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Polyaniline Based Gas Sensor for NO_2 by Langmuir-Blodgett Technology

稀有金属材料与工程 2006年第A03期35卷 59-60页

作者： Yadong Jiang Guangzhong Xie School of Opto-eleetronic Information University of Electronic Science and Technology of China Chengdu 610054 China

In this paper,pure polyaniline (PAN:Emeraldine base (EB) form) films and the mixed LB films of PAN and acetic acid (AA) with various layers were prepared by Langmuir-Blodgett (LB) *** based gas sensors were fabricated by deposited PAN based LB thin films on the interdigitated *** gas-sensitivity to NO_2 of PAN based gas sensors with different layers was *** is found that pure polyaniline LB films present higher sensitivity,responsivity and reversibility to NO_2 gas compared with polyaniline and acetic acid mixed LB *** response time of 3-layer and 15-layer pure polyaniline LB films to 20μg/g NO_2 gas is about 10 s and 30 s,*** recovery time of the 15-layer pure polyaniline LB films is close to 5 min.

关键词： PAN LB interdigitated electrodes reversibility

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Micro-drop mixer Driven by Standing Surface Acoustic Waves(SSAW)

Micro-drop mixer Driven by Standing Surface Acoustic Waves(S...

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2012 International Conference on Material Sciences and Manufacturing Technology(ICMSMT 2012)

作者： Miao Baogang Wang Chaohui Zheng Tengfei Zhang Qunming Jiang Zhuangde Xi’an Jiaotong University State Key Laboratory for Manufacturing System Engineering

High-frequency surface acoustic waves(SAW) were generated and transmitted along single-crystal lithium niobate(Li Nb O3). The standing surface waves(SSAW) formed between two parallel inter-digital transducers(IDTs) on a Li Nb O3 substrate, were employed to drive the microdrop mixer. An SSAW device was designed, micro-machined and tested. When an AC signal with the frequency of 61.4MHz was applied to the IDTs, vortex appeared in the drop consisted of two incompatible liquid(ink and glycerol). The evolution of the vortex was recorded in this work. With the evolution of the vortex, mixing process of two incompatible liquid has been demonstrated. The mixer is of significant relevance for many bio-technological applications and in particular for labon-chip. While the experimental liquids were mutually incompatible, the ink could only be divided into smaller drops.

关键词： Micro-fluidic SAW interdigitated electrodes micro-drop mixer

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