Liquid phase IR detector based on the photothermal effect of reduced graphene oxide-doped liquid crystals

Mohammad A. Adeshina, Hakseon Lee, Bharath Kumar Mareddi, Daekyung Kang, Abdulazeez M. Ogunleye, Hyunmin Kim, Taewan Kim, Muhan Choi, Hongsik Park, Jonghoo Park

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Owing to the additional functionalities endowed by nanoparticle dopants, liquid crystals doped with nanoparticles are promising optical materials in a wide range of applications. In this study, we exploited the photothermal effect of reduced graphene oxide (rGO)-doped 5CB nematic liquid crystals (LC-rGO) to develop an infrared (IR) detector that is not only sensitive to IR but also measures the temperature and energy deposited in the detector. We demonstrate that rGO doping in LCs significantly enhances the IR absorption and transforms the light energy into thermal energy through the photothermal effect. The changes in the orientational order and birefringence of the LC-rGO induced by the photothermal effect under IR irradiation were manifested as an instantaneous color change in the white light probe beam. The change in the probe beam intensity was further translated into a temperature change and energy deposited in the detector. We also demonstrated that the external voltage applied to the detector significantly amplifies the photothermal responsivity by compensating for the anchoring energy of the LC. This study proposes a novel technology for detecting IR, temperature, and energy deposited in the detector by means of visible light, which has significant potential for developing large-area and high-resolution IR detectors by exploiting mature liquid crystal display technologies.

Original languageEnglish
Pages (from-to)2061-2066
Number of pages6
JournalNanoscale
Volume15
Issue number5
DOIs
StatePublished - 3 Jan 2023

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