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Carbon Dots with an Emission in the Near Infrared Produced from Organic Dyes in Porous Silica Microsphere Templates

  • Evgeniia A. Stepanidenko
  • , Ivan D. Skurlov
  • , Pavel D. Khavlyuk
  • , Dmitry A. Onishchuk
  • , Aleksandra V. Koroleva
  • , Evgeniy V. Zhizhin
  • , Irina A. Arefina
  • , Dmitry A. Kurdyukov
  • , Daniil A. Eurov
  • , Valery G. Golubev
  • , Alexander V. Baranov
  • , Anatoly V. Fedorov
  • , Elena V. Ushakova*
  • , Andrey L. Rogach
  • *Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

63 Downloads (CityUHK Scholars)

Abstract

Carbon dots (CDs) with an emission in the near infrared spectral region are attractive due to their promising applications in bio-related areas, while their fabrication still remains a challenging task. Herein, we developed a template-assisted method using porous silica microspheres for the formation of CDs with optical transitions in the near infrared. Two organic dyes, Rhodamine 6G and IR1061 with emission in the yellow and near infrared spectral regions, respectively, were used as precursors for CDs. Correlation of morphology and chemical composition with optical properties of obtained CDs revealed the origin of their emission, which is related to the CDs’ core optical transitions and dye-derivatives within CDs. By varying annealing temperature, different kinds of optical centers as derivatives of organic dyes are formed in the microsphere’s pores. The template-assisted method allows us to synthesize CDs with an emission peaked at 1085 nm and photoluminescence quantum yield of 0.2%, which is the highest value reported so far for CDs emitting at wave-lengths longer than 1050 nm.
Original languageEnglish
Article number543
JournalNanomaterials
Volume12
Issue number3
Online published5 Feb 2022
DOIs
Publication statusPublished - Feb 2022

Funding

This work was supported by the Russian Foundation for Basic Research (Project No. 18-29-19122mk), the Program Priority 2030, the Research Grant Council of Hong Kong S.A.R. (CityU 11306619), and the Science Technology and Innovation Committee of Shenzhen Municipality (JCYJ20190808181201899). Synthesis of the silica templates was financed in the framework of the state budget agreement (0040-2019-0012). E.V.U. thanks the Ministry of Science and Higher Education of the Russian Federation for financial support through the Scholarship of the President of the Russian Federation for young scientists and graduate students (CП-2180.2021.1).

Research Keywords

  • Carbon dots
  • Near infrared emission
  • Organic dyes
  • Silica microspheres
  • Template synthesis

Publisher's Copyright Statement

  • This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

RGC Funding Information

  • RGC-funded

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