CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongming Liu,Jingxin Wang,Hai Xiong,Yue Chen,Jianzhong Xiao,Chao Wang
Restricted by an insufficient understanding of the compositional and structural characteristics of the sensing materials that affect the sensing performances, the YSZ-based CO gas sensor remains in a dilemma in terms of further promoting sensitivity, selectivity and long-term stability. In this work, two bimetallic oxides with different crystal structures, perovskite SmMnO 3 and mullite SmMn 2 O 5 , were prepared and adopted to elucidate the roles of the Mn 3+ , Mn 4+ and surface oxygen vacancies . Compared with SmMnO 3 , the coexisting coordination modes of Mn 3+ and Mn 4+ in SmMn 2 O 5 is conducive to generating oxygen vacancies. Furthermore, a SmMn 2 O 5 -based sensor with more oxygen vacancies demonstrates a relatively faster response/recovery speed and enhanced sensitivity of 2.05 times that of SmMnO 3 under the same operation conditions. Such work may broaden insight into the development of efficient sensing materials that introduce oxygen vacancies through the construction of phase structures without complicated operations. Overall, the sensor attached to SmMn 2 O 5 exhibits a low detection limit (5 ppm), a feasible response/recovery speed (24 s/28 s toward 40 ppm CO operating at 450 °C), satisfactory CO selectivity and long-term stability, highlighting its potential for CO monitoring in harsh environments.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 17
·e202401101
·
IF 1.9
Xiangming Hu,Zhenyu Yang,Mingyue Wu,Yuntao Liang,Wei Wang,Fusheng Wang,Qian Zhang,Jingran Mao,Ning Yang,Xuwei Wang
Graphical This paper selectes MBioFs with copper ions as the metal center to design an MBioFs/PANI composite suitable for CO gas sensors. The morphology and nanostructure of the prepared materials were thoroughly analyzed, followed by testing their gas-sensing properties. Subsequently, the gas sensing mechanism of composite materials was proposed and discussed in detail. In addressing the issue of poor gas sensitivity in semiconductor CO sensor materials used in mining, such as pure PANI. This study utilized an ice-water bath in combination with an in-situ polymerization method to synthesize a new composite material consisting of Cu(II)-racemic glutamate nanofibers and PANI. The morphology, structure, and chemical bonds of the composite material were analyzed using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and spectral analysis. The material's ability to detect CO (100–500 ppm) at room temperature was investigated, revealing a response value of up to 6.8 % for 400 ppm CO detection when the composite material was deposited on a ceramic interdigital electrode. The material exhibited good selectivity and responsiveness to CO detection at room temperature, attributed to the heterojunction formed between Cu(II)-racemic glutamate nanofibers and PANI, which enhanced carrier migration. Consequently, the Cu(II)-racemic glutamate nanofiber/PANI composite(Cu(II)-RGlu/PANI) material shows promise as a high-performance sensing material for CO detection at room temperature and as a low-power, integrable sensor material for underground coal mines. This research contributes to the development of a theoretical framework for such applications.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingcai Chen,Pengpeng Li,Bing Wang,Yingde Wang
CO sensor is helpful to monitor the working state of combustion equipment, such as industrial boilers and engines, and to ensure the production process and human life safety. However, balancing fast response/recovery and high response value for metal oxide CO sensors remains a challenge. In this work, based on band gap engineering, porous TiO 2 /CeO 2 NSs with different TiO 2 coupling amounts were prepared by hydrothermal method combined with flame annealing. The heterojunction composed of TiO 2 and CeO 2 narrowed the energy band width of the composite system and made the electron transmission more efficient, which endowed TiO 2 /CeO 2 NSs with good gas sensing properties. The results indicated that the response value of TiO 2 /CeO 2 NSs is 9.78 time that of CeO 2 NSs. Its ultrafast response/recovery time (2 s/6 s), good CO selectivity and wide CO monitoring range (500 ppb-5000 ppm) are also impressive. The TiO 2 /CeO 2 NSs sensor has great potential for rapid CO monitoring.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Chaozhu Huang,Jingwei Zhao,Haichuan Guo,Ziqin Zhuang,Xiaohang Wang,Jiuyang Yu,Fengdong Qu,Minghui Yang
Gas sensing catalyst is the key to proton exchange membrane fuel cell type gas sensor. However, due to the limitations of Pt/C catalyst in an electronic structure and electrochemical stability, the sensing performance of the sensor inconformity the strict performance objectives, and new sensing materials are required. Here we demonstrate that a novel sensing catalyst, Pt/Ti 0.8 Mo 0.2 N, is a highly efficient CO sensing that outperforms the benchmark material Pt/TiN and Pt/C. Pt/Ti 0.8 Mo 0.2 N effectively reduces the cross-sensitivity of interfering gas and greatly improves the CO selectivity, sensitivity and long-term stability of the sensor. Simultaneously, profit by the design of a high humidity cathode sealing chamber, the relative humidity of the environment exhibits a slight impact on the sensor. Furthermore, we confirm that Pt/Ti 0.8 Mo 0.2 N exhibit the best gas sensing performance at low Pt loading of 15 wt%. This discovery points to the strategy of combining low-cost and high-performance electrode catalytic materials for new generation gas sensors.
研究领域:
材料科学
·
传感器技术
·
燃料电池
✓ 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）