Contact-controlled sensing properties of flowerlike ZnO nanostructures
Contact-controlled sensing properties of flowerlike ZnO nanostructures
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DOI：
10.1063/1.2135391
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发表时间：
2005-11-21
影响因子：
4
通讯作者：
Wang, TH
中科院分区：
文献类型：
--
作者：
Feng, P;Wan, Q;Wang, TH
接触控制传感是通过由棒组成的花状氧化锌结构实现的。这些棒的直径约为 150 nm，长度可达几微米。当它们暴露在空气中时，由于氧气的吸附，在棒的表面下方形成了耗尽区。表面耗尽不会大大降低棒中的载流子密度或迁移率，但会显着改变棒之间接触的势垒。大直径和长长度使得传感器电阻在 300 摄氏度的空气中低至 104 k Omega。隧道速率随着接触势垒的厚度和高度呈指数增加，导致对于 100 ppm 乙醇的灵敏度高达 14.6。这些结果表明接触控制传感可用于制造具有高灵敏度和低电阻的高性能传感器。 (c) 2005 年美国物理研究所。
Contact-controlled sensing is realized from flowerlike ZnO structures composed of rods. The rods are around 150 nm in diameter and up to a few micrometers in length. When they are exposed to air, a depletion region formed below the surface of the rods arising from the adsorption of oxygen. Surface depletion does not greatly reduce either the carrier density or the mobility in the rods but significantly modify the potential barrier of the contacts between the rods. Both the large diameter and the long length result in a low sensor resistance down to 104 k Omega in air at 300 degrees C. The exponential increase of the tunneling rate with the thickness and height of the contact barrier leads to a high sensitivity up to 14.6 for 100 ppm ethanol. These results indicate that contact-controlled sensing can be used to fabricate high-performance sensors with both high sensitivity and low resistance. (c) 2005 American Institute of Physics.