Effect of solid inorganic salts on the formation of cubic-like aggregates of ZnSnO₃ nanoparticles in solventless, organic-free reactions and their gas sensing behaviors

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• 作者：Lingzhen Lu^a ; Aiqin Zhang^a ; ^b ; Yuanhua Xiao^a ; ^b ; Feilong Gong^a ; Dianzeng Jia^b ; Feng Li^a ; ^b ; ^{lifeng696@yahoo.com} ; ^{fengli@zzuli.edu.cn} ; ^{lifeng696@gmail.com}
• 关键词：ZnSnO3 nanoparticles ; Cubic-like aggregates ; Inorganic salt ; Effect ; Gas sensors
• 刊名：Materials Science and Engineering ; B
• 出版年：2012
• 期刊代码：76_09215107
• 类别：ch
• 出版时间：25 July, 2012
• 卷：177
• 期：12
• 页码：942-948
• 文件大小：2373 K

摘要

The effect of added solid inorganic salts on the morphology of ZnSnO₃ nanoparticle aggregates has been investigated based on solventless and organic-free reactions at ambient temperature. Cubic-like aggregates of ZnSnO₃ nanoparticles can be synthesized successfully through direct reaction of solid MOH (M⁺ = K⁺, Na⁺) with a solid mixture of ZnCl₂ and SnCl₄路5H₂O in the presence of added inorganic salt, MCl (M⁺ = K⁺, Na⁺). In contrast, irregular spherical aggregates of ZnSnO₃ nanoparticles are produced in the reactions in absence of added solid inorganic salts. The added solid inorganic salts, which play a key role for producing the cubic-like aggregates of ZnSnO₃ nanoparticles with pores of ca. 2.8 nm, may act as a substrate-template for the growth of nanocrystals and the formation of their cubic-like aggregates. Gas sensors are further constructed with the aggregates of ZnSnO₃ nanoparticles as sensing materials. The sensors made with the cubic-like aggregates (C-sensors) exhibit much higher responses to the reducing gases tested, compared to those (S-sensors) from spherical aggregates synthesized without adding inorganic substrate-template into the reaction. The approach could open a new pathway for controlling the microstructure of materials with high gas sensing functionality.