X射线光电子能谱
拉曼光谱
材料科学
三元运算
石墨烯
扫描电子显微镜
透射电子显微镜
吸附
甲醛
分析化学(期刊)
化学工程
纳米技术
复合材料
化学
物理化学
光学
有机化学
物理
工程类
计算机科学
程序设计语言
作者
Shahid Mehmood,Faheem Ullah Khan,Muhmmad Naeem Shah,Junxian Ma,Yatao Yang,Guijun Li,Wei Xu,Xiaojin Zhao,He Wang,Xiaofang Pan
标识
DOI:10.3389/fchem.2022.971859
摘要
Ternary composite with great modulation of electron transfers has attracted a lot of attention from the field of high-performance room-temperature (RT) gas sensing. Herein, walnut-like WO 3 -Ni–graphene ternary composites were successfully synthesized by the hydrothermal method for formaldehyde (HCHO) sensing at RT. The structural and morphological analyses were carried out by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). SEM and TEM studies confirmed that walnut-like WO 3 nanostructures with an average size of 53 ± 23 nm were functionalized. The Raman and XPS results revealed that, due to the deformation of the O-W-O lattice, surface oxygen vacancies O v and surface-adsorbed oxygen species O c were present. The gas-sensing measurement shows that the response of the WO 3 -Ni-Gr composite (86.8%) was higher than that of the Ni-Gr composite (22.7%) for 500 ppm HCHO at RT. Gas-sensing enhancement can be attributed to a p-n heterojunction formation between WO 3 and Ni-Gr, O c , spill-over effect of Ni decoration, and a special walnut-like structure. Moreover, long term stability (%R = 61.41 ± 1.66) for 30 days and high selectivity in the presence of other gases against HCHO suggested that the proposed sensor could be an ideal candidate for future commercial HCHO-sensing in a real environment.
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