 3 nanosheets based xylene vapor sensor. The porous MoO 3 nanosheets was prepared by calcinating MoS 2 nanosheets at 400 °C. Gas sensitivity test results show that the response values (R a /R g ) of MoO 3 nanosheets sensor to 10 ppm xylene is 9.1. Moreover, the MoO 3 sensors has low limit of detection (LOD = 0.1 ppm), high selectivity, fast response/recovery speeds (7.1 s/6.8 s), and good stability. Furthermore, we also investigate the special sensitive mechanism by analyzing the characterization and gas sensitivity test results. This work will help to develop high performance xylene gas sensors and preparation of porous metal oxide semiconductor nanosheets from sulfide nanosheets.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 38
·1902801
·
IF 10.856
Juehan Yang,Ruilong Shi,Zheng Lou,Ruiqing Chai,Kai Jiang,Guozhen Shen
The development of noncontact humidity sensors with high sensitivity, rapid response, and a facile fabrication process is urgently desired for advanced noncontact human–machine interaction (HMI) applications. Here, a flexible and transparent humidity sensor based on MoO 3 nanosheets is developed with a low-cost and easily manufactured process. The designed humidity sensor exhibits ultrahigh sensitivity, fast response, great stability, and high selectivity, exceeding the state-of-the-art humidity sensors. Furthermore, a wearable moisture analysis system is assembled for real-time monitoring of ambient humidity and human breathing states. Benefiting from the sensitive and rapid response to fingertip humidity, the sensors are successfully applied to both a smart noncontact multistage switch and a novel flexible transparent noncontact screen for smart mobile devices, demonstrating the potential of the MoO 3 nanosheets-based humidity sensors in future HMI systems.
研究领域:
材料科学
·
电子工程
·
人机交互
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Mingjun Sun,Kuan Ding,Yujie Lu,Xiaopeng She,Yi Chen,Mengqing Wang,Cheng Zou,Xiaoyu Liu,Yong Zhou
Of diverse NH 3 gas-detection strategies applied in the fields of individual healthcare and industrial production, chemiresistive gas sensors gain the most popularity owing to the superior merits of low cost, convenient signal processing and high sensitivity. However, severe challenges still exist such as elevated operation temperature (>200 °C), limited sensitivity and unsatisfactory selectivity especially under low-concentration and high-humidity conditions. To overcome these hindrances, a sensing layer of black phosphorus nanosheets (BP)-modified α-MoO 3 nanoflakes was prepared in this work. After subtle optimization of ingredient composition and operation temperature, the composite sensor S2 could recognize NH 3 gas with the concentration spanning from 0.4 to 25 ppm at 40 °C. In particular, a larger mean response (27 % vs. ∼ 2.3 %) with a response/recovery speed of 275/388 s toward 10 ppm NH 3 and lower detection of limit (LoD, 0.4 ppm vs. 10 ppm) was achieved with respect to pure BP counterpart. In addition, excellent repeatability, selectivity, long-term stability and humidity-tolerant features were demonstrated for Sensor S2 . The improved sensing performance after α-MoO 3 incorporation was primarily ascribed to abundant p-n heterojunctions, excellent conductivity of BP and hydrophilic MoO 3 that mitigated the water corrosion effect on susceptible BP nanosheets. This work offers an alternative strategy for sensitive and low-temperature NH 3 detection, and well cater for the demanding requirements of high sensitivity and low-power consumption in the field of novel gas sensors applicable in the future Internet of Things and exhaled breath-oriented medical diagnosis.
研究领域:
材料科学
·
化学传感
·
生物医学工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Litao Han,Hong Liu,Chen Lu,Yuanzhi Wei,Fanjun Kong
Molybdenum trioxide (MoO 3 ) possesses unique layered structure with high theoretical capacity and good environmental friendliness, which has been widely investigated as a potential anode material. Herein, MoO 3 nanosheets anchored in N-doped reduced graphene oxide (MoO 3 /NG) composite was constructed and prepared through hydrothermal reaction and post-calcination. The introduction of NG matrix can enhance the electronic conductivity and accelerate reaction kinetics of the MoO 3 , and solve the problem of severe capacity decay caused by its volume changes. MoO 3 /NG composite can deliver superior cycling performance (900.2 mAh g −1 at 0.2 Ag −1 after 100 cycles and 407.5 mAh g −1 at 10.0 Ag −1 after 500 cycles) and fast reaction kinetics with high diffusion coefficients and low charge transfer resistances. Moreover, the excellent electrochemical performance of the full battery lays a solid foundation for subsequent commercial application research.
研究领域:
材料科学
·
纳米技术
·
电化学
·
储能
✓ 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）