Article
Chemistry, Multidisciplinary
Aumber Abbas, Qijie Liang, Saleem Abbas, Maryam Liaqat, Shabnum Rubab, Tanveer A. Tabish
Summary: This article presents an eco-friendly and acid-free method for preparing graphene quantum dots (GQDs) using a low-cost and renewable carbon source. The results demonstrate the characteristics of the prepared GQDs and their application in detecting ferric ions.
Article
Materials Science, Multidisciplinary
Feng Xie, Zhiduo Liu, Changxing Wang, Da Chen, Wei Zhu, Xiamen Li, Qinglei Guo, Gang Wang
Summary: This study successfully obtained nitrogen-doped graphene monolayers by seeding nitrogen-doped graphene quantum dots (N-GQDs) on a catalytic substrate, and fabricated high-performance infrared photodetectors.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Biochemical Research Methods
Yuan Zhao, Ying Zhang, Huilin Liu, Baoguo Sun
Summary: A chiroptical system based on chiral assembly graphene quantum dots was developed for visual testing of D-phenylalanine, and successfully applied to intracellular chiroptical imaging.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Lena Golubewa, Tatsiana Kulahava, Aliona Klimovich, Danielis Rutkauskas, Ieva Matulaitiene, Renata Karpicz, Nikita Belko, Dmitri Mogilevtsev, Alena Kavalenka, Marina Fetisova, Petri Karvinen, Yuri Svirko, Polina Kuzhir
Summary: In this study, it is demonstrated that green fluorescence graphene quantum dots can detect the presence of hypochlorous acid and selectively detect reactive chlorine species produced by neutrophils. Changes in the fluorescence of GQDs under different conditions make them a promising sensing agent for biomedical applications.
Article
Chemistry, Multidisciplinary
Bingyang Li, Xiao Xiao, Menglei Hu, Yanxin Wang, Yiheng Wang, Xianhang Yan, Zhenzhen Huang, Peyman Servati, Linjun Huang, Jianguo Tang
Summary: In recent years, the fluorescence and quantum yield of graphene quantum dots have been significantly improved through doping atoms, which shows promising applications in fluorescence sensors and biological imaging. In this study, manganese ions bonded with boron and nitrogen-doped graphene quantum dots (Mn-BN-GQDs) were synthesized using a one-step hydrothermal synthesis method. Compared with boron and nitrogen co-doping graphene quantum dots (BN-GQDs), Mn-BN-GQDs exhibit improved fluorescence properties and quantum yield. Moreover, Mn-BN-GQDs show low toxicity, good fluorescence imaging in living cells, and high selectivity to Fe3+ ions. Therefore, Mn-BN-GQDs are designed as fluorescence sensors to detect Fe3+ ions, providing strong evidence for their advanced high sensitivity, selectivity, and wide detection range.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Chemical
Tong Yu, Xin Wang, Zhiyu Liu, Zhongyan Chen, Zhuan Hong, Mingen Zhang, Quanxing Zheng, Wenyao Shao, Quanling Xie
Summary: By introducing amino acid-functionalized graphene quantum dots, the desalination performance and self-cleaning performance of nanofiltration membranes can be improved without sacrificing water flux and salt rejection. AA-fGQDs with polar amino acids and low bandgap energies demonstrate better performance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Xiucai Sun, Xiaoting Liu, Zhongti Sun, Xintong Zhang, Yuzhu Wu, Yeshu Zhu, Yuqing Song, Kaicheng Jia, Jincan Zhang, Luzhao Sun, Wan-Jian Yin, Zhongfan Liu
Summary: This study reveals the importance of vapor catalysis in superclean graphene growth through density functional theory calculations, an ideal gas model, and a designed experiment. The study finds that the vapor mainly consists of Cui clusters, which have a significant impact on graphene growth. DFT calculations show that Cu clusters exhibit strong capabilities for adsorption, dehydrogenation, and decomposition, providing a sufficient supply of active carbon atoms for rapid graphene growth. Experimental validation confirms that increasing the amount of Cu vapor improves the growth rate and surface cleanliness of graphene.
Review
Chemistry, Analytical
Ajaypal Kaur, Komal Pandey, Ramandeep Kaur, Nisha Vashishat, Manpreet Kaur
Summary: This review article discusses the synthesis and application of carbon-based quantum dots and their nanocomposites as sensors. Different synthesis methods are categorized as top-down and bottom-up approaches, with a comparison of their advantages and disadvantages. The environmental applications of CQDs/GQDs nanocomposites and pristine quantum dots as sensors are presented in detail, along with recent advances and future prospects.
Article
Chemistry, Analytical
Xueying Zhu, Jiayu Yu, Yongcun Yan, Weiling Song, Xin Hai
Summary: This work presents a one-pot alkali cutting-assisted synthesis approach to fabricate fluorescence tunable NH2-GQDs, which exhibit concentration- and excitation-dependent fluorescence behaviors, suitable for pH sensing and construction of a tannic acid fluorescence quenching sensing platform.
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
Materials Science, Multidisciplinary
Xinbing Jiang, Huan Yang, Yuxi Fei, Jiuhong Wang, Shujiang Ding
Summary: This study investigates the thermal-sensitive photoluminescence properties of mercaptosuccinic acid-capped cadmium telluride quantum dots. It is found that the peak wavelength of the quantum dots' photoluminescence redshifts and the fluorescence lifetime shortens with increasing temperature. In situ XRD patterns show that the increase in temperature leads to thermal expansion and an increase in grain size, resulting in the redshift of the luminescence peak wavelength position. The results demonstrate that mercaptosuccinic acid-capped cadmium telluride quantum dots are excellent candidates for luminescence thermometry over a wide temperature range from -100 to 60 degrees C.
Review
Chemistry, Multidisciplinary
Xinzhe Xiao, Yumin Zhang, Lei Zhou, Bin Li, Lin Gu
Summary: Graphene oxide (GO) is an excellent photoluminescence (PL) material with unique optical properties. It has been widely used in various fields such as material science and biomedicine. The luminescence mechanism of GO and GOQDs is still not fully understood, but they show potential in medical imaging and biosensors.
Review
Chemistry, Multidisciplinary
Wenqian Yao, Hongtao Liu, Jianzhe Sun, Bin Wu, Yunqi Liu
Summary: This review provides a comprehensive overview of current challenges and opportunities for chemical vapor deposition (CVD) growth, characterization, and electrical properties of graphene depending on the layer number and twist angles. Various state-of-the-art innovations using the CVD method are presented, and the underlying growth mechanisms and characterization methods are discussed.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mikiko Vazquez-Nakagawa, Laura Rodriguez-Perez, Nazario Martin, M. Angeles Herranz
Summary: This study describes a method for preparing new chiral graphene quantum dots through chemical functionalization, and examines their supramolecular assembly using microscopy. Fluorescence studies show that the fibers stem from the pi-pi stacking of pyrenes and GQDs, along with the hydrogen bonding interactions of the amide groups.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Chamseddine Bouhafs, Sergio Pezzini, Fabian R. Geisenhof, Neeraj Mishra, Vaidotas Miseikis, Yuran Niu, Claudia Struzzi, R. Thomas Weitz, Alexei A. Zakharov, Stiven Forti, Camilla Coletti
Summary: The study successfully synthesized rhombohedral graphene with a thickness of up to 9 layers, with alternating crystal domains identified in Raman spectroscopy. Microscopic and spectroscopic analyses suggest that rhombohedral-stacking formation is correlated to underlying copper step-bunching.
Article
Chemistry, Multidisciplinary
Jayanta S. Boruah, Kamatchi Sankaranarayanan, Devasish Chowdhury
Summary: Understanding the interaction between carbon quantum dots and cell membranes is crucial for designing effective nanoparticle-based drug delivery systems. This study investigated the interaction between phosphatidylcholine vesicles (as model cell membrane) and carbon quantum dots with different functional groups. The results showed that carbon dots with -NH2 functional groups exhibited strong binding with the vesicles. These findings provide insights for biomedical researchers to design efficient carbon-based nanomaterials as drug/gene delivery vehicles.
Article
Chemistry, Analytical
Ankita Deb, Gaurav Raghunath Nalkar, Devasish Chowdhury
Summary: The dynamic interplay between nanotechnology and immunoassay has led to the development of a novel immunosensor using carbon dots for the detection of the disease biomarker VEGF. Carbon dots synthesized from a biogenic source were conjugated with a detection antibody and used as fluorescent labels. The immunosensor showed a wide linear range and low detection limit, demonstrating the potential of carbon dots as fluorescent labels in immunoassay techniques.
ANALYTICA CHIMICA ACTA
(2023)
Article
Engineering, Electrical & Electronic
Eswari Elango, Veera Prabu Kannan, Sridharan Madangurusamy, Rakesh Kumar Karn, Devasish Chowdhury, Chandan Upadhyay, Asha Yadav
Summary: Silver (Ag) thin films of various thickness were prepared using DC magnetron sputtering for surface plasmonic resonance (SPR). Ag nanoparticles were formed by annealing Ag thin films at a high temperature. The effect of deposition time on the optical and structural properties of the Ag nanoparticles were investigated, and tunable Ag nanoparticles with variation in the deposition time will be used for surface plasmon resonance in two-dimensional (2D) material for terahertz photodetector applications.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Review
Geochemistry & Geophysics
Jayanta S. Boruah, Devasish Chowdhury
Summary: Clay materials are often modified due to their weak mechanical strength and low reactivity, resulting in better performance than pure clay. This review focuses on clay hybrids in the form of nanocomposites with carbon nanomaterials, such as graphene oxide and carbon nanotubes. These efficient clay composites have various applications including catalysis, wastewater treatment, cargo delivery, optoelectronics, and filtration. The evidence shows that these clay nanocomposites with carbon nanomaterials exhibit significantly improved mechanical strength, loading capacity, surface area, and functionality compared to pure clay.
Article
Environmental Sciences
Paramita Chakravarty, Hemen Deka, Devasish Chowdhury
Summary: The potential of anthracene biodegradation was studied using green synthesized TiO2 nanoparticles (NPs) and Alcaligenes faecalis HP8 in liquid culture and soil microcosm environment. The TiO2 nanoparticles were synthesized using Paenibacillus sp. HD1PAH and Cyperus brevifolius. The dual application of TiO2 nanoparticles and Alcaligenes faecalis HP8 reduced the concentration of anthracene by 21.3% in liquid culture after 7 days and by 37.9% in soil treatments after 30 days. The study discovered a novel anthracene degradation pathway and demonstrated increased activities of soil enzymes after the combined treatments.
Review
Biochemistry & Molecular Biology
Ankita Deb, Devasish Chowdhury
Summary: Carbon dots (CDs), a new class of nanomaterials, have unique characteristics such as good aqueous solubility, colloidal stability, resistance to photobleaching, and fluorescence tunability, making them useful in various applications. This review focuses on the use of biogenic materials for the synthesis of biogenic carbon dots (BCDs) in the past five years, discussing different synthetic protocols and significant findings. The review also examines the applications of BCDs in chemo and biosensors, drug delivery, bioimaging, catalysis, and energy applications. Biogenic carbon dots are future sustainable materials replacing traditional carbon quantum dots from other sources.
CURRENT MEDICINAL CHEMISTRY
(2023)
Review
Plant Sciences
Zesmin Khan, Thorny Chanu Thounaojam, Devasish Chowdhury, Hrishikesh Upadhyaya
Summary: Selenium is an essential micronutrient that promotes plant growth and development and protects plants against abiotic stresses. Understanding the absorption, translocation, and accumulation of selenium in plants is crucial for its inclusive benefits. This review discusses the role of selenium in plant metabolism, including its uptake, translocation, signaling, and physiological responses to abiotic stress. Additionally, the synthesis and impact of nanostructured selenium materials on plants are highlighted.
PLANT GROWTH REGULATION
(2023)
Article
Biotechnology & Applied Microbiology
Kabyashree Phukan, Himangshu Sarma, Rajlakshmi Devi, Devasish Chowdhury
Summary: The acute oral toxicity of onion peel-derived gold nano-bioconjugate (GNBC) was investigated in this study. The findings showed that GNBC had no mortality or abnormal complications in female mice during the 15-day study period. The LD50 was determined to be higher than 2000 mg/kg, and hematological and biochemical analyses demonstrated no significant toxicity in treated animals compared to the control group. The results indicate that GNBC can be safely used for therapeutic applications in vivo.
Article
Chemistry, Multidisciplinary
Jahnabi Gogoi, Tridib K. Sarma, Devasish Chowdhury
Summary: This study investigates the applicability of carbon dots derived from glucose in solubilizing insoluble phosphates, and measures the concentration of phosphates in the soil. The results demonstrate that carbon dots can effectively solubilize insoluble phosphates, which is insightful for the application of nanomaterials in agriculture.
Article
Biochemistry & Molecular Biology
Robinson C. Jose, Thangjam Kanchal, Bengyella Louis, Narayan C. Talukdar, Devasish Chowdhury
Summary: This research conducted microscopic and proteomic analyses to investigate the factors involved in false smut formation caused by Ustilaginoidea virens in rice. Significant differences in peptide bands and spots were detected between infected and non-infected grains, and the identified proteins in resistant grains were involved in various biological processes. The study also found that U. virens produces degrading enzymes and other proteins during smut formation. The dimension of rice grain spikes, their elemental composition, moisture content, and specific peptides produced by the grains and the fungi were found to play a vital role in false smut formation.
Article
Nanoscience & Nanotechnology
Nur Jalal Mondal, Rahul Sonkar, Samir Thakur, Nirab Ch. Adhikary, Devasish Chowdhury
Summary: This study investigates the catalytic activities of AuNR-MoS2 QDs composite and AuNS-MoS2 QDs composite, as well as AuNR and AuNS. The results show that the AuNR-MoS2 QDs composite exhibits the highest catalytic efficiency, with a rate constant of 0.06 min-1, compared to the AuNS-MoS2 QDs composite, AuNR, and AuNS, with rate constants of 0.023, 0.021, and 0.008 min-1 respectively.
ACS APPLIED NANO MATERIALS
(2023)
Review
Engineering, Environmental
Tuhin Bhattacharjee, Achyut Konwar, Jayanta Sarmah Boruah, Devasish Chowdhury, Gitanjali Majumdar
Summary: Cost-effective methods for removal of water pollutants are urgently needed due to the release of toxic materials into water bodies. Heavy metal pollution poses a major health risk and is associated with various diseases. Adsorption-based methods using carbon dots as green adsorbents have shown great potential for removing heavy metals from water. The use of bio sources as a green precursor for carbon dot synthesis offers opportunities for fabricating inexpensive materials for heavy metal remediation. Carbon dot composites with various materials have been discussed for their enhanced efficiency in heavy metal removal.
JOURNAL OF HAZARDOUS MATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Jahnabi Gogoi, Devasish Chowdhury
Summary: This study focuses on the development of efficient photocatalysts based on zinc titanate (ZnTiO3) for the degradation of tetracycline, an emerging contaminant. The synthesized ZnTiO3 samples were characterized using various techniques such as UV-Vis spectroscopy, FTIR spectroscopy, XRD, SEM, and Raman spectrometry. The results showed that ZnTiO3 calcinated at 600 degrees C, carbon dot-doped ZnTiO3 calcinated at 600 degrees C, and the ZnTiO3-nanocellulose composite exhibited the highest photocatalytic activity with degradation rates of 98.27%, 99.14%, and 99.81% respectively. The study also identified the active species involved in the degradation process of tetracycline hydrochloride under light illumination, including holes and superoxide ions. These findings contribute to the development of strategies for mitigating emerging contaminants.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Rahul Sonkar, Nur Jalal Mondal, Samir Thakur, Eeshankur Saikia, Mritunjoy Prasad Ghosh, Devasish Chowdhury
Summary: A detailed experimental and theoretical investigation has been conducted to understand the microstructural, magnetic, optical, and dielectric properties of Co-doped ZnS QDs prepared via chemical co-precipitation techniques. The results show that Co-doped ZnS QDs exhibit weak ferromagnetic behavior, blue shift in the absorption spectra due to quantum confinement effect, and good photocatalytic performance, indicating their potential as dilute magnetic semiconductors.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Characterization & Testing
Lutfor Rahman, Jutika Goswami, Devasish Choudhury
Summary: In this study, chitosan was blended with Tectona grandis leaf extract and stem extract to prepare biocomposites, and their physicochemical properties were investigated. The incorporation of plant extracts improved the mechanical and UV barrier properties of the composites. Among them, Ch-L5 and Ch-L10 films exhibited high efficiency in removing chromium (VI). These eco-friendly prepared films are cost-effective and can be used as suitable materials for food packaging.
POLYMERS & POLYMER COMPOSITES
(2022)
