材料科学
介电谱
傅里叶变换红外光谱
热重分析
X射线光电子能谱
纳米复合材料
甲醛
碳纤维
电化学气体传感器
化学工程
分析化学(期刊)
电化学
无机化学
核化学
循环伏安法
电极
纳米技术
化学
复合数
有机化学
复合材料
物理化学
工程类
作者
Haidar Alolaywi,Surachet Duanghathaipornsuk,Steve S. Kim,Cheng-Han Li,Joerg R. Jinschek,Dong-Shik Kim,Ana Carolina Alba
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-06-01
卷期号:168 (6): 067525-067525
被引量:9
标识
DOI:10.1149/1945-7111/ac0d3c
摘要
A nanocomposite comprised of molybdenum oxide and highly conductive carbon (MoOx/Carbon) was deposited onto a screen-printed gold electrode (SPGE) to be employed as a gas sensor for the detection of formaldehyde gas. First, the carbon surface was modified by acid treatment to introduce oxygen-containing groups and promote the efficient anchorage of the molybdenum precursor by surface organometallic chemistry (SOMC). Then, once the MoOx/Carbon composite was deposited onto the SPGE, a Nafion layer was added to act as a solid-state ionic electrolyte. Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) were used to verify the carboxylated surface of carbon after the acid treatment. Scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrosand inductively coupled plasma optical emission spectrometry (ICP-OES) were also employed to confirm the success of the SOMC synthesis. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to investigate the interaction of the nanocomposite with formaldehyde at room temperature. The nanocomposite gas sensor showed an enhanced electrical current response when increasing the concentration of formaldehyde, with a limit of detection as low as 60 ppb and sensitivity of 5.13 μA ppm−1. Additionally, the nanocomposite sensor demonstrated high selectivity to formaldehyde when compared to other volatile organic compounds (VOCs).
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