Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea.
Nanotechnology. 2010 May 28;21(21):215501. doi: 10.1088/0957-4484/21/21/215501. Epub 2010 Apr 30.
SnO(2) nanoparticle coated single wall nanotube (SWNT) network sensors were fabricated by forming a SWNT network on the Pt patterned SiO(2)/Si substrate using a dip coating method and subsequently depositing SnO(2) nanoparticles on the SWNT network by rf magnetron sputtering. Their H(2) gas sensing properties were investigated. The SnO(2)-SWNT network sensors stably and reversibly responded to H(2) gas even at room temperature and could detect H(2) gas down to 100 ppm. In addition to the low temperature detection, a remarkable finding was that the gas sensing behavior of SnO(2)-SWNT network sensors was changed from p-type to n-type with increasing SnO(2) deposition time (i.e. surface coverage of SnO(2) on SWNT). A schematic model was proposed to explain the switching of sensing behavior depending on the surface coverage of SnO(2) nanoparticles on the SWNTs.
SnO(2)纳米颗粒涂覆的单壁碳纳米管 (SWNT) 网络传感器是通过使用浸涂法在 Pt 图案化的 SiO(2)/Si 衬底上形成 SWNT 网络，然后通过射频磁控溅射在 SWNT 网络上沉积 SnO(2)纳米颗粒来制备的。研究了它们对 H(2)气体的传感性能。即使在室温下，SnO(2)-SWNT 网络传感器也能稳定且可逆地响应 H(2)气体，并且可以检测低至 100ppm 的 H(2)气体。除了低温检测外，一个显著的发现是，SnO(2)-SWNT 网络传感器的气体传感行为随着 SnO(2)沉积时间（即 SWNT 上 SnO(2)的表面覆盖率）的增加而从 p 型变为 n 型。提出了一个示意图模型来解释根据 SWNTs 上 SnO(2)纳米颗粒的表面覆盖率而改变的传感行为的开关。
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