【[Langmuir]】Humidity-responsive Gold Aerogel for Real Time Monitoring of Human Breath
writer：Ali, I.; Chen, L.; Huang, Y.*; Song, L.; Lu, X.; Liu, B.; Zhang, L.; Zhang, J.; Hou, L.; Chen, T*
keywords：Gold Aerogel
source：期刊
specific source：Langmuir
Issue time：2018年
Humidity sensor
has received considerable attention in recent years because of its significance
and wide applications in agriculture, industries, goods stores and medical fields.
However, the conventional humidity sensors usually possessed the complexed sensing
mechanism, low sensitivity, and required a time-consuming, labor-intensive
process. The exploring an ideal sensing material to amplify the sensitivity of
humidity sensor is still a big challenge. Herein, we developed a simple, low-cost
and scalable fabrication strategy to construct a highly sensitive humidity
sensor based on polymer/gold
nanoparticles (AuNPs) hybrid materials. The hybrid polymer/AuNPs aerogel was
prepared by a simple freeze-drying method. By taking the advantage of conductivity of AuNPs and high surface area
of highly porous structure, the hybrid poly-N-isopropylacrylamide (PNIPAm)/AuNPs
aerogel showed high sensitivity to water molecules. Interestingly, the hybrid
PNIPAm/AuNPs aerogel based humidity sensor can be used to detect human breath in
different states such as normal breath, fast breath and deep breath, or by
different individuals such as person in illness, smoking and normal, which is
promising in practical flexible wearable devices for human health monitoring.
In addition, the humidity sensor can be used in whistle
tune recognition.