【摘 要】
：
Semiconductor oxides with hierarchically hollow or porous architectures are considered to be the ideal structure for the gas-sensing applications due to their efficiently high surface area and surface
【出 处】
：
2012 Postdoctoral Symposium of China on Materials Science &
论文部分内容阅读
Semiconductor oxides with hierarchically hollow or porous architectures are considered to be the ideal structure for the gas-sensing applications due to their efficiently high surface area and surface accessibility.Designed assembly of hierarchical nanostructures with well-defined shapes is of great scientific and practical value and remains a great challenge via a facile and low-cost method.This paper presents a new type of hierarchical ZnSnO3-SnO2 flower-shape nanostructure composed of thin nanoflakes as secondary units, which is successfully prepared through a simple hydrothermal process.The polyhedral ZnSnO3 core acts as a partially sacrificed template for the growth of hierarchical SnO2 nanoflakes, and the average thickness of SnO2 nanoflakes is around 25 nm.The time-dependent morphology evolution of ZnSnO3-SnO2 samples has been investigated, and a possible formation mechanism of these hierarchical structures is discussed.Moreover, the gas-sensing performance of these ZnSnO3-SnO2 nanostructures to ethanol (C2H5OH) is investigated.Due to their efficiently high surface area of hierarchical architecture and the coexisted ZnSnO3-SnO2 phases, these ZnSnO3-SnO2 nanostructures exhibit higher response, faster response-recovery, and other batter sensing characteristics to C2H5OH compared with the pure ZnSnO3 or SnO2 nanostructures.It is found that ZnSnO3-SnO2 nanoflakes have a response of 27.8 to 50 ppm C2H5OH at the optimal operating temperature of 270 ℃, and the response and recovery time are within 1.0 and 1.8 s, respectively.
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