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Krishnakumar R, James A, Swathi RS. Metal‐Decorated Crown Ether‐Embedded Graphene Nanomeshes for Enhanced Molecular Adsorption. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rohini Krishnakumar
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM) Vithura Thiruvananthapuram 695551 India
| | - Anto James
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM) Vithura Thiruvananthapuram 695551 India
| | - Rotti Srinivasamurthy Swathi
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram (IISER TVM) Vithura Thiruvananthapuram 695551 India
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2
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Azizi-Lalabadi M, Jafari SM. Bio-nanocomposites of graphene with biopolymers; fabrication, properties, and applications. Adv Colloid Interface Sci 2021; 292:102416. [PMID: 33872984 DOI: 10.1016/j.cis.2021.102416] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 01/21/2023]
Abstract
The unique properties of graphene and graphene oxide (GO) nanocomposites make them suitable for a wide range of medical, industrial, and agricultural applications. The addition of graphene or GO to a polymeric matrix can ameliorate its thermo-mechanical, electrical, and barrier characteristics. The present paper reviews the literature on graphene/GO-based bio-nanocomposites and examines the various fabrication methods, such as chemical vapor deposition, chemical synthesis, microwave synthesis, the solvothermal method, molecular beam epitaxy, and colloidal suspension. Each procedure potentially has its disadvantages, especially for mass production. Therefore, introducing an effective method for fabricating graphene on a large scale with high quality is essential. Recent studies have shown that graphene-based bio-nanocomposites are promising materials given their excellent performance in the development of biosensors, drug delivery systems, antimicrobials, modified electrodes, and energy storage systems among other applications. In this review, we evaluate the various procedures used for developing graphene/GO-based bio-nanocomposites and examine the features and applications of the related products. Furthermore, the toxicity of these compounds and attempts to uncover the optimal combinations of biopolymers and carbon nanomaterials for industrial applications will be discussed.
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Kumar Choutipalli VS, Subramanian V. Role of Graphitic Nitrogen and π‐Conjugated Functional Groups in Selective Oxidation of Alcohols: A DFT based Mechanistic Elucidation. Chem Asian J 2019; 14:4798-4806. [DOI: 10.1002/asia.201901062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 09/27/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Venkata Surya Kumar Choutipalli
- Inorganic and Physical Chemistry LaboratoryCSIR-Central Leather Research Institute Adyar Chennai 600 020 India
- Academy of Scientific and Innovative Research (AcSIR) Gaziabad India
| | - Venkatesan Subramanian
- Inorganic and Physical Chemistry LaboratoryCSIR-Central Leather Research Institute Adyar Chennai 600 020 India
- Academy of Scientific and Innovative Research (AcSIR) Gaziabad India
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Soleymaniha M, Shahbazi MA, Rafieerad AR, Maleki A, Amiri A. Promoting Role of MXene Nanosheets in Biomedical Sciences: Therapeutic and Biosensing Innovations. Adv Healthc Mater 2019; 8:e1801137. [PMID: 30362268 DOI: 10.1002/adhm.201801137] [Citation(s) in RCA: 153] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Indexed: 01/04/2023]
Abstract
MXene nanosheets have emerged as biocompatible transition metal structures, which illustrate desirable performance for various applications due to their unique structural, physicochemical, and compositional features. MXenes are currently expanding their usage territory from mechanical, optical, chemical, and electronic fields toward biomedical areas. This is mainly originated from their large surface area and strong absorbance in near-infrared region, which in combination with their facile surface functionalization with various polymers or nanoparticles, make them promising nanoplatforms for drug delivery, cancer therapy, precise biosensing and bioimaging. The facile surface modification of the MXenes can mediate the better in vivo performance of them through reduced toxicity, enhanced colloidal stability, and extended circulation within the body. Herein, the synthesis and state-of-the-art progresses of MXene nanosheets designed for biomedical applications, including structural- and dose-dependent antimicrobial activity, photothermal therapy, drug delivery, and implants are emphasized. Furthermore, biosensing applications are highlighted and a comprehensive discussion on photoacoustic imaging, magnetic resonance imaging, computed tomography imaging, and optical imaging of MXenes is presented. The challenges and future opportunities of applying MXene nanomaterials in the area of biomedicine are also discussed.
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Affiliation(s)
| | - Mohammad-Ali Shahbazi
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads DK-2800 Kgs, Lyngby Denmark
- Department of Pharmaceutical Nanotechnology; School of Pharmacy; Zanjan University of Medical Sciences; 45139-56184 Zanjan Iran
- Drug Research Program; Division of Pharmaceutical Chemistry and Technology; Faculty of Pharmacy; University of Helsinki; Helsinki FI-00014 Finland
| | - Ali Reza Rafieerad
- St. Boniface Hospital Research Centre; Department of Physiology; University of Manitoba; Winnipeg Canada
| | - Aziz Maleki
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads DK-2800 Kgs, Lyngby Denmark
- Zanjan Pharmaceutical Nanotechnology Research Center (ZPNRC); Zanjan University of Medical Sciences; 45139-56184 Zanjan Iran
| | - Ahmad Amiri
- Department of Mechanical Engineering; Texas A&M University; College Station TX 77483 USA
- Department of Pharmaceutical Nanotechnology; School of Pharmacy; Zanjan University of Medical Sciences; 45139-56184 Zanjan Iran
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Ma C, Liao Q, Sun H, Lei S, Zheng Y, Yin R, Zhao A, Li Q, Wang B. Tuning the Doping Types in Graphene Sheets by N Monoelement. NANO LETTERS 2018; 18:386-394. [PMID: 29266951 DOI: 10.1021/acs.nanolett.7b04249] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The doping types of graphene sheets are generally tuned by different dopants with either three or five valence electrons. As a five-valence-electrons element, however, nitrogen dopants in graphene sheets have several substitutional geometries. So far, their distinct effects on electronic properties predicted by theoretical calculations have not been well identified. Here, we demonstrate that the doping types of graphene can be tuned by N monoelement under proper growth conditions using chemical vapor deposition (CVD), characterized by combining scanning tunneling microscopy/spectroscopy, X-ray/ultraviolet photoelectron spectroscopy, Hall effect measurement, Raman spectroscopy, and density functional theory calculations. We find that a relatively low partial pressure of CH4 (mixing with NH3) can lead to the growth of dominant pyridinic N substitutions in graphene, in contrast with the growth of dominant graphitic N substitutions under a higher partial pressure of CH4. Our results unambiguously confirm that the pyridinic N leads to the p-type doping, and the graphitic N leads to the n-type doping. Interestingly, we also find that the pyridinic N and the graphitic N are preferentially separated in different domains. Our findings shed light on continuously tuning the doping level of graphene monolayers by using N monoelement, which can be very convenient for growth of functional structures in graphene sheets.
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Affiliation(s)
- Chuanxu Ma
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Qing Liao
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
- College of Chemical and Biological Engineering, Hezhou University , Hezhou, Guangxi 542899, People's Republic of China
| | - Haifeng Sun
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Shulai Lei
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Yi Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Ruoting Yin
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Aidi Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Qunxiang Li
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
| | - Bing Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China
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Herath D, Dinadayalane T. Computational investigation of double nitrogen doping on graphene. J Mol Model 2017; 24:26. [PMID: 29273911 DOI: 10.1007/s00894-017-3560-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 12/01/2017] [Indexed: 11/27/2022]
Abstract
Density functional theory (DFT) calculations were performed to study doping of two nitrogen atoms at different positions on a finite-sized graphene model of C82H24. We examined 21 structures of double nitrogen doped graphene to calculate their relative stabilities. The structure with two nitrogen atoms located apart is the most stable among the positional isomers considered in this study. For double nitrogen doping within a six-membered ring, the 1,4-position is more preferred than 1,3- or 1,2-positions for the finite-sized single layer graphene sheet. Our computational study supports the experimental observation of two nitrogen atoms at the 1,3- and 1,4-positions in a single six-membered ring of graphene. Furthermore, the structures with N-N bond are the least stable among two nitrogen doped graphene structures. The effects of nitrogen doping and the positions of two nitrogen atoms on the HOMO-LUMO energy gap of pristine graphene were analyzed.
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Affiliation(s)
- Dinushka Herath
- Department of Chemistry, Clark Atlanta University, 223 James P. Brawley Drive, S.W, Atlanta, GA, 30314, USA
| | - Tandabany Dinadayalane
- Department of Chemistry, Clark Atlanta University, 223 James P. Brawley Drive, S.W, Atlanta, GA, 30314, USA.
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