Highly sensitive gas sensor enhanced by tuning the surface potential
Highly sensitive gas sensor enhanced by tuning the surface potential
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DOI：
10.1016/j.orgel.2011.09.014
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发表时间：
2011-12-01
影响因子：
3.2
通讯作者：
Yan, Donghang
中科院分区：
文献类型：
--
作者：
Wang, Xiujin;Ji, Shiliang;Yan, Donghang
我们报告了一种异质结气体传感器，它对低于5 ppm的二氧化氮（NO2）有增强的相对响应，在室温下检测限低至250 ppb。以1.8 nm的钛基酞菁（TiOPc）薄膜为底层，1 nm的六氟化铜酞菁（F16CuPc）薄膜为顶层，构建了超薄双层传感器器件。开尔文探针力显微镜（KPFM）结果表明，在界面处形成了p-n异质结。顶层形成了局部电子聚集区，使薄膜对分析物的还原性增强。顶层作为晶界之外的额外表面活性位点，这些异质结构可以更有效地吸附分析物。(C) 2011 Elsevier B.V.版权所有
We report a heterojunction gas sensor with an enhanced relative response to nitrogen dioxide (NO2) below 5 ppm and a detection limit down to 250 ppb at room temperature. The 1.8 nm titanyl phthalocyanine (TiOPc) film as bottom layer with 1 nm hexadecafluorinated copper phthalocyanine (F16CuPc) film as top layer has constructed an ultrathin bilayer sensor device. Kelvin probe force microscopy (KPFM) results indicated that p-n heterojunction was formed at the interface. The top layer has formed local electron accumulating area and made the film more reductive to analyte. The top layer acts as extra surface active sites in addition to the grain boundaries and these heterostructures can adsorb analytes more effectively. (C) 2011 Elsevier B.V. All rights reserved.