Cited 4 time in webofscience Cited 7 time in scopus

Silver fractal dendrites for highly sensitive and transparent polymer thermistors

Title
Silver fractal dendrites for highly sensitive and transparent polymer thermistors
Authors
Kim, JongyounLee, DonghwaPark, KyutaeGoh, HyeonjinLee, Youngu
DGIST Authors
Kim, Jongyoun; Lee, Donghwa; Park, Kyutae; Goh, Hyeonjin; Lee, Youngu
Issue Date
2019-09
Citation
Nanoscale, 11(33), 15464-15471
Type
Article
Article Type
Article
Keywords
REDUCED GRAPHENE OXIDETEMPERATURE SENSORSFABRICATION
ISSN
2040-3364
Abstract
Effective temperature measurement using non-invasive sensors finds applications in virtually every field of human life. Recently, significant efforts have been made toward developing polymer positive temperature coefficient (PTC) thermistors because they have advantages including flexibility, conformability, and biocompatibility. However, most polymer PTC thermistors still have issues such as low sensitivity, low optical transparency, and poor operational durability because of low electrical conductivity and inefficient hopping transport of conventional conductive filler. Here, a highly sensitive and transparent polymer thermistor composed of silver fractal dendrites (AgFDs) and a polyacrylate (PA) matrix has been successfully demonstrated. A AgFDs-PA composite film exhibits a superior PTC effect (about 104 Ω °C-1) around 35 °C because of the high electrical conductivity of the AgFDs and the quantum tunneling effect among them. A thermistor based on the AgFDs-PA composite shows excellent sensitivity, PTC intensity (∼107), and sensing resolution through dramatic resistance changes from thousands to billions of ohms in the human body temperature range (34-37 °C). Moreover, it exhibits excellent optical transparency (82.14%), mechanical flexibility, and operational durability. An electrical impedance spectroscopy analysis shows that the distance between the AgFDs increases with temperature, which implies that the quantum tunneling effect amplified by the branches of the AgFDs has a significant influence on the changes in resistance. This characteristic makes the thermistor immediately suitable for monitoring body temperature. We anticipate that the new thermistor based on the AgFDs-PA composite can be a key component of various sensing applications. © The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/10647
DOI
10.1039/c9nr04233d
Publisher
Royal Society of Chemistry
Related Researcher
  • Author Lee, Youngu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지
Files:
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Collection:
Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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