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Preparation of porphyrin/ZnO organic-inorganic hybrid and its hydrogen sensing property at low temperature

The morphology of the ZnO microbelt sensor was examined by field-emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). The diameter and length of the microbelt were 5 µm and 220 µm, respectively. The porphyrin islands height was few tens of nanometers. The fabricated sensor showed a good response to hydrogen at quite low working temperature. The mechanism of the hybrid sensor needs to be studied further in future. | Journal of Science & Technology 122 (2017) 063-066 Preparation of Porphyrin/ZnO Organic-Inorganic Hybrid and Its Hydrogen Sensing Property at Low Temperature 1 Dang Thi Thanh Le1*, Matteo Tonezzer2, Nguyen Thi Bac1, Nguyen Van Hieu1 Hanoi University of Science and Technology – No. 1, Dai Co Viet Str., Hai Ba Trung, Ha Noi, Viet Nam 2 IMEM-CNR, sede di Trento−FBK, Via alla Cascata 56/C, Povo, Trento, Italy Received: January 09, 2017; Accepted: July 06, 2017 Abstract Gas sensor based on a microbelt of ZnO coated the fluorinated tetraphenylporphyrin (H2TPPF) layer structured islands were developed for detection of H2 at low temperature. ZnO single microbelt was synthesized by thermal evaporation at 500-600 ºC, which was used to coat H2TPPF directly via supersonic molecular beam deposition (SuMBD) on the surface of ZnO microbelt for the gas sensor application. The morphology of the ZnO microbelt sensor was examined by field-emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). The diameter and length of the microbelt were 5 µm and 220 µm, respectively. The porphyrin islands height was few tens of nanometers. The fabricated sensor showed a good response to hydrogen at quite low working temperature. The mechanism of the hybrid sensor needs to be studied further in future. Keywords: Gas sensors, ZnO microbelt, porphyrin, hydrogen, hybrid. 1. Introduction * Zinc oxide is one of the most studied metal oxides and among the most promising materials for gas sensing also for its stability, safety and biocompatibility that make it suitable for a wide range of applications [3,4]. The increased surface-tovolume ratio of quasi-1D ZnO nanowires provides them a much greater response compared to bulk ZnO and ZnO thin films. The field of organic−inorganic hybrid nanocomposites is a rapidly growing area of research in advanced functional materials science [1]. These materials are made of nanoscaled organic and inorganic counterparts, where in the .