Korea University Functional Nanostructured Materials Laboratory Advisor: Jong-Heun Lee Trimodally porous SnO 2 nanospheres for highly sensitive gas sensing of ethanol Ji-Wook YOON 1 , Seung Ho CHOI 1 , Jun-Sik KIM 1 , Ho Won JANG 2 , Yun Chan KANG 1 and Jong-Heun LEE 1, * 1 Department of Materials Science & Engineering, Korea University, Seoul 136-713, Korea 2 Deparment of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea Korea-USA Nano-forum, Il-san, Korea NPG ASIA MATER , 8, e244 (2016)
Introduction (Applications) Porous Nanostructures Batteries Membranes Bioglass Gas sensors - High surface area - Rapid mass transfer Korea-USA Nano-forum, Il-san, Korea NPG ASIA MATER , 8, e244 (2016)
Introduction (Gas sensors) Porous Gas sensors structures Gas response can be enhanced ! Excellent platform Reaction between for highly sensitive and analyte gas and sensing selective gas sensors material can be (S = R a /R g or R g / R a ) enhanced ! Korea-USA Nano-forum, Il-san, Korea NPG ASIA MATER , 8, e244 (2016)
Introduction (Pore size effects) Micropores Mesopores Macropores < 2 nm 2 ~ 50 nm > 50 nm Surface diffusion Knudsen diffusion Molecular diffusion (< several nm) (< several tens of nm) (> 100 nm) High surface area Low surface area Low gas accessibility High gas accessibility Porous materials with multimodal pores are advantageous for gas sensing ! Korea-USA Nano-forum, Il-san, Korea NPG ASIA MATER , 8, e244 (2016)
Introduction (This work) One-pot synthesis via Porous SnO 2 spheres with 3-D Materials spray pyrolysis interconnected trimodal pores No pore Dense Porosity ↑ Connectivity ↓ Bimodal Porosity ↑ CO 2 generation Nanopore (~3 nm) Connectivity ↑ CNT template Mesopores (~20 nm) PS template Macropores (~100 nm) Trimodal Suggestion of a new and novel porous structure for ultrasensitive gas sensing ! Korea-USA Nano-forum, Il-san, Korea NPG ASIA MATER , 8, e244 (2016)
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