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Tan W, Yao G, Yu H, He Y, Lu M, Zou T, Li X, Yin P, Na P, Yang W, Yang M, Wang H. Ultra-trace Ag doped carbon quantum dots with peroxidase-like activity for the colorimetric detection of glucose. Food Chem 2024; 447:139020. [PMID: 38513477 DOI: 10.1016/j.foodchem.2024.139020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/29/2024] [Accepted: 03/10/2024] [Indexed: 03/23/2024]
Abstract
Carbon quantum dots (CQDs) have significant applications in nanozymes. However, previous studies have not elucidated the structure-activity relationship and enzyme mechanism. In this study, we employed a one-step microwave method to synthesize ultra-trace Ag-doped carbon quantum dots (Ag-CQDs). In the presence of hydrogen peroxide (H2O2), we used the oxidative coupling reaction of 3,3',5,5'-tetramethylbenzidine (TMB) to evaluate the intrinsic peroxidase-like activity, kinetics, and mechanism of Ag-CQDs. The trace amount of doped Ag (1.64 %) facilitated electron transfer from the CQDs interior to the surface. The electron transfer triggered the peroxide activity of CQDs, producing hydroxyl radical (·OH), which oxidized the colorless TMB to blue-colored TMB (oxTMB). By coupling with glucose oxidase (GOx), the Ag-CQDs/H2O2/TMB system has been used for colorimetric glucose determination. The system demonstrated a low detection limit (0.17 µM), wide linear range (0.5-5.5 µM), and satisfactory results when fruit juice was analyzed. This study reports a feasible method for the colorimetric detection of glucose by synthesizing ultra-trace Ag-doped carbon quantum dots with peroxidase-mimicking activity.
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Affiliation(s)
- Wei Tan
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Guixiang Yao
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Hang Yu
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Yanzhi He
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Mingrong Lu
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Tianru Zou
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Xiaopei Li
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Pengyuan Yin
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Pei Na
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China
| | - Wenrong Yang
- School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Victoria 3216, Australia
| | - Min Yang
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China.
| | - Hongbin Wang
- School of Chemistry and Environment, Yunnan Minzu University, Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, Kunming 650500, PR China.
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2
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Zhao F, Liu Z, Sui S, Huang K, Yang Y, Chen Z, Yin H. Surficial amino groups coupling induced concentration-dependent fluorescence and fluorescence quantum yield of nitrogen-dopped carbon quantum dots via efficient charge transfer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 294:122542. [PMID: 36848858 DOI: 10.1016/j.saa.2023.122542] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 02/09/2023] [Accepted: 02/19/2023] [Indexed: 06/18/2023]
Abstract
Modification of surficial functional groups among carbon quantum dots (CQDs) has been considered an efficient approach to regulate the fluorescence emission of CQDs. However, the mechanism of how surficial functional groups affect fluorescence is vague which fundamentally limits the further applications of CQDs. Here we report the concentration-dependent fluorescence and fluorescence quantum yield of nitrogen-dopped carbon quantum dots (N-CQDs). At high concentrations (≥0.188 g/L), fluorescence redshift occurs accompanied with decrease in fluorescence quantum yield. Fluorescence excitation spectra and HOMO-LUMO energy gaps calculations show that energy levels of excited states of N-CQDs are relocated via the coupling of surficial amino groups among N-CQDs. Furthermore, electron density difference maps and broadened fluorescence spectra obtained from both experimental measurement and theoretical calculation further confirm that the coupling of surficial amino groups dominates the fluorescence property and verify the formation of charge-transfer state of N-CQDs complex at high concentrations which provides pathways for efficient charge transfer. Given that charge-transfer state induced fluorescence loss and fluorescence spectra broadening are the typical characteristics of organic molecules, CQDs exhibit the optical properties of both quantum dots and organic molecules.
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Affiliation(s)
- Fengjiao Zhao
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China
| | - Zhaoshuang Liu
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China
| | - Shuxin Sui
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China
| | - Kai Huang
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China
| | - Yang Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhen Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Hongming Yin
- School of Science, Dalian Maritime University, Dalian, Liaoning 116026, China
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3
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Egorova M, Tomskaya A, Smagulova SA. Optical Properties of Carbon Dots Synthesized by the Hydrothermal Method. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16114018. [PMID: 37297152 DOI: 10.3390/ma16114018] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/12/2023] [Accepted: 05/25/2023] [Indexed: 06/12/2023]
Abstract
In this study, the optical and structural properties of carbon dots (CDs) synthesized using a hydrothermal method were investigated. CDs were prepared from various precursors such as citric acid (CA), glucose, and birch bark soot. The SEM and AFM results show that the CDs are disc-shaped nanoparticles with dimensions of ~7 nm × 2 nm for CDs from CA, ~11 nm × 4 nm for CDs from glucose, and ~16 nm × 6 nm for CDs from soot. The TEM images of CDs from CA showed stripes with a distance of 0.34 nm between them. We assumed that the CDs synthesized from CA and glucose consisted of graphene nanoplates located perpendicular to the disc plane. The synthesized CDs contain oxygen (hydroxyl, carboxyl, carbonyl) and nitrogen (amino, nitro) functional groups. CDs have strong absorption in the ultraviolet region in the range of 200-300 nm. All CDs synthesized from different precursors displayed bright luminescence in the blue-green region of the spectrum (420-565 nm). We found that the luminescence of CDs depended on the synthesis time and type of precursors. The results show that the radiative transitions of electrons occur from two levels with energies ~3.0 eV and ~2.6 eV, which are due to the presence of functional groups.
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Affiliation(s)
- Marfa Egorova
- Institute of Physics and Technologies, North-Eastern Federal University, 677000 Yakutsk, Russia
| | - Aleksandra Tomskaya
- Institute of Physics and Technologies, North-Eastern Federal University, 677000 Yakutsk, Russia
- Laboratory of Spectroscopy of Nanomaterials, A.M. Prokhorov General Physics Institute, RAS, 119991 Moscow, Russia
- Phystech School of Electronics, Photonics and Molecular Physics, Moscow Institute of Physics and Technology, 141701 Dolgoprudny, Russia
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Tomskaya A, Asanov IP, Yushina I, Rakhmanova MI, Smagulova S. Optical Properties of Tricarboxylic Acid-Derived Carbon Dots. ACS OMEGA 2022; 7:44093-44102. [PMID: 36506125 PMCID: PMC9730746 DOI: 10.1021/acsomega.2c05503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 11/04/2022] [Indexed: 06/17/2023]
Abstract
Herein, we report the characterization of two types of luminescent carbon dots (CDs) synthesized by the hydrothermal treatment of citric acid and trans-aconitic acid by using ammonia solution as a nitrogen dopant. The lateral size range of nanoparticles for CDs lies in the range of 3-15 nm. The intense blue photoluminescence (PL) was emitted by the CDs at around 409-435 nm under the excitation of 320 nm. The PL quantum yield of the synthesized CDs ranged from 26.4 to 51%. Our results of the structural and optical properties of CDs imply that molecular fluorophores are an important part of the structure; in particular, the main contribution to the PL is carried by the fluorophores based on citrazinic acid derivatives, which formed during the synthesis of CDs.
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Affiliation(s)
- Aleksandra Tomskaya
- A.M.
Prokhorov General Physics Institute, RAS, Moscow 119991, Russia
- Moscow
Institute of Physics and Technology, Dolgoprudny 141701, Russia
- North-Eastern
Federal University, Yakutsk 670000, Russia
| | - Igor P. Asanov
- Nikolaev
Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia
| | - Irina Yushina
- Nikolaev
Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia
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Xiang Z, Jiang Y, Cui C, Luo Y, Peng Z. Sensitive, Selective and Reliable Detection of Fe 3+ in Lake Water via Carbon Dots-Based Fluorescence Assay. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27196749. [PMID: 36235283 PMCID: PMC9573028 DOI: 10.3390/molecules27196749] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/06/2022] [Accepted: 10/06/2022] [Indexed: 11/17/2022]
Abstract
In this study, C-dots were facilely synthesized via microwave irradiation using citric acid and ethylenediamine as carbon precursors. The fluorescence emissions of the C-dots could be selectively quenched by Fe3+, and the degree of quenching was linearly related to the concentrations of Fe3+ presented. This phenomenon was utilized to develop a sensitive fluorescence assay for Fe3+ detection with broad linear range (0–250, 250–1200 μmol/L) and low detection limit (1.68 μmol/L). Most importantly, the assay demonstrated high reliability towards samples in deionized water, tap water and lake water, which should find potential applications for Fe3+ monitoring in complicated environments.
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Affiliation(s)
- Zhuang Xiang
- School of Materials and Energy, Yunnan University, Kunming 650091, China
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, Yunnan University, Kunming 650091, China
| | - Yuxiang Jiang
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Chen Cui
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Yuanping Luo
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Zhili Peng
- School of Materials and Energy, Yunnan University, Kunming 650091, China
- Correspondence: ; Tel.: +86-871-65037399
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Wang C, Huang G, Luo X, Tang W, Yue T, Li Z. Construction of ratiometric fluorescence sensor and test strip with smartphone based on dual-emission carbon dots for the specific detection of chlortetracycline. Anal Bioanal Chem 2022; 414:8143-8154. [PMID: 36194240 DOI: 10.1007/s00216-022-04349-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/06/2022] [Accepted: 09/20/2022] [Indexed: 11/30/2022]
Abstract
Concerns about environmental and food contamination caused by chlortetracycline (CTC) residues have prompted people to explore efficient and convenient CTC monitoring platforms. However, the reported fluorescent probes generally fail to selectively detect CTC due to the structural similarity of tetracycline antibiotics. Herein, an intrinsic dual-emission carbon dots (D-CDs) ratiometric fluorescence sensor was prepared for highly sensitive and selective determination of CTC over other tetracyclines by one-step synthesis. The sensor exhibited a significant fluorescence enhancement at 425 nm after introducing CTC. The fluorescence "turn on" of the sensing system is due to aggregation-induced emission (AIE) phenomenon formed by hydrogen bonds and π conjugation promoting the specific recognition of CTC by D-CDs. The linear detection varied from 0.98 to 143.67 ng mL-1 with a low limit of detection (LOD) of 1.29 ng mL-1 (R2 = 0.998), which was lower than most reported in the literature. The D-CDs sensor was applied to detect CTC in spiked milk, blocked normal human serum, and fish samples with recoveries of 95.5-104.2% and relative standard deviations (RSDs) of 2.6%. Particularly, D-CDs based test papers with a smartphone were prepared for portable and visual detection of CTC by analyzing the various color changes of RGB of fluorescence color, with an LOD of 7.18 ng mL-1 (R2 = 0.9909). The fluorescence sensor designed in this work could be used as a rapid tool with high performance and selectivity for monitoring control in foods.
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Affiliation(s)
- Chunyan Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Gengli Huang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Xueli Luo
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Wenzhi Tang
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Tianli Yue
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Zhonghong Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
- Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling) Ministry of Agriculture, Yangling, 712100, Shaanxi, China.
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8
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Stepanidenko EA, Ushakova EV, Fedorov AV, Rogach AL. Applications of Carbon Dots in Optoelectronics. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:364. [PMID: 33535584 PMCID: PMC7912755 DOI: 10.3390/nano11020364] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 01/30/2023]
Abstract
Carbon dots (CDs) are an attractive class of nanomaterials due to the ease of their synthesis, biocompatibility, and superior optical properties. The electronic structure of CDs and hence their optical transitions can be controlled and tuned over a wide spectral range via the choice of precursors, adjustment of the synthetic conditions, and post-synthetic treatment. We summarize recent progress in the synthesis of CDs emitting in different colors in terms of morphology and optical properties of the resulting nanoparticles, with a focus on the synthetic approaches allowing to shift their emission to longer wavelengths. We further consider formation of CD-based composite materials, and review approaches used to prevent aggregation and self-quenching of their emission. We then provide examples of applications of CDs in optoelectronic devices, such as solar cells and light-emitting diodes (LEDs) with a focus on white LEDs.
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Affiliation(s)
- Evgeniia A. Stepanidenko
- Center of Information Optical Technology, ITMO University, 197101 Saint Petersburg, Russia; (E.A.S.); (E.V.U.); (A.V.F.)
| | - Elena V. Ushakova
- Center of Information Optical Technology, ITMO University, 197101 Saint Petersburg, Russia; (E.A.S.); (E.V.U.); (A.V.F.)
- Centre for Functional Photonics (CFP), Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Anatoly V. Fedorov
- Center of Information Optical Technology, ITMO University, 197101 Saint Petersburg, Russia; (E.A.S.); (E.V.U.); (A.V.F.)
| | - Andrey L. Rogach
- Centre for Functional Photonics (CFP), Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China
- Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China
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Xu A, Wang G, Li Y, Dong H, Yang S, He P, Ding G. Carbon-Based Quantum Dots with Solid-State Photoluminescent: Mechanism, Implementation, and Application. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2004621. [PMID: 33145929 DOI: 10.1002/smll.202004621] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/18/2020] [Indexed: 05/24/2023]
Abstract
Carbon-based quantum dots (CQDs), including spherical carbon dots and graphene quantum dots, are an emerging class of photoluminescent (PL) materials with unique properties. Great progress has been made in the design and fabrication of high-performance CQDs, however, the challenge of developing solid-state PL CQDs have aroused great interest among researchers. A clear PL mechanism is the basis for the development of high-performance solid-state CQDs for light emission and is also a prerequisite for the realization of multiple practical applications. However, the extremely complex structure of a CQD greatly limits the understanding of the solid-state PL mechanism of CQDs. So far, a variety of models have been proposed to explain the PL of solid-state CQDs, but they have not been unified. This review summarizes the current understanding of the solid-state PL of solid-state CQDs from the perspective of energy band theory and electronic transitions. In addition, the common strategies for realizing solid-state PL in CQDs are also summarized. Furthermore, the applications of CQDs in the fields of light-emitting devices, anti-counterfeiting, fingerprint detection, etc., are proposed. Finally, a brief outlook is given, highlighting current problems, and directions for development of solid-state PL of CQDs.
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Affiliation(s)
- Anli Xu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Gang Wang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, 315211, P. R. China
| | - Yongqiang Li
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Hui Dong
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Siwei Yang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Peng He
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Guqiao Ding
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, CAS Center for Excellence in Superconducting Electronics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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