Hydrogen sensing at room temperature with Pt-coated ZnO thin films and nanorods
Hydrogen sensing at room temperature with Pt-coated ZnO thin films and nanorods
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DOI：
10.1063/1.2136070
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发表时间：
2005-11-28
影响因子：
4
通讯作者：
Lin, J
中科院分区：
文献类型：
--
作者：
Tien, LC;Sadik, PW;Lin, J
比较了pt包覆单ZnO纳米棒和不同厚度薄膜（20 ~ 350 nm）探测氢的灵敏度。在室温下，当暴露于500ppm H-2 （N-2）中时，pt涂层的单纳米棒的电流响应比ZnO薄膜大约3倍。当使用不连续的铂涂层时，这两种类型的传感器的功耗都非常小（在nW范围内）。一旦铂涂层变得连续，操作传感器所需的电流增加到mu W范围。在我们的条件下，ZnO薄膜的最佳厚度在40-170 nm之间，在此范围内氢灵敏度下降。与薄膜相比，纳米棒传感器在氢气暴露后在空气中的恢复速度较慢，但对氢气的响应速度更快，这与前者在其表面吸附相对更多的氢气的概念一致。ZnO薄膜和纳米棒都不能探测氧气。(c) 2005年美国物理研究所。
A comparison is made of the sensitivities for detecting hydrogen with Pt-coated single ZnO nanorods and thin films of various thicknesses (20-350 nm). The Pt-coated single nanorods show a current response of approximately a factor of 3 larger at room temperature upon exposure to 500 ppm H-2 in N-2 than the thin films of ZnO. The power consumption with both types of sensors can be very small (in the nW range) when using discontinuous coatings of Pt. Once the Pt coating becomes continuous, the current required to operate the sensors increases to the mu W range. The optimum ZnO thin film thickness under our conditions was between 40-170 nm, with the hydrogen sensitivity falling off outside this range. The nanorod sensors show a slower recovery in air after hydrogen exposure than the thin films, but exhibit a faster response to hydrogen, consistent with the notion that the former adsorb relatively more hydrogen on their surface. Both ZnO thin and nanorods cannot detect oxygen. (c) 2005 American Institute of Physics.