Ultrathin Leaf-Shaped CuO Nanosheets Based Sensor Device for Enhanced Hydrogen Sulfide Gas Sensing Application

Chemosensors

Wen Zeng¹  Mohsen A. M. Alhamami²  Rajesh Kumar³  Turki Alsuwian⁴  Mohammad Shaheer Akhtar⁵  Ahmad Umar⁶  Hassan Algadi⁶  Hasan Albargi⁶  Ahmed A. Ibrahim⁶ 

[1] College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;Department of Chemistry, Faculty of Science and Arts, Najran University, Najran 11001, Saudi Arabia;Department of Chemistry, Jagdish Chandra DAV College Dasuya, Punjab 144205, India;Department of Electrical Engineering, College of Engineering, Najran University, Najran 11001, Saudi Arabia;New & Renewable Energy Material Development Center (NewREC), Jeonbuk National University, Jeonbuk 56332, Korea;Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia;

关键词: leaf-shaped;    nanosheets;    CuO;    gas sensor;    H₂S;   

DOI  :  10.3390/chemosensors9080221

来源: DOAJ

【 摘 要 】

Herein, a simple, economical and low temperature synthesis of leaf-shaped CuO nanosheets is reported. As-synthesized CuO was examined through different techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD), fourier transform infrared spectroscopic (FTIR) and Raman spectroscopy to ascertain the purity, crystal phase, morphology, vibrational, optical and diffraction features. FESEM and TEM images revealed a thin leaf-like morphology for CuO nanosheets. An interplanar distance of ~0.25 nm corresponding to the (110) diffraction plane of the monoclinic phase of the CuO was revealed from the HRTEM images XRD analysis indicated a monoclinic tenorite crystalline phase of the synthesized CuO nanosheets. The average crystallite size for leaf-shaped CuO nanosheets was found to be 14.28 nm. Furthermore, a chemo-resistive-type gas sensor based on leaf-shaped CuO nanosheets was fabricated to effectively and selectively detect H₂S gas. The fabricated sensor showed maximum gas response at an optimized temperature of 300 °C towards 200 ppm H₂S gas. The corresponding response and recovery times were 97 s and 100 s, respectively. The leaf-shaped CuO nanosheets-based gas sensor also exhibited excellent selectivity towards H₂S gas as compared to other analyte gases including NH₃, CH₃OH, CH₃CH₂OH, CO and H₂. Finally, we have proposed a gas sensing mechanism based upon the formation of chemo-resistive CuO nanosheets.

【 授权许可】

Unknown