Article
Chemistry, Analytical
Kaixin Liu, Mingfei Pan, ZiWen Zhang, Liping Hong, Xiaoqian Xie, Jingying Yang, Shan Wang, Zhijuan Wang, Yang Song, Shuo Wang
Summary: This study manufactured a ZrO2/nitrogen-doped three-dimensional porous carbon (ZrO2/N-3DPC) nanocomposite as an effective electrochemical sensor for detecting ultra-trace mercury ion. The sensor showed good adsorption and catalytic performance for Hg2+ with a wider linear range and lower detection limit. It also exhibited satisfactory repeatability and stability in detecting Hg2+ in seafood and tap water, highlighting the importance of ZrO2/N-3DPC nanocomposite in analysis and detection for food and environmental safety.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Inorganic & Nuclear
Chengxiang Chu, Chengyue Zou, Yue Qiu, Danqun Huo, Yuanyi Deng, Xianfeng Wang, Guoren Xu, Changjun Hou
Summary: The rapid and sensitive detection of heavy metal ions is crucial for food safety and the environment. Carbon quantum dots-based probes, M-CQDs, and P-CQDs, were developed for the detection of Hg2+ using fluorescence resonance energy transfer and photoinduced electron transfer mechanisms. The M-CQDs exhibited fluorescence quenching, while the P-CQDs showed fluorescence enhancement upon the addition of Hg2+. Paper-based chips modified with M/P-CQDs were successfully used for visual Hg2+ sensing, enabling real-time detection in tap water and river water samples.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Xinwen Huang, Anhua Jiang, Xiaoqiang Jin, Hangdi Yu, Yirong Zhang, Shasha Xia, Zongjian Liu, Geshan Zhang, Dionysios D. Dionysiou
Summary: Nitrogen-doped hollow carbon nanospheres were fabricated and their electrochemical properties for triclosan detection were investigated. The nanospheres exhibited excellent electrocatalytic activity, high sensitivity, and a wide linear response range for triclosan detection.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Ayse Merve Senol, Solomon Bezabeh Kassa, Yavuz Onganer
Summary: A new type of dual-doped fluorescent graphene quantum dots, P, N-GQDs, were synthesized and used as a turn off-on fluorescent sensor to detect mercury ions and cysteine. The fluorescence of P, N-GQDs was quenched in the presence of Hg2+ ions, and selectively recovered upon the addition of cysteine. Therefore, P, N-GQDs can be applied as a specific and sensitive turn off-on fluorescence sensor for detecting mercury ions and cysteine.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Multidisciplinary
Catia Correia, Jose Martinho, Ermelinda Macoas
Summary: Carbon dots doped with Eu3+ ions were synthesized and their interaction and luminescence properties were characterized by vibrational spectroscopy and UV-vis excitation spectroscopy. The Eu3+ ions are strongly coordinated with the carboxylate groups at the surface of the Cdots and incorporated within the nanographene network in the carbon core. The luminescence of the Cdots is strongly quenched by Hg2+ and Ag+, and a ratiometric sensor can be built using their luminescence intensities ratio.
Article
Engineering, Electrical & Electronic
Nancy Sidana, Prachi Rajput, Pooja Devi, Harminder Kaur
Summary: A highly sensitive and selective colorimetric sensor assay for detecting Hg2+ ions is presented in this study. This approach utilizes an anti-aggregation sensing method with AuNPs and an amine-based sensor (S) to achieve color variation from red to blue, indicating the presence of Hg2+ ions.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Applied
Jingjing Chen, Peipei Li, Yixiu Han, Yuchen Li, Yingxiang Du
Summary: Highly photoluminescent N-doped carbon quantum dots (N-CDs) with a quantum yield of 63% were prepared through hydrothermal treatment. The obtained N-CDs exhibited uniform particle size distribution, superior stability in high-salt conditions, and excellent sensitivity. A green fluorescence probe based on N-CDs was successfully utilized for ultrasensitive determination of myricetin in vine tea, showing great potential for myricetin screening.
Article
Chemistry, Analytical
Pramod Kumar Mehta, Hyojin Park, Eun-Taex Oh, Heon Joo Park, Keun-Hyeung Lee
Summary: In this study, a reversible fluorescent sensor was synthesized for the turn-on monitoring of Hg2+ in water, and a fluorescent sensing method was developed for the selective detection of CH3Hg+ over Hg2+. The sensor showed rapid response (<30 s), high sensitivity and/or selectivity, low detection limits (107 nM), and significant enhancement of fluorescence for CH3Hg+.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Sonaimuthu Mohandoss, Hari Datta Khanal, Subramanian Palanisamy, SangGuan You, Jae-Jin Shim, Yong Rok Lee
Summary: A new photoluminescent probe based on multiple heteroatom co-doped carbon dots has been synthesized for ratiometric detection of Hg2+ ions. The probe exhibits good aqueous solubility, stability, and high quantum yield, and shows high selectivity and sensitivity towards Hg2+ ions.
ANALYTICAL METHODS
(2022)
Article
Spectroscopy
Kunfeng Liu, Chongshu Xia, Yahui Guo, Hang Yu, Yunfei Xie, Weirong Yao
Summary: Surface modification of N, S-CDs was performed using cysteine and polyethylenimine as raw materials. The prepared N, S-CDs exhibited excitation-independent in the range of 300-380 nm. A fluorescence sensor with high sensitivity and selectivity to detect Hg2+ was developed based on the quenching effect of Hg2+ on the fluorescence intensity of N, S-CDs.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Environmental Sciences
Sonaimuthu Mohandoss, Naushad Ahmad, Mohammad Rizwan Khan, Kuppu Sakthi Velu, Subramanian Palanisamy, SangGuan You, Alagarasan Jagadeesh Kumar, Yong Rok Lee
Summary: In this study, photoluminescent nitrogen and sulfur co-doped carbon dots (NS-CDs) were synthesized from nitazoxanide and 3-mercaptopropionic acid via a one-pot hydrothermal method. The NS-CDs showed bright blue photoluminescence, excellent optical properties, good water solubility, and a high quantum yield. They were able to selectively detect Ag+/Hg2+ ions and achieve precise and quantitative detection of these ions in living cells. The system demonstrated high sensitivity and good recoveries when applied to real samples.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Salma Khan, Anudeep Kumar Narula
Summary: Graphene quantum dots and doped graphene quantum dots were synthesized by a one-step method and characterized using microscopy and spectroscopy. The study found that nitrogen-doped graphene quantum dots emitted blue light, while sulfur-doped graphene quantum dots emitted yellow-green light.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
A. Tony Elizabeth, E. James, L. Infant Jesan, S. Denis Arockiaraj, Antonisamy Edwin Vasu
Summary: Green synthesis of nitrogen-doped carbon quantum dots (N-CQDs) was achieved for the first time using Crescentia cujete fruit waste. The resulting N-CQDs are spherical in shape and exhibit high dispersibility in water, emitting green fluorescent light under UV irradiation. The fluorescence of N-CQDs is significantly quenched by Fe3+ ions, indicating strong electron transfer. The highly stable N-CQDs were successfully used as fluorescent probes for the sensitive detection of Fe3+ ions in three different water sources.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Nan Li, Yueyu Tong, Hao Li, Liqun Wang, Feng Hou, Shi Xue Dou, Ji Liang
Summary: Boron-doped carbon nanosphere serves as a metal-free electrocatalyst that can activate N=N triple-bonds, suppress the HER, and achieve high NH3 yield rate and high Faradaic efficiency simultaneously.
Article
Biochemistry & Molecular Biology
Xiangchuan Zhao, Liping Zhang, Zhaoyun Chu, Qing Wang, Yue Cao, Jun Cao, Jiao Li, Wu Lei, Boming Zhang, Weimeng Si
Summary: By directly pyrolyzing melamine-formaldehyde resin spheres, well-distributed Fe-decorated nitrogen-doped carbon nanospheres (Fe-NC) were prepared for electrochemical monitoring of acetaminophen. The Fe-NC showed enhanced catalysis towards the redox of acetaminophen due to abundant active sites and high-speed charge transfer. The effect of loading Fe species on the electrochemical sensing of acetaminophen was investigated in detail. The nitrogen doping and above-mentioned properties were used synergistically in the fabrication of electrochemical sensors, which exhibited a linear detection range from 0-100 μM with a detection limit of 0.026 μM, as well as satisfactory repeatability, stability, and selectivity.