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Transparent Photothermal Heaters from a Soluble NIR‐Absorbing Diimmonium Salt
Author(s) -
Han Minsu,
Kim Byeonggwan,
Lim Hanwhuy,
Jang Hwandong,
Kim Eunkyoung
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905096
Subject(s) - materials science , photothermal therapy , transmittance , optoelectronics , absorption (acoustics) , bending , evaporation , actuator , salt (chemistry) , visible spectrum , colored , polymer , photothermal effect , composite material , optics , chemical engineering , nanotechnology , chemistry , physics , engineering , electrical engineering , thermodynamics
While numerous near‐infrared (NIR) materials have emerged, most of them are strongly colored or black due to the absorption band or tails in the visible region. Here, a highly transparent and soluble NIR‐absorbing ionic salt, isobutyl‐substituted diimmonium borate (IDI), is synthesized and fabricated, through a solution process, as a thin film that shows a transmittance of over 93% in the whole visible region. A transparent photothermal (PT) film heater is fabricated with the IDI‐doped polymer solution, which shows a photothermal conversion efficiency (η PT ) of 75.2%. Additionally, the prepared PT heater shows a high water evaporation conversion efficiency (η w ) of 68.8% upon exposure to a 1064 nm laser. Furthermore, the transparent IDI film affords the development of a wireless transparent actuator for the first time, generating a bending angle over 75°, with over 2700 bending cycles. The transparent IDI film creates a hot transparent Venus flytrap and a colorful or fluorescent actuator upon the addition of colorants without losing the actuation properties.