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以氯金酸和乙酰丙酮氯化锡为主要材料,通过一步水热法制备了SnO_2和Au修饰的SnO_2(Au/SnO_2)纳米粒子.使用TEM、EDS、XRD和XPS等手段对样品的形貌、组成及结构进行表征,研究了两种材料对乙醇的气敏性能.结果表明,两种纳米颗粒的尺寸都比较均一,平均直径约为9-12 nm;SnO_2为四方金红石结构,Au为面心立方结构;在Au/SnO_2样品中,Au与SnO_2的重量比为2.6%,Au元素主要以Au~0的价态存在并含有少量的Au~(3+)价态;与纯SnO_2纳米粒子相比,Au修饰可显著提高气敏元件对乙醇响应的灵敏度和选择性。
SnO_2 and Au modified SnO_2 (Au / SnO_2) nanoparticles were prepared by one-step hydrothermal method using chloroauric acid and acetylacetone stannic chloride as the main materials.The morphologies of the samples were characterized by TEM, EDS, XRD and XPS , Composition and structure of the two materials were studied.The gas sensitivities of the two materials to ethanol were studied.The results showed that the sizes of the two nanoparticles were uniform and the average diameter was about 9-12 nm.The SnO 2 was tetragonal rutile structure with Au as the surface In the sample of Au / SnO 2, the weight ratio of Au to SnO 2 is 2.6%, Au is mainly Au ~ 0 and contains a small amount of Au 3+ valence state. Compared with pure SnO 2 nanoparticles In contrast, Au modification can significantly increase the sensitivity and selectivity of the gas sensor to ethanol response.