Article
Chemistry, Physical
Shahriar N. Khan, Braden M. Weight, Brendan J. Gifford, Sergei Tretiak, Alan Bishop
Summary: The optoelectronic properties of functionalized graphene quantum dots were studied by simulating different shapes and types of functionalization. The results showed that the functionalization position and edge shape played important roles in the optical properties. The isomers with CH2 in the intermediate positions showed higher electronic transition energies and exciton delocalization. Complete passivation of rhombic GQDs resulted in the largest structural deformation and strongest red-shift. The substituents F, CH3, Cl, and Br caused a steady red-shift in the absorption energy, suggesting the dominance of steric effects.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Analytical
Zehui Jin, Meng Liu, Xiaodan Huang, Xuemeng Zhang, Zexing Qu, Jun-Jie Zhu, Qianhao Min
Summary: This study presents a versatile top-down strategy for rational engineering of carbon material-based matrices to assist in the detection and imaging of small biomolecules using MALDI mass spectrometry imaging. Nitrogen-doped graphene quantum dots were found to have superior capability in assisting the detection of various small molecules, and the proposed negative-ion NGQDs-assisted LDI MSI achieved the imaging of low-MW lipids in rat brain tissue. This work offers a new route for customizing nanomaterial matrices and has important applications in biomedical and pathological research.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
I Jennifer Gomez, Manuel Vazquez Sulleiro, Anna Doleckova, Nadezda Pizurova, Jirina Medalova, Antonin Bednarik, Jan Preisler, David Necas, Lenka Zajickova
Summary: GQDs synthesized using a fast microwave-assisted hydrothermal protocol exhibited emission from NUV-Vis to NIR range, with their structure and chemical composition elucidated using advanced NMR and spectroscopy techniques. The observed multicolor red-shifted fluorescence emission in cell imaging demonstrates the potential application of GQDs as bioimaging carriers, along with their non-cytotoxicity confirmed through ATP assay.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Yexiong Huang, Xianping Chen, Jiabing Yu, Lu-Qi Tao
Summary: This work introduces a graphene-based film heater using LRGO fabricated by laser direct writing technology, which shows high heating rate and fast response time due to the high photothermal effect of CO2 laser. It also demonstrates good anti-interference ability to mechanical effects and has potential important applications for de-icing.
Article
Nanoscience & Nanotechnology
Kapil Bhorkar, Nikolaos Samartzis, Michail Athanasiou, Labrini Sygellou, Nikos Boukos, Vassilios Dracopoulos, Theophilos Ioannides, Spyros N. Yannopoulos
Summary: This study demonstrates a simple and scalable process to prepare high-purity turbostratic graphene and graphene/SiOx nanohybrids using laser-mediated explosive synthesis and transfer of graphene flakes. The process is capable of producing graphene flakes on various substrates and shows potential applications in flexible electronics.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Minqiang Wang, Yiran Yang, Wei Gao
Summary: Laser-engraved graphene (LEG) has shown great promise in flexible electronics, with its versatile properties and environmental friendliness. Its technological advances enable LEG to be applied in a wide range of wearable and flexible electronic devices.
TRENDS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
I. Jennifer Gomez, Manuel Vazquez Sulleiro, Anna Doleckova, Nadezda Pizurova, Jirina Medalova, Rajarshi Roy, David Necas, Lenka Zajickova
Summary: Graphene quantum dots with tunable fluorescence emission, especially N-doped GQDs, were successfully synthesized from glucose and ethylenediamine using a microwave-assisted hydrothermal method. The N-GQDs exhibited fluorescence in the visible spectral region, extending to near-UV and slightly near-IR. The study also revealed the influence of band-to-band transitions, size effect, and nitrogen/oxygen functional groups on the multicolor emission of N-GQDs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Albina Mikhraliieva, Michael Nazarkovsky, Ricardo Queiroz Aucelio, Yutao Xing, Volodymyr Zaitsev
Summary: Nitrogen-doped carbon nanodots (CNDs) with a high quantum yield of photoluminescence (up to 95%) were synthesized by thermal treatment of citric acid embedded in silica with immobilized N-[3-(Trimethoxysilyl)propyl]ethylenediamine. The use of nanoreactors allowed for the spatial isolation of molecular precursors, resulting in the preparation of high-quality spherical nanoparticles with a size of 2-5 nm. The obtained CNDs exhibited excitation-independent photoluminescence at 453 nm, indicating their potential as efficient photoluminescent materials. The presence of ordered crystalline structures in the CNDs, as revealed by HRTEM, suggests the catalytic effect of the nanoreactor. XPS analysis confirmed the nitrogen doping in the CNDs, with 4.0 at. % of nitrogen atoms incorporated into the graphene core as pyrrolic and ternary fragments.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Energy & Fuels
Suresh Pavithra, Vinoth Kumar Jothi, Arulmozhi Rajaram, Sagar Ingavale, Abirami Natarajan
Summary: A bimetallic metal-organic framework (MOF) codoped with carbon nanodots (CNDs) was synthesized via solvothermal treatment. The composite material exhibited efficient oxygen evolution reaction (OER) electrocatalytic activity.
Article
Chemistry, Multidisciplinary
Yong Yang, Ming Li, Chao Zhou, Kexin Zhou, Jian Yu, Yanjie Su, Nantao Hu, Yafei Zhang
Summary: The study demonstrates the design and construction of sulfur-doped graphene skeletons decorated with metal oxide nanoparticles as highly efficient antibacterial agents. These hybrids exhibit exceptional activity inhibition of Escherichia coli and Staphylococcus aureus, showing great potential for clinical application in antibacterial agents with high efficiency.
Article
Engineering, Electrical & Electronic
Yong Fang, Zhiwei Zhao, Mengru Zhu, Zhengjin Weng, Chao Fang, Xi Jia
Summary: This article proposes a hybrid photodetector based on CNDs and graphene for solar-blind UV detection, demonstrating high photoresponsivity and detectivity. The integration of graphene and CNDs shows improved optical absorption and wavelength selectivity for practical applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Xiaoya Zhang, Huan Wang, Weijia An, Hongxia Guo, Li Liu, Wenquan Cui
Summary: In this study, a highly efficient photocatalyst for the conversion of CO2 into useful chemical fuels was developed by combining Cu nanodots with oxygen vacancies-rich bismuth molybdate. The composite catalyst exhibited excellent photocatalytic reduction activity, with significantly improved visible light absorption and enhanced separation of photogenerated charge carriers.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
Meng Gao, Xia Dong, Kedian Wang, Wenqiang Duan, Xiaomao Sun, Chenguang Zhu, Wenjun Wang
Summary: A one-step picosecond laser direct-writing method is proposed to synthesize graphene/MnO nanocomposites and process interdigital electrodes for microsupercapacitors, achieving a high specific capacitance of 470 mF cm(-2). The symmetric microsupercapacitors based on graphene/MnO interdigital electrodes exhibit excellent electrochemical performance, with a maximum energy density of 4.89 mu MTh cm(-2) and a maximum power density of 0.72 mW cm(-2). This approach also offers a way to synthesize other graphene/metal oxide nanocomposites for microsupercapacitors.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Multidisciplinary
G. Theodoros Chatzimitakos, Claire Pliatsika, Ieremias Chousidis, D. Ioannis Leonardos, Constantine D. Stalikas
Summary: The study examined the impact of carbon nanodots (CNDs) on zebrafish using a metabolomic approach. Different types of CNDs induced changes in metabolic pathways, highlighting potential effects on marine organisms.
Article
Engineering, Marine
Kyung Woo Kim, Dawoon Chung, Seung-Hyun Jung, Yong Min Kwon, Jawoon Young Hwan Kim, Kyunghwa Baek
Summary: This paper reports the synthesis of CNDs-ZnO nanocomposite with antibacterial and antifungal properties using S. horneri, a marine brown alga considered useless in Korea. The results show that the nanocomposite is highly effective against both Gram-positive and Gram-negative bacteria, as well as yeast and mold. It also exhibits low toxicity compared to chlorine bleach. This work highlights the potential utility of unappreciated marine species in antimicrobial applications.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
