PVDF-triggered multicolor fluorine-doped graphene quantum dots for water detection and anti-counterfeiting

Changxing Wang; Da Chen; Siyuan Tang; Yongsheng Yang; Xiameng Li; Feng Xie; Qinglei Guo

doi:10.1007/s00604-021-05108-1

PVDF-triggered multicolor fluorine-doped graphene quantum dots for water detection and anti-counterfeiting

Mikrochim Acta. 2021 Dec 3;189(1):6. doi: 10.1007/s00604-021-05108-1.

Authors

Changxing Wang¹, Da Chen², Siyuan Tang¹, Yongsheng Yang¹, Xiameng Li¹, Feng Xie¹, Qinglei Guo^{3

4}

Affiliations

¹ Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, 315211, People's Republic of China.
² Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, 315211, People's Republic of China. chenda@nbu.edu.cn.
³ School of Microelectronics, Shandong University, Jinan, 250100, People's Republic of China. qlguo@sdu.edu.cn.
⁴ State Key Laboratory of ASIC and Systems, Fudan University, Shanghai, 200433, People's Republic of China. qlguo@sdu.edu.cn.

PMID: 34862573
DOI: 10.1007/s00604-021-05108-1

Abstract

Fluorescent fluorine-doped graphene quantum dots (F-GQDs) have been synthesized via the hydrothermal method using long-chain polymer polyvinylidene fluoride (PVDF) as the precursor. Due to the unique molecular structure of PVDF, a possible synthesis process of F-GQDs has been put forward. F-GQDs have adjustable emission wavelength by simply adjusting the concentration of the solution. As the concentration increases, the emission wavelength of F-GQDs gradually red shifts from 455 nm (blue) to 551 nm (yellow-green). In addition, F-GQDs also exhibit a sensitive fluorescence response to water content in organic solvents, and the ultralow detections limit are 0.056% in ethanol and 0.124% in DMF. Besides, due to strong UV absorption capacity, a photothermal film is fabricated by embedding F-GQDs in PDMS. The temperature of F-GQDs/PDMS polymer film can reach 33.4 ^oC under simulated sunlight, while the maximum temperature of blank PDMS film only reach 29.4 ^oC. Based on this phenomenon, a new type of anti-counterfeiting device is designed by combining F-GQDs/PDMS film with temperature change ink.

Keywords: Anti-counterfeiting; F-GQDs; Photothermal film; Tunable fluorescence; Water sensor.