Heating Characteristics of Transparent Films Prepared with Conductive Composite Materials
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00267-z
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Heating Characteristics of Transparent Films Prepared with Conductive Composite Materials Yun‑Hyeong Choi1 · Weontae Oh1 Received: 14 August 2020 / Revised: 4 November 2020 / Accepted: 9 November 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract Transparent heating film was fabricated with the conductive coating solution including silver nanowire and graphene oxide. Visible transmittance, electric resistance, and heating temperature were analyzed on the as-prepared film. Transparent heating film was fabricated with a resistance value of 100 Ω or less, and the visible transmittance was adjusted at a level of 90% or less according to the loading of Ag nanowire. The heating temperature was stably increased throughout the film up to 100 °C or more in proportion to the applied DC voltage. Keywords Conductive composite · Graphene oxide · Silver nanowire · Transparent film · Heating
1 Introduction Heating film is a heating element that generates thermal energy from the film surface, based on the principle of Joule heating (also known as Ohmic heating) [1]. When copper electrodes are attached to both ends of a heating film and a rated voltage is applied on the film, thermal energy is generated over the entire surface of the film. Generally, a heating film converts electric energy into thermal energy, resulting in thermal radiation. The transparent heating film is fabricated by depositing a conductive solution on an electrodepatterned transparent substrates such as glass and PET film. The physical status of an as-prepared heating film can be rigid or flexible according to the substrate type to be used. Transparent heating film is highly utilized to remove frost and condensation in automotive and building windows that require high visible transparency. Transparent heating film is expected to be an excellent substitute to overcome the disadvantages of conventional and opaque heating-wired products, in which heating temperature is not uniform, and electric power consumption is high. Even worse, fire and burn risks are frequent in the wired heating products. Thin films fabricated from inorganic oxide materials such as ITO, In2O3, and SnO2 can be used to realize high * Weontae Oh [email protected] 1
Division of Advanced Materials Engineering, Dong-Eui University, Busan 47340, Korea
transparency and surface radiation in the visible light region [2–4]. However, these inorganic oxide thin films are brittle and limited in structural shaping, and is processed using a vapor deposition method in a high-temperature and vacuum state. Alternatively, the use of conductive polymers and carbon-based materials such as graphene and carbon nanotubes can be considered. These materials have a high light absorptivity and thus must be fabricated within a limited thickness, but they are expected to be applied to flexible devices due to the characteristic flexibility. Especially, graphene i
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