Oh Kyung Hee, Park Hyung Ju, Kang Shin Wook, Park Ji Chan, Nam Ki Min
Department of Chemistry, Mokpo National University, 1666 Yeongsan-ro, Cheonggye-myeon, Muan-gun, Jeonnam 58554, Republic of Korea.
Bio-Medical IT Convergence Research Department, Electronic and Telecommunications Research Institute (ETRI), Daejeon 34129, Republic of Korea.
J Nanosci Nanotechnol. 2018 Feb 1;18(2):1356-1360. doi: 10.1166/jnn.2018.14925.
Hollow nanomaterials have attracted great interest because of their many applications in catalysis, nanoreactors, drug delivery systems, for lubrication and in gas sensors. Here, carbon sphere templates were prepared from glucose under hydrothermal conditions to facilitate the synthesis of hollow Fe2O3 nanospheres. Thermal decomposition of an iron precursor in benzylalcohol with the carbon spheres resulted in the deposition of Fe3O4 nanoparticles on the carbon sphere templates. The nanoparticles on the carbon surface naturally agglomerate and form a dense oxide shell during the calcination step, which produces typical Fe2O3 hollow structures. The gas sensing performance of the hollow Fe2O3 nanospheres was investigated at an operating temperature of 300 °C. The hollow Fe2O3 nanospheres showed high sensitivity (R = 10.766 at 1 ppm formaldehyde) with a linear response to formaldehyde gas concentration in the range of 0.8~2.4 ppm, and good selectivity to formaldehyde gas in volatile organic compounds, compared to commercial Fe2O3 nanoparticles.
中空纳米材料因其在催化、纳米反应器、药物递送系统、润滑和气体传感器等众多领域的应用而备受关注。在此，通过水热条件下由葡萄糖制备碳球模板，以促进中空Fe₂O₃纳米球的合成。铁前驱体在苯甲醇中与碳球发生热分解，导致Fe₃O₄纳米颗粒沉积在碳球模板上。在煅烧步骤中，碳表面的纳米颗粒自然团聚并形成致密的氧化物壳，从而产生典型的Fe₂O₃中空结构。在300℃的工作温度下研究了中空Fe₂O₃纳米球的气敏性能。与市售Fe₂O₃纳米颗粒相比，中空Fe₂O₃纳米球表现出高灵敏度（在1 ppm甲醛下R = 10.766），对0.8~2.4 ppm范围内的甲醛气体浓度具有线性响应，并且对挥发性有机化合物中的甲醛气体具有良好的选择性。
