Article
Chemistry, Multidisciplinary
Kai Zhu, Xinqin Cai, Yuhui Luo, Botao Liu, Qingyu Zhang, Tongtong Hu, Zunzheng Liu, Haiying Wu, Dongen Zhang
Summary: A flower-like CePO4 material with a hierarchical structure was prepared by hydrothermal method. It shows high selectivity in the detection of dopamine, uric acid, and acetaminophen. The different electrostatic and hydrogen bonding interactions between the material and the detected substances enable accurate identification. It also exhibits wide linear ranges, low detection limits, and high stability, making it suitable for real sample detection.
NEW JOURNAL OF CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Xiaofeng Zhu, Yongzhen Li, Pei Cao, Peng Li, Xinzhu Xing, Yue Yu, Ruihua Guo, Hui Yang
Summary: Graphene quantum dots (GQDs) have attracted increasing interest in chemiresistive gas sensors due to their unique physical and chemical properties. While several review articles have covered the various sensing principles and applications of GQDs, there is currently no single review article focusing on their application in chemiresistive gas sensing. Therefore, this review presents the progress and challenges of GQD-based composites in chemiresistive gas sensors, including the synthesis strategies, gas sensing enhancement mechanisms, and resulting sensing characteristics. The discussion also highlights the future prospects for the rational design of advanced GQDs-based gas-sensing materials and innovative gas sensors with novel functionalities.
Article
Materials Science, Multidisciplinary
Youfu Lu, Nan Shi, Mingming Wang, Xinyang Wang, Liyang Yin, Qiang Xu, Pinhui Zhao
Summary: This study successfully prepared GQDs/SBS composite modifier and investigated its effects on asphalt modification. The results showed that GQDs could be evenly dispersed into the SBS phase, enhancing the polarity and improving the high-temperature performance of asphalt.
Article
Chemistry, Multidisciplinary
Dheeraj Kumar, Sweety Rani, Bhanu Nandan, Rajiv K. Srivastava
Summary: Graphene quantum dots (GQDs) are a promising carbon nanomaterial with exceptional physiochemical properties. A microwave-assisted pyrolytic process is developed to synthesize GQDs with controlled size and without polar functionalities using Styrofoam waste as the precursor. The GQDs are highly soluble in nonpolar solvents and can be used as a coating on cotton fabric to provide durable hydrophobicity and excellent self-cleaning property. The use of nonbiodegradable polymer waste to generate GQDs not only addresses the issues of waste disposal, but also enables the production of high value-added products.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Analytical
Kaory Barrientos, Juan Pablo Arango, Manuel Santiago Moncada, Jersson Placido, Juliana Patino, Sara Legny Macias, Camilo Maldonado, Sandra Torijano, Sandra Bustamante, Martha Elena Londono, Marisol Jaramillo
Summary: Due to their exceptional properties, carbon dots, carbon quantum dots, and graphene quantum dots have garnered attention in biosensing. This review provides an overview of the synthesis methods, properties, and applications of these carbonaceous nanomaterials in the detection of infectious and non-communicable diseases.
Article
Chemistry, Multidisciplinary
Chun-Yan Shih, Wei-Lun Huang, I-Ting Chiang, Wu-Chou Su, Hsisheng Teng
Summary: Nitrogen-doped graphene oxide dots (NGODs) can serve as an efficient photosensitizer for Photodynamic therapy (PDT) by producing H2O2 under white-light irradiation in the presence of ascorbic acid (AA). The unique structure of NGODs restricts the transfer of photogenerated electrons for H2O2 production, showing high potential for effective and accurate deployment in PDT.
Article
Chemistry, Physical
Alfredo Ayala-Fonseca, Gonzalo Ramirez-Garcia, Josue D. Mota-Morales, Andres De Luna Bugallo, Elder De la Rosa, Pedro Salas
Summary: This work presents a straightforward methodology for obtaining Nitrogen-doped Graphene Quantum Dots (N-GQDs) with aggregation-induced emission (AIE) using salting-out purification processes. It was found that various salts, including NaCl, effectively stratify graphene-based materials (GBMs) by salting-out treatments. The method promotes the self-assembly of N-GQDs into stable J-aggregates-like arrays with good fluorescence properties and absolute quantum yield. The scalability of the process, along with the absence of additional purification steps, makes these results of great scientific and technological interest. The modulable fluorescence, size, and stability of these GBMs suggest their potential application in energy cells, sensors, and biomedical imaging.
Article
Chemistry, Analytical
Parisa Gouran Oorimi, Aliakbar Tarlani, Reza Zadmard, Jacques Muzart
Summary: This report presents a simple and highly sensitive photoluminescence sensor for detecting fatal cyanide ions using a novel composite material made from graphene quantum dots (GQDs) encapsulated in zeolitic imidazolate framework (ZIF-11). The sensor demonstrated excellent detection capabilities with a wide linear range, low relative standard deviation, and a very low limit of detection. It also showed good sensitivity towards cyanide ions in the presence of other interfering ions. Real cyanide samples from apple seeds and bitter almonds were successfully detected using this sensor. The reliable and valuable performance of this sensor makes it a promising candidate for cyanide ion detection.
MICROCHEMICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Sania Rashid, Saima Perveen, Saiqa Hafeez, Samsaam Uddin Asad, Muhammad Zarrar Khan, Fahad Azad
Summary: The GQDs/Co0.5Zn0.5Fe2O4 nanocomposite was synthesized using a sonication-assisted approach, and its properties were characterized using various techniques. The synthesized samples confirmed the formation of GQDs and Co-Zn ferrite without impurity peaks. The inclusion of GQDs in the nanocomposite led to enhanced dielectric constant at low frequencies, and the nanocomposite also exhibited superparamagnetic properties, making it a potential contrast agent in MRI applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Yanpeng Zhang, Junjie Qi, Mengying Li, Dong Gao, Chengfen Xing
Summary: Graphene quantum dots (GQDs) are used as a sensitive probe to detect formaldehyde in aqueous solutions through static quenching, showing good selectivity and sensitivity. They display a linear relationship between formaldehyde concentration and fluorescence intensity, with a detection limit of 0.0515 μg/mL. Additionally, GQDs have potential applications in food inspection for monitoring formaldehyde concentrations.
Article
Spectroscopy
Rongkun Zhu, Mushen Lai, Mingfang Zhu, Huanru Liang, Qing Zhou, Rui Li, Wenhao Zhang, Hongqing Ye
Summary: A functional ratio fluorescence sensor based on molecularly imprinted polymer coated double quantum dots has been developed for the sensitive, selective, and visual detection of sinapic acid. The sensor shows a linear response range, low detection limit, ability to distinguish molecules with similar structure, as well as fast response time and long-lasting fluorescence intensity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Nanoscience & Nanotechnology
Mehran Ghasemlou, Edwin L. H. Mayes, Billy J. Murdoch, Phuc H. Le, Chaitali Dekiwadia, Arturo Aburto-Medina, Fugen Daver, Elena P. Ivanova, Benu Adhikari
Summary: Graphene oxide quantum dots (GOQDs) are a type of high-performance carbonaceous nanomaterials with tunable photoluminescence, thermal and chemical stability, and biocompatibility. This study developed a facile strategy to engineer the interface of GOQDs through covalent doping with silicon. The doping of Si atoms into the graphitic framework of GOQDs led to tailored PL emissions and the use of Si-GOQDs on the surface of plastic films showed enhanced performance in water permeability reduction. Surface engineering of GOQDs was found to be important for improving the dispersibility and performance of nanocomposite films.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Sat Septian Dwitya, Yi-Huang Hsueh, Steven S. -S. Wang, Kuen-Song Lin
Summary: This research investigated the synthesis and antibacterial activity of GQDs and N-doped GQDs. The GQDs were prepared by pyrolysis method and considered as a green approach for QD synthesis. N-doped GQDs were synthesized via hydrothermal method with different ratios of urea. The results showed that N-doped GQDs exhibited a lower minimum inhibitory concentration, with N2 and N3 showing the strongest antibacterial effects.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Tutku Beduk, Jose Ilton de Oliveira Filho, Abdellatif Ait Lahcen, Veerappan Mani, Khaled N. Salama
Summary: Activation of LSGE electrodes significantly enhances the active area and analytical performance. Further enhancement in the electrochemical response of electrodes is achieved through the electrodeposition of metal nanoparticles.
Article
Engineering, Chemical
Shuhan Cai, Jingzi Beiyuan, Liyun Huang, Xiaocong Cao, Maojun Deng, Daofei Lv, Xin Chen, Defei Liu, Dongmei Luo, Wenbing Yuan
Summary: In this study, nitrogen-doped graphene quantum dots (N-GQDs) with irregular structure defects and abundant reactive functional groups were successfully prepared using a mechanochemical method. It was found that the N-GQDs can rapidly generate multiple reactive oxygen species (ROS) in the presence of acid without oxygen in dark. The N-GQDs also exhibited efficient catalytic activity in the hydrothermal synthesis of a metal-organic framework.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Analytical
Gang Qu, Yuxin Zhao, Qiaoli Zhang, Jina Wu, Xiaosen Li, Yang Yang, Shilei Liu
Summary: In this study, magnetic mesoporous materials combined with real-time in situ mass spectrometry were used for the high-throughput detection of hydrolyzed products of organophosphorus nerve agents. The method showed good linearity, low limits of detection and quantification, and high extraction recoveries. The magnetic preparation method used was quick, cost-effective, rugged, and safe. The results demonstrated the potential of this method for rapid and efficient determination of the target analytes in environmental samples.
ANALYTICAL METHODS
(2024)
Article
Chemistry, Analytical
Anna Hildebrand, Mariam Merchant, Danny O'Hare
Summary: Substandard and falsified artemisinin derivatives in antimalarials have caused significant deaths and economic losses. This study evaluates the feasibility of voltammetric methods for identifying and quantifying artemether. The findings suggest that electrochemical analysis shows promise as a method for artemether identification and quantification.
ANALYTICAL METHODS
(2024)
Article
Chemistry, Analytical
Marx Osorio Araujo Pereira, Alvaro Ferreira Junior, Edson Silvio Batista Rodrigues, Helena Mulser, Giovanna Nascimento de Mello e Silva, Wallans Torres Pio dos Santos, Eric de Souza Gil
Summary: Brazilian spotted fever (BSF) is a serious and rapidly evolving disease. A new impedimetric immunosensor was developed for rapid diagnosis by measuring specific antibodies in plasma. The sensor demonstrated selectivity and accuracy, and has potential for important applications in diagnostic testing.
ANALYTICAL METHODS
(2024)
Article
Chemistry, Analytical
Kathrin Schilling, Ronald A. Glabonjat, Olgica Balac, Marta Galvez-Fernandez, Arce Domingo-Relloso, Vesna Slavkovich, Jeff Goldsmith, Miranda R. Jones, Tiffany R. Sanchez, Ana Navas-Acien
Summary: Analysis of trace elements in urine is an important tool for assessing exposures, diagnosing nutritional status, and guiding public health and healthcare intervention. This study provides a sensitive method for analyzing 18 elements in urine samples, using only 100 μL. The results show good accuracy and sensitivity of the method.
ANALYTICAL METHODS
(2024)
Article
Chemistry, Analytical
Mengya Li, Shijie Liu, Shiliang Guo, Dong Liang, Miaoyun Li, Yaodi Zhu, Lijun Zhao, Jong-Hoon Lee, Gaiming Zhao, Yangyang Ma, Yanxia Liu
Summary: In this study, a magnetic flow device was developed to purify spores in a culture medium system. The device used magnetic nanoparticles to absorb vegetative cells, separating them from the spores. The achieved purity of the collected spores was over 95%. The study also demonstrated a rapid quantitative detection method using Raman spectroscopy.
ANALYTICAL METHODS
(2024)
Article
Chemistry, Analytical
Wanqiong Liu, Zixuan Wu, Jianwei Peng, Zebin Xu, Yong Liang
Summary: Metal-organic frameworks (MOFs) are effective carriers for molecular imprinting, but their poor dispersibility in aqueous solution is a significant drawback. In this study, we have applied amphiphilic block copolymers and molecularly imprinted technology on MOFs to improve the hydrophilicity of molecularly imprinted fluorescent materials.
ANALYTICAL METHODS
(2024)