White-light photosensors based on Ag nanoparticle-reduced graphene oxide hybrid materials

Wei Chen Tu, Xiang Sheng Liu, Shih Lun Chen, Ming Yi Lin, Wu Yih Uen, Yu Cheng Chen, Yu Chiang Chao

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The unique and outstanding electrical and optical properties of graphene make it a potential material to be used in the construction of high-performance photosensors. However, the fabrication process of a graphene photosensor is usually complicated and the size of the device also is restricted to micrometer scale. In this work, we report large-area photosensors based on reduced graphene oxide (rGO) implemented with Ag nanoparticles (AgNPs) via a simple and cost-effective method. To further optimize the performance of photosensors, the absorbance and distribution of the electrical field intensity of graphene with AgNPs was simulated using the finite-difference time-domain (FDTD) method through use of the surface plasmon resonance effect. Based on the simulated results, we constructed photosensors using rGO with 60-80 nm AgNPs and analyzed the characteristics at room temperature under white-light illumination for outdoor environment applications. The on/off ratio of the photosensor with AgNPs was improved from 1.166 to 9.699 at the bias voltage of -1.5 V, which was compared as a sample without AgNPs. The proposed photosensor affords a new strategy to construct cost-effective and large-area graphene films which raises opportunities in the field of next-generation optoelectronic devices operated in an outdoor environment.

Original languageEnglish
Article number655
JournalMicromachines
Volume9
Issue number12
DOIs
Publication statusPublished - 2018 Dec 11

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Keywords

  • Ag nanoparticles
  • Finite-difference time-domain
  • Photosensor
  • Reduced graphene oxide
  • Solution process

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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