101
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Achadu OJ, Uddin I, Nyokong T. The interaction between graphene quantum dots grafted with polyethyleneimine and Au@Ag nanoparticles: Application as a fluorescence “turn-on” nanoprobe. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.03.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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102
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Achadu OJ, Uddin I, Nyokong T. Fluorescence behavior of nanoconjugates of graphene quantum dots and zinc phthalocyanines. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.11.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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103
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Zhang F, Liu F, Wang C, Xin X, Liu J, Guo S, Zhang J. Effect of Lateral Size of Graphene Quantum Dots on Their Properties and Application. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2104-10. [PMID: 26725374 DOI: 10.1021/acsami.5b10602] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Well-defined graphene quantum dots (GQDs) are crucial for their biological applications and the construction of nanoscaled optoelectronic and electronic devices. However, as-synthesized GQDs reported in many works assume a very wide lateral size distribution; thus, their apparent properties cannot truthfully reflect intrinsic properties of the well-defined GQDs, and more importantly, the applications of GQDs will be affected and limited as well. In this work, we demonstrated that different sized GQDs with a narrow size distribution could be obtained via gel electrophoresis of the crude GQDs prepared through a photo-Fenton reaction of graphene oxide (GO). It is illustrated that the photoluminesce (PL) emissions of the well-defined GQDs originated mainly from the peripheral carboxylic groups and conjugated carbon backbone planes through fluorescence and UV-vis spectroscopies. More importantly, our findings challenge the notion that the excitation wavelength dependent PL property of the as-synthesized GQDs is the intrinsic property of the size-defined GQDs. Preliminary data at the cellular level indicated that the small sized GQDs exhibit weaker quenching DNA dye ability but higher toxicity to the cells compared to that of the as-synthesized GQDs. This discovery is essential to explore applications of the GQDs in pharmaceutics and to understand the origin of the optoelectronic properties of GQDs.
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Affiliation(s)
- Fangwei Zhang
- Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Fei Liu
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Chong Wang
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Xiaozhen Xin
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Jingyuan Liu
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Shouwu Guo
- Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Jingyan Zhang
- State Key Laboratory of Bioreactor Engineering, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology , Shanghai 200237, P. R. China
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104
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Achadu OJ, Nyokong T. Application of graphene quantum dots decorated with TEMPO-derivatized zinc phthalocyanine as novel nanoprobes: probing the sensitive detection of ascorbic acid. NEW J CHEM 2016. [DOI: 10.1039/c6nj01796g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nanocomposite of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl substituted zinc phthalocyanine and graphene quantum dots is a selective fluorescence sensor for ascorbic acid.
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105
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Cayuela A, Soriano ML, Carrillo-Carrión C, Valcárcel M. Semiconductor and carbon-based fluorescent nanodots: the need for consistency. Chem Commun (Camb) 2016; 52:1311-26. [DOI: 10.1039/c5cc07754k] [Citation(s) in RCA: 325] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The need for establishing the bases and definitions of photoluminescent nanodots is discussed and their state-of-the-art in analytical and biomedical research fields is highlighted.
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Affiliation(s)
- A. Cayuela
- Department of Analytical Chemistry
- University of Córdoba
- E-14071 Córdoba
- Spain
| | - M. L. Soriano
- Department of Analytical Chemistry
- University of Córdoba
- E-14071 Córdoba
- Spain
| | | | - M. Valcárcel
- Department of Analytical Chemistry
- University of Córdoba
- E-14071 Córdoba
- Spain
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106
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Abstract
Graphene quantum dots (GQDs) and carbon quantum dots (CQDs) demonstrate unique properties in the electroanalysis field, including electroresistance, electrochemiluminescence, electrochemical and photoelectrochemical sensors.
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Affiliation(s)
- Ying Yulong
- State Key Laboratory of Silicon Materials
- School of Materials Science and Engineering
- Zhejiang University
- Hangzhou
- China
| | - Peng Xinsheng
- State Key Laboratory of Silicon Materials
- School of Materials Science and Engineering
- Zhejiang University
- Hangzhou
- China
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107
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Zhou S, Xu H, Gan W, Yuan Q. Graphene quantum dots: recent progress in preparation and fluorescence sensing applications. RSC Adv 2016. [DOI: 10.1039/c6ra24349e] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This paper reviews recent activities in the preparation and fluorescence sensing applications of graphene quantum dots.
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Affiliation(s)
- Shenghai Zhou
- College of Chemistry and Chemical Engineering
- Hebei Normal University for Nationalities
- Chengde 067000
- China
- Laboratory of Environmental Science and Technology
| | - Hongbo Xu
- College of Chemistry and Chemical Engineering
- Hebei Normal University for Nationalities
- Chengde 067000
- China
- Laboratory of Environmental Science and Technology
| | - Wei Gan
- School of Natural Sciences and Humanities
- Harbin Institute of Technology
- Shenzhen 518055
- China
- Laboratory of Environmental Science and Technology
| | - Qunhui Yuan
- School of Materials Science and Engineering
- Harbin Institute of Technology
- Shenzhen 518055
- China
- Laboratory of Environmental Science and Technology
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108
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Benítez-Martínez S, Caballero-Díaz E, Valcárcel M. Development of a biosensing system for tacrine based on nitrogen-doped graphene quantum dots and acetylcholinesterase. Analyst 2016; 141:2688-95. [DOI: 10.1039/c6an00357e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The graphene quantum dot-based sensor is sensitive to reaction products resulting from acetylcholinesterase activity and it allows for the determination of tacrine acting as an enzyme inhibitor.
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Affiliation(s)
| | - E. Caballero-Díaz
- Department of Analytical Chemistry
- University of Córdoba
- E-14071 Córdoba
- Spain
| | - M. Valcárcel
- Department of Analytical Chemistry
- University of Córdoba
- E-14071 Córdoba
- Spain
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109
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Polyaniline/graphene quantum dot-modified screen-printed carbon electrode for the rapid determination of Cr(VI) using stopped-flow analysis coupled with voltammetric technique. Talanta 2015; 150:198-205. [PMID: 26838400 DOI: 10.1016/j.talanta.2015.12.016] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 12/10/2015] [Accepted: 12/10/2015] [Indexed: 11/23/2022]
Abstract
Polyaniline/graphene quantum dots (PANI/GQDs) were used to modify a screen-printed carbon electrode (SPCE) in a flow-based system. A method for rapidly determining the Cr(VI) concentrations by using stopped-flow analysis has been developed using an Auto-Pret system coupled with linear-sweep voltammetry using the PANI/GQD-modified SPCE. The GQDs, synthesized in a botton-up manner from citric acid, were mixed with aniline monomer in an optimized ratio. The mixture was injected into an electrochemical flow cell in which electro-polymerization of the aniline monomer occurred. Under conditions optimized for determining Cr(VI), wide linearity was obtained in the range of 0.1-10 mg L(-1), with a detection limit of 0.097 mg L(-1). For a sample volume of 0.5 m L, the modified SPCE can be used continuously with a sample-throughput of more than 90 samples per hour. In addition, this proposed method was successfully applied to mineral water samples with acceptable accuracy, and the quantitative agreement was accomplished in deteriorated Cr-plating solutions with a standard traditional method for Cr(VI) detection.
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110
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Wang C, Qian J, Wang K, Hua M, Liu Q, Hao N, You T, Huang X. Nitrogen-Doped Graphene Quantum Dots@SiO2 Nanoparticles as Electrochemiluminescence and Fluorescence Signal Indicators for Magnetically Controlled Aptasensor with Dual Detection Channels. ACS APPLIED MATERIALS & INTERFACES 2015; 7:26865-26873. [PMID: 26524349 DOI: 10.1021/acsami.5b09300] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We proposed a facile method to prepare the nitrogen-doped graphene quantum dots (NGQDs) doped silica (NGQDs@SiO2) nanoparticles (NPs). The NGQDs@SiO2 NPs were further explored as a versatile signal indicator for ochratoxin A (OTA) aptasensing by combination with electrochemiluminescence (ECL) and fluorescence (FL) detection. In this strategy, the core-shell Fe3O4@Au magnetic beads (MBs) acted as a nanocarrier to immobilize the thiolated aptamer specific for OTA, and the amino modified capture DNA (cDNA) was efficiently tagged with NGQDs@SiO2 NPs. The multifunctional aptasensor was thus fabricated by assembly of the NGQDs@SiO2 NPs onto the surface of Fe3O4@Au MBs through the high specific DNA hybridization between aptamer and cDNA. Upon OTA incubation, the aptamer linked with Fe3O4@Au MBs preferred to form an aptamer-OTA complex, which resulted in the partial release of the preloaded NGQDs@SiO2 NPs. The more OTA molecules in the detection system, the more NGQDs@SiO2 NPs were released into the bulk solution and the less preloaded NGQDs@SiO2 NPs were accumulated on the magnetic electrode surface. This provided a dual channel for OTA detection by combination with the enriched solid-state ECL and homogeneous FL detection. The FL assay exhibits a wide dynamic range and is more reproducible due to the homogeneous detection while the ECL assay possesses a lower detection limit and is preferable by using a cheaper instrument. One can obtain a preliminary screen from FL assay and a more accurate result from ECL assay. Integrating the virtues of dual analytical modality, this aptasensing strategy well-balanced the rapidity, sensitivity, and dynamic range, making it promising to other targets with aptamer sequences.
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Affiliation(s)
- Chengquan Wang
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Jing Qian
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Kun Wang
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Mengjuan Hua
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Qian Liu
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Nan Hao
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Tianyan You
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
| | - Xingyi Huang
- School of Food and Biological Engineering and ‡Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University , Zhenjiang 212013, People's Republic of China
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