Accurate Human Pulse Sensing Using Gold Nanoparticles Strain Devices
YunLien Hsieh1*, IChi Ni2, ChunHan Chen1, ChihHao Chiu1, ChienLin Chen1, BoHao Jiang3, JhenMing Song3, ShienDer Tzeng2, Watson Kuo1
1Physics, National Chung Hsing University, Taichung, Taiwan
2Physics, National Dong Hwa University, Hualien, Taiwan
3Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan
* presenting author:YunLien Hsieh,
In recent years, intensive researches are made in building gold nanoparticles(AuNPs) film into strain sensors.[1,2,3] . With a concise and economical way, we synthesized gold nanoparticles with 3-mercaptopropionic acid and self-assembled them into film on polydimethylsiloxane(PDMS) substrates. The AuNPs film shows large resistance change when the substrates is streched or bended, with a gauge factor about 58. With suitable packaging, AuNPs devices exhibit reproducible resistance changes depending on stress in normal direction. Human pulse is measured by attaching device onto wrist and real-time recording device resistance, which changes at most by 10%.

Keywords: Gold nanoparticle, pulse sensor