Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 23, Pages 19863-19870Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01718
Keywords
electrospinning; alginate nanofibers; Ag nanoparticles; humidity sensors; smart fabrics
Funding
- National Natural Science Foundation of China [51673103]
- Shandong Provincial Natural Science Foundation, China [ZR2017BA013]
- China Postdoctoral Science Foundation [2017M612200]
- Postdoctoral Scientific Research Foundation of Qingdao [2016007, 2016014]
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Alginate nanofibers assembled with silver nanoparticles throughout the whole nanofiber were fabricated by three steps including electrospinning of Na-alginate nanofibers, ion exchange between the sodium and silver ions, and in situ reduction of silver nanoparticles. The content, distribution, and size of the nanoparticles are controllable by tuning reaction conditions. Ag/alginate nanofibers exhibit good humidity sensitivity in a wide humidity range from 20% ambient relative humidity (RH) to 85% RH. Interestingly, these humidity sensors can be attached to a 3M-9001V mask for monitoring human breath during exercise and emotion changes, and this smart mask exhibits accurate and continuous human breath tracking, no matter how fast or slow as well as how deep or shallow is the human breathing. The obtained frequencies of respiration during normal, running, delight, and sadness conditions were 16, 13, 14, and 8 times per minute, respectively. Moreover, the signal waveform obtained under emotion changes is distinguishable, implying its potential applications in lie detection and interrogation. Thanks to this smart mask, it could accurately capture the rate and depth of respiration, providing an effective, low-cost, and convenient approach for tracking respiration, and it was utilized as smart fabrics in avoiding sleep apnea.
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