Nguyen Cam Phu Thi, La Phan Phuong Ha, Trinh Thanh Thuy, Le Tuan Anh Huy, Bong Sungjae, Jang Kyungsoo, Ahn Shihyun, Yi Junsin
J Nanosci Nanotechnol. 2014 Aug;14(8):6261-5. doi: 10.1166/jnn.2014.8819.
We showed well-aligned zinc oxide (ZnO) nanorod arrays synthesized using hydrothermal method at atmospheric pressure. The influence of fabrication conditions such as Zn2+/hexamethylentriamin concentration ratio, and growth temperature on the formation of ZnO nanorods was investigated. Scanning Electron Microscope (SEM) images and X-ray Diffraction (XRD) analysis were used to confirm the single crystal of ZnO nanorods, which showed wurtzite structure with growth direction of [0001] (the c-axis). Photoluminescence (PL) measurements of ZnO nanorods revealed an intense ultraviolet peak at 388.5 nm (3.19 eV) at room temperature. The results showed that the ZnO seed layers had strong influence on the growth of vertically aligned ZnO nanorods. The gas sensor based on ZnO nanorod arrays had the most selectivity with n-butanol gas (within 2 surveyed gas: ethanol and n-butanol) and showed a higher sensitivity of 222, fast response time of 15 seconds, recovery time of 110 seconds and lower operating temperature of 200-250 °C than the sensor based on the ZnO film in the same detecting conditions.
我们展示了在大气压下通过水热法合成的排列良好的氧化锌（ZnO）纳米棒阵列。研究了诸如Zn2+/六亚甲基三胺浓度比和生长温度等制备条件对ZnO纳米棒形成的影响。利用扫描电子显微镜（SEM）图像和X射线衍射（XRD）分析来确认ZnO纳米棒的单晶，其呈现出纤锌矿结构，生长方向为[0001]（c轴）。ZnO纳米棒的光致发光（PL）测量显示在室温下388.5 nm（3.19 eV）处有一个强烈的紫外峰。结果表明，ZnO籽晶层对垂直排列的ZnO纳米棒的生长有很大影响。基于ZnO纳米棒阵列的气体传感器对正丁醇气体具有最高的选择性（在所检测的两种气体：乙醇和正丁醇中），并且在相同检测条件下，与基于ZnO薄膜的传感器相比，显示出更高的灵敏度222、快速响应时间15秒、恢复时间110秒以及更低的工作温度200 - 250°C。
