Detection of hydrogen with SnO2-coated ZnO nanorods

作者：Tien L C; Norton D P; Gila B P; Pearton S J^*; Wang Hung Ta; Kang B S; Ren F

来源：Applied Surface Science, 2007, 253(10): 4748-4752.

DOI：10.1016/j.apsusc.2006.10.056

• hydrogen
• sensors
• ZnO
• nanorods

SnO2-coated ZnO nanorods on c-plane sapphire substrates were synthesized by pulsed laser deposition. The thickness of the polycrystalline SnO2 Was similar to 10 nm, as determined by high-resolution transmission electron microscopy, while the diameter of the ZnO nanorods was similar to 30 nm. The sensitivity of the SnO2/ZnO structures to hydrogen was tested by depositing Ti/Au Ohmic contacts on a random array of the nanorods and measuring the current at fixed voltage. There was no response to 500 ppm H-2 in N-2 at room temperature, but we obtained a sensitivity of similar to 70% at 400 degrees C. The SnO2/ZnO structures exhibit drift in their recovery characteristics and for sequential detection of hydrogen, as generally reported for SnO2 thin film sensors.

• 出版日期2007-3-15