• XIAMENG LI

      Articles written in Bulletin of Materials Science

    • A fluorescence labelling and switchable nanosensor based on nitrogen-doped graphene quantum dots

      FENG XIE TING WANG XIAMENG LI DA CHEN CHANGXING WANG GANG WANG XIAOHU ZHENG QINGLEI GUO

      More Details Abstract Fulltext PDF

      In this study, we report a switchable fluorescence probe based on nitrogen-doped graphene quantum dots (N-GQDs) to detect the presence of tetracycline and L-Cystence. Strong blue emissive N-GQDs were successfullyprepared by the hydrothermal treatment of urea and benzophenone, with a quantum yield of 34.9%. Both transmission electron microscopy and atomic force microscope images reveal a nearly monodispersed N-GQDs with spherical morphologies, and provide evidences of 1–3 layered structures of N-GQDs. Meanwhile, the obtained N-GQDs can be utilized for fluorescent labelling due to their superior optical stability and favourable biological compatibility. A strong fluorescence quenching was observed for the presence of tetracycline. The following addition of L-Cysteine can motivate the regeneration of fluorescence. Therefore, a simple strategy for the detection of tetracycline and L-Cystence in natural water was developed due to the relevant sensitivity of N-GQDs nanosensor.

    • Large-scale synthesis of dual sensing nitrogen-doped graphene quantum dots for real-time detection of pH and antibiotic

      XIAMENG LI YUN ZHAO TINGTING LI GUOQIANG GUO YIRU WANG XU WANG JINGZHENG YANG DA CHEN

      More Details Abstract Fulltext PDF

      Recently, graphene quantum dots (GQDs) with bright fluorescence have emerged as a novel carbon nanomaterial because of their distinctive optical properties and robust chemical inertness. Herein, a simple bottom-upapproach is used to prepare nitrogen-doped GQDs (N-GQDs) by using citric acid as the carbon source and tris (hydroxymethyl) aminomethane (Tris) as the nitrogen source. The prepared N-GQDs have a high yield of 61.50% and the quantum yield is 14.42%. Meanwhile, the N-GQDs exhibit clearly fluorescence quenching with the increase of pH value from 3.0 to 12.0. In addition, the N-GQDs possess excellent fluorescence quenching response to tetracycline (TC) due to the inner filter effect. And the fluorescence intensity of N-GQDs exhibits a good linear relationship with the addition of TC in range of 1–50 ${\mu}$M. The detection limit is determined to be 94 nM. Furthermore, the smartphone-based handheld device is developed to track the fluorescence colour changes caused by the variation of pH and TC. Through analysing the RGB values from the fluorescence images, good linearity betweenRGB values and pH values is obtained ($R^2$ = 0.996), while the detection limit for TC detection is 97 nM. This method has been shown to be effective and reliable along with great promise for real-time visual monitoring of pH and TC values in real samples.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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