纳米复合材料
甲苯
石墨氮化碳
透射电子显微镜
纳米颗粒
降水
扫描电子显微镜
材料科学
化学工程
选择性
化学
核化学
纳米技术
有机化学
复合材料
催化作用
光催化
工程类
物理
气象学
作者
Razieh Moradi,Ramin Yousefi,Zahra Adelpour,Mojtaba Sadeghi
标识
DOI:10.1016/j.jallcom.2022.167539
摘要
In this study, Ag nanoparticles (NPs) were decorated on graphitic carbon nitride (g-C3N4) sheets with different concentrations of Ag (1%, 3%, and 5%) using a co-precipitation method as a selective toluene gas sensor. The X-ray diffraction (XRD) patterns of the samples indicated that Ag NPs did not affect the phase of the g-C3N4 nanocomposites. The Ag NPs were well dispersed on the g-C3N4 sheets, as shown by transmission electron microscopy (TEM) images. The optical characterization results revealed that Ag NPs decreased the bandgap of g-C3N4 nanocomposites. The results of gas sensing indicated that compared to the pristine g-C3N4 sheets, sensors based on Ag NPs decorated g-C3N4 sheets exhibited a stronger response to toluene due to the formation of more defects and active sites on the surface of g-C3N4 sheets. Moreover, the 5%Ag/g-C3N4 nanocomposite exhibited the highest response and selectivity to 50 ppm toluene at 200 °C (25.4% and 61.3%, respectively). In addition, 5%Ag/g-C3N4 nanocomposite demonstrated a faster response/recovery time and superior long-term stability than the other sensors.
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