A Nanohybrid Containing Cyan-Emitting Copper Nanoclusters and TiO2 Nanoparticles: Tuning of Optoelectronic Properties

Dipayan Bairagi, Soumyajit Hazra, Kingshuk Basu, Arindam Banerjee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Nanohybrid materials are designed to cover up the weaknesses of individual components. In this current work, an environment-friendly synthesis was used to produce a cyan-emitting copper nanocluster (Cu NC) with a quantum yield of 8.7 %. This negatively charged nanocluster was successfully used to make a nanohybrid with anatase titanium dioxide mesoporous nanoparticles having Lewis-acidic pores. The nanohybrid formation was characterized by time-correlated single-photon counting studies (TCSPC), solid-state UV-visible absorption spectroscopy and valence band X-ray photoelectron spectroscopy. A systematic increase of Cu NC loading on the TiO2 showed an increase of current from a range of 10−7 A (in native TiO2) to 10−4 A (1 : 10 Cu NC-TiO2 hybrid). Interestingly, the photocurrent response of TiO2 also dramatically improved from 8.9×10−3 mA to 4.1 mA in1 : 10 Cu NC−TiO2 hybrid. Systematic variation of their weight ratio vividly demonstrated that 10 % w/w TiO2−Cu NC hybrid was the most effective current generator, keeping the semiconducting and photovoltaic nature intact. The increase in photocurrent can be attributed to the long-lived electron-hole separation in the nanohybrid system.

Original languageEnglish
Article numbere202201701
JournalChemistrySelect
Volume7
Issue number30
DOIs
StatePublished - 12 Aug 2022
Externally publishedYes

Keywords

  • copper nanocluster
  • nanohybrid
  • photocurrent
  • semiconductor
  • titanium dioxide

ASJC Scopus subject areas

  • General Chemistry

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