Highly sensitive wireless H₂S gas sensors at room temperature based on CuO-SWCNT hybrid nanomaterials

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• 作者：Mohsen Asad^a ; ^b ; ^{mohsenasad@shirazu.ac.ir" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Mohammad Hossein Sheikhi^aAuthor Vitae
• 关键词：RFID tag sensor ; H2S gas sensing ; CuO-SWCNT ; Programing limit of detection
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：231
• 期：Complete
• 页码：474-483
• 全文大小：3231 K

文摘

Detection of H₂S in very low concentrations with innovative functional materials is of key importance in oil and gas industries. One approach to control the limit of detection for gas sensors is to engineer the shape of sensing nanostructures to develop high performance gas sensors. By controlling the process parameters in synthesizing of CuO nanostructures, programming the limit of detection has been obtained up to 100 ppb H₂S for CuO-SWCNT nanostructures at room temperature. Gas sensing evaluation of nanomaterials indicates the role of surface to volume ratio on the performance of the sensors. The crystalline structure, chemical composition and morphological characterization have been studied by X-ray diffraction, Furrier transform IR spectroscopy, Raman spectroscopy and field emission scanning electron microscopy. The CuO-SWCNT nanomaterials has been immobilized on top-side of commercial 13.56 MHz radio frequency identification (RFID) tag by drop-casting to produce tag sensors. Due to change in radar cross section of the fabricated wireless devices, a reduction of reflectance and shift of peak frequency toward lower values is observed by increasing the gas concentration. Repeatability and long life-time (30 days) of fabricated sensors indicate their effective potential for remote healthcare and environmental monitoring applications.