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Application of candle soot CNPs-TiO2-PVP composite in the detection of volatile organic compounds with aldehyde, amine and ketone functional groups by resistance and impedance responses
Nano Express Pub Date : 2021-04-22 , DOI: 10.1088/2632-959x/abf60a
G E Olifant 1, 2 , K Kondiah 1 , M A Mamo 2, 3
Affiliation  

We have fabricated a solid-state gas sensor using a composite sensor layer made up of three different sensing materials namely; candle soot Carbon nanoparticles, Titanium dioxide and Poly (vinyl) pyrrolidone (PVP). The study was carried out to study the sensor’s response towards butyraldehyde, diethylamine and isobutyrophenone vapour at room temperature. The sensor was prepared by mixing candle soot CNPs, TiO2 and PVP in dimethylformamide using the ratio (2:1:3) respectively. The sensing materials were characterised using Brunauer–Emmett–Teller (BET), x-ray diffraction (XRD), Transmission and Scanning Electron Microscopy (TEM, SEM). The sensor’s response was measured by injecting a volume of 1 to 5 μl of each liquid analyte in a round-bottomed glass and an LCR metre was used to measure the ∆R and ∆Z responses. In both parameters, the sensor responded well to the different analytes, the response of the sensor linearly increases as the analyte vapour concentration increases. The sensors were discovered to exhibit more sensitivity of 0.07 Ω ppm−1 towards diethylamine in ∆R response and it was more sensitive towards isobutyrophenone in ∆Z response giving a sensitivity of 0.14 Ω ppm−1 while Butyraldehyde had the fastest response time of 145 s and Diethylamine had the fasted recovery time 130 s.



中文翻译:

烛烟CNPs-TiO2-PVP复合物在电阻和阻抗响应检测含醛、胺、酮官能团的挥发性有机化合物中的应用

我们使用由三种不同传感材料组成的复合传感器层制造了固态气体传感器;蜡烛烟灰碳纳米颗粒、二氧化钛和聚(乙烯基)吡咯烷酮 (PVP)。进行该研究是为了研究传感器在室温下对丁醛、二乙胺和异丁苯酮蒸气的响应。该传感器是通过分别使用比例 (2:1:3) 在二甲基甲酰胺中混合蜡烛烟灰 CNP、TiO 2和 PVP 来制备的。使用Brunauer-Emmett-Teller(BET),X射线衍射(XRD),透射和扫描电子显微镜(TEM,SEM)表征传感材料。通过注入 1 到 5 μ的体积来测量传感器的响应l 圆底玻璃中的每种液体分析物和 LCR 计用于测量 ∆R 和 ∆Z 响应。在这两个参数中,传感器对不同的分析物反应良好,传感器的响应随着分析物蒸气浓度的增加而线性增加。发现传感器在 ∆R 响应中对二乙胺表现出更高的 0.07 Ω ppm -1灵敏度,在 ∆Z 响应中对异丁苯酮更敏感,灵敏度为 0.14 Ω ppm -1而丁醛的最快响应时间为 145 秒二乙胺的空腹恢复时间为130 s。

更新日期:2021-04-22
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