(1. 東北大學(xué) 資源與土木工程學(xué)院，沈陽 110819；
2. 北京礦冶研究總院 礦物加工科學(xué)與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，北京102628)
摘 要: 采用熱蒸發(fā)法在鍍金硅藻土多孔陶瓷襯底表面合成出SnO2納米線，通過XRD、SEM、TEM和XPS等檢測(cè)手段對(duì)SnO2納米線的微觀形貌、晶體結(jié)構(gòu)及元素組成進(jìn)行分析，探討硅藻土多孔陶瓷襯底對(duì)SnO2納米線生長的影響。結(jié)果表明：該襯底上所獲產(chǎn)物為具有四方相晶體結(jié)構(gòu)的SnO2納米線，直徑為53~170 nm，長度為10 μm~ 1 mm。該硅藻土陶瓷襯底的多孔特性增加材料的成核位點(diǎn)，有利于Sn蒸氣與Au液滴的高概率融合并快速飽合析出，從而促使SnO2納米線具有高產(chǎn)率和高長徑比。氣敏檢測(cè)結(jié)果表明，在較低工作溫度條件下，基于所獲SnO2納米線的氣體傳感器對(duì)濃度為5×10-7~1×10-5(體積分?jǐn)?shù))的H2S具有優(yōu)異的氣敏特性，同時(shí)具有良好的穩(wěn)定性及選擇性。
關(guān)鍵字: 硅藻土；多孔陶瓷；二氧化錫；納米線；氣體傳感器
（1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
2. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining and Metallurgy, Beijing 102628, China）
Abstract:SnO2 nanowires (SNWs) were grown on Au-coated diatomite-based porous substrate by a thermal evaporation method. The obtained SNWs were characterized by XRD, SEM, TEM and XPS to investigate their morphology, crystallization and composition. The effect of the diatomite-based porous substrate on the growth of SNWs was discussed. It demonstrates that the obtains SNWs with tetragonal rutile structure are 53-170 nm in diameter and 10 μm-1 mm in length. The porous ceramic substrate not only increases the nucleation sites of the SNWs, but also enhances the sticking probability between Sn vapors and Au droplets as well as rapid saturation precipitation, which raises the high yield and large length-to-diameter ratio of SNWs. The sensing measurements illustrate that the gas sensor based on SNWs shows excellent gas sensing properties to the volume fraction of 5×10-7-1×10-5 H2S at low operating temperatures. Moreover, the obtained SNWs show good stability and high selectivity.
Key words: diatomite; porous ceramic substrate; SnO2; nanowire; gas sensor
