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Wu C, Zhu J, Zhang B, Shi H, Zhang H, Yuan S, Yin Y, Chen G, Chen C. Efficient pH-universal aqueous supercapacitors enabled by an azure C-decorated N-doped graphene aerogel. J Colloid Interface Sci 2023; 650:1871-1880. [PMID: 37517187 DOI: 10.1016/j.jcis.2023.07.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 07/15/2023] [Accepted: 07/23/2023] [Indexed: 08/01/2023]
Abstract
Current aqueous supercapacitors (SCs) possess the relative low energy density, and there is therefore widespread interest in cost-effective fabrication of capacitive materials with promoted specific capacitance and/or broadened voltage window. Here, a redox-active azure C-decorated N-doped graphene aerogel (AC - NGA) is fabricated using a simple hydrothermal self-assembly method through strong noncovalent π-π interaction. AC - NGA highlights an excellent charge storage performance (a high 591F g-1 gravimetric capacitance under a current density of 1.0 A g-1 and ultrahigh voltage window of 2.3 V) under pH-universal conditions. The capacitive contribution of charge storage is 91.7%, exceeding or comparable to those of the best pseudocapacitors known. Furthermore, a symmetric AC - NGA//AC - NGA device realizes high energy and power densities (15.2-60.2 Wh kg-1 at 650-23,000 W kg-1) and excellent cycling stability in acidic, neutral, and basic aqueous solutions. This work offers a cost-effective strategy to combine redox dye molecules with heteroatom-doped graphene aerogel for building green efficient pH-universal aqueous supercapacitors.
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Affiliation(s)
- Chenghan Wu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Jiawan Zhu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Buyuan Zhang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Hucheng Shi
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Hui Zhang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Saisai Yuan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Yu Yin
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Guangchun Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China
| | - Chuanxiang Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, 666 Changhui Road, Zhenjiang 212100, Jiangsu, PR China.
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2
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A novel conductive nanocomposite-based biosensor for ultrasensitive detection of microRNA-21 in serum, using methylene blue as mediator. Bioelectrochemistry 2022; 148:108256. [PMID: 36081272 DOI: 10.1016/j.bioelechem.2022.108256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/05/2022] [Accepted: 08/29/2022] [Indexed: 01/01/2023]
Abstract
MicroRNA-21 (miRNA-21) is a common biomarker with high expression in breast tumors. Therefore, sensitive detection of miRNA-21 is of great significance for clinical breast tumor diagnosis. A TH/rGO/CMK-3/AuNPs nanocomposite is composed of thionine (TH), reduced graphene oxide (rGO), ordered mesoporous carbon (CMK-3), and gold nanoparticles (AuNPs), which help to increase the specific surface area of a glassy carbon electrode (GCE) and to amplify the DPV signal. Meanwhile, methylene blue (MB) was combined with the capture probe guanine and absorbed by the composite material to mediate the differential pulse voltammetry (DPV) of the obtained miRNA biosensor. The current response decreased with increasing miRNA-21 concentration under optimal conditions. The biosensor responds to miRNA-21 in the 0.1fM-1 pM concentration range, and the detection limit (LOD) was 0.046 fM. Moreover, human serum samples were effectively detected utilizing the miRNA-21 biosensor with satisfactory results.
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3
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Lewandowska-Andralojc A, Gacka E, Pedzinski T, Burdzinski G, Lindner A, O'Brien JM, Senge MO, Siklitskaya A, Kubas A, Marciniak B, Walkowiak-Kulikowska J. Understanding structure-properties relationships of porphyrin linked to graphene oxide through π-π-stacking or covalent amide bonds. Sci Rep 2022; 12:13420. [PMID: 35927398 PMCID: PMC9352710 DOI: 10.1038/s41598-022-16931-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 07/18/2022] [Indexed: 11/09/2022] Open
Abstract
Two graphene oxide nanoassemblies using 5-(4-(aminophenyl)-10,15,20-triphenylporphyrin (TPPNH2) were fabricated by two synthetic methods: covalent (GO-CONHTPP) and noncovalent bonding. GO-CONHTPP was achieved through amide formation at the periphery of GO sheets and the hybrid material was fully characterized by FTIR, XPS, Raman spectroscopy, and SEM. Spectroscopic measurements together with theoretical calculations demonstrated that assembling TPPNH2 on the GO surface in DMF-H2O (1:2, v/v) via non-covalent interactions causes changes in the absorption spectra of porphyrin, as well as efficient quenching of its emission. Interestingly, covalent binding to GO does not affect notably neither the porphyrin absorption nor its fluorescence. Theoretical calculations indicates that close proximity and π-π-stacking of the porphyrin molecule with the GO sheet is possible only for the non-covalent functionalization. Femtosecond pump-probe experiments revealed that only the non-covalent assembly of TPPNH2 and GO enhances the efficiency of the photoinduced electron transfer from porphyrin to GO. In contrast to the non-covalent hybrid, the covalent GO-CONHTPP material can generate singlet oxygen with quantum yields efficiency (ΦΔ = 0.20) comparable to that of free TPPNH2 (ΦΔ = 0.26), indicating the possible use of covalent hybrid materials in photodynamic/photothermal therapy. The spectroscopic studies combined with detailed quantum-chemical analysis provide invaluable information that can guide the fabrication of hybrid materials with desired properties for specific applications.
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Affiliation(s)
- Anna Lewandowska-Andralojc
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland. .,Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland.
| | - Ewelina Gacka
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland.,Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland
| | - Tomasz Pedzinski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland.,Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland
| | - Gotard Burdzinski
- Faculty of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61-614, Poznan, Poland
| | - Aleksandra Lindner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Jessica M O'Brien
- School of Chemistry, Chair of Organic Chemistry, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin 2, Ireland
| | - Mathias O Senge
- School of Chemistry, Chair of Organic Chemistry, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin 2, Ireland.,Institute for Advanced Study (TUM-IAS), Focus Group-Molecular and Interfacial Engineering of Organic Nanosystems, Technical University of Munich, 85748, Garching, Germany
| | - Aleksandra Siklitskaya
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Adam Kubas
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Bronislaw Marciniak
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614, Poznan, Poland.,Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznanskiego 10, 61-614, Poznan, Poland
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4
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Guo Q, Sun H, Chen JL, Zhang J. A graphene oxide-based covalent resorufin-conjugated fluorescence "off-on" probe for detection of hydrazine. Chem Asian J 2022; 17:e202200060. [PMID: 35415962 DOI: 10.1002/asia.202200060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 04/07/2022] [Indexed: 11/11/2022]
Abstract
The unique properties of graphene oxide (GO), such as good water solubility, non-toxicity, biocompatibility and cell permeability, make GO well suited for a number of biological applications. In this study, we explore the application of GO as an efficient fluorescent quencher for a highly fluorescent organic dye, resorufin (RF). The quenching effect of GO on resorufin is studied by noncovalent and covalent bonding of resorufin, respectively. The fluorescence is completely quenched when resorufin is covalently linked to GO; while resorufin's fluorescence could be still observed through noncovalent bonding to GO sheet. Interestingly, addition of hydrazine into RF-GO complex causes the fluorescence recovered, providing a potential ''OFF-ON'' fluorescence responsive probe for detecting hydrazine in vitro and in living cells.
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Affiliation(s)
- Qiang Guo
- Hong Kong Metropolitan University, Department of Science, HONG KONG
| | - Hongyan Sun
- City University of Hong Kong, Department of Biology and Chemistry, Tat Chee Avenue, NA, Hong Kong, CHINA
| | - Jian Lin Chen
- Hong Kong Metropolitan University, Department of Science, HONG KONG
| | - Jie Zhang
- City University of Hong Kong, Chemistry, HONG KONG
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5
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Azizi S, Gholivand MB, Amiri M, Manouchehri I, Moradian R. Carbon dots-thionine modified aptamer-based biosensor for highly sensitive cocaine detection. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116062] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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6
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Tao D, Xie C, Fu S, Rong S, Song S, Ye H, Jaffrezic-Renault N, Guo Z. Thionine-functionalized three-dimensional carbon nanomaterial-based aptasensor for analysis of Aβ oligomers in serum. Anal Chim Acta 2021; 1183:338990. [PMID: 34627525 DOI: 10.1016/j.aca.2021.338990] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/14/2021] [Accepted: 08/23/2021] [Indexed: 01/07/2023]
Abstract
How to sensitively detect early biomarkers of Alzheimer's disease (AD) is nowadays, one of the major challenges. In this work, Aβ oligomers (AβO), one of the AD biomarkers, was analyzed using an electrochemical aptasensor, which was prepared based on thionine (Th) - functionalized three - dimensional carbon nanomaterials (reduced graphene oxide (rGO) and multi-wall carbon nanotubes (MWCNTs)) immobilized DNA-aptamer. Th, a positively charged planar aromatic molecule, form many π - π conjugated structures with rGO and MWCNTs, then improving the structural stability, electron transfer and the capacitive properties of Th-rGO-MWCNTs nanocomposites. Under the optimal conditions, differential pulse voltammetry (DPV) current responses decreased with the increase of AβO concentration. The obtained AβO aptasensor presented a wide linear range of 0.0443 pM-443.00 pM and limit of detection (LOD) was 10 fM. Meanwhile, AβO aptasensor displayed remarkable stability and selectivity. It has a great potential for early diagnosis of AD in human real serum samples.
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Affiliation(s)
- Dan Tao
- Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, 430065, PR China; Resources and Environmental Engineering College, Wuhan University of Science and Technology, Wuhan, 430081, PR China
| | - Chang Xie
- School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Sinan Fu
- School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Shuang Rong
- Department of Nutrition and Food Hygiene, Academy of Nutrition and Health, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Shizhen Song
- Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, 430065, PR China; Resources and Environmental Engineering College, Wuhan University of Science and Technology, Wuhan, 430081, PR China; School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, 430065, PR China
| | - Huarong Ye
- China Resources & Wisco General Hospital, Wuhan, 430080, PR China.
| | - Nicole Jaffrezic-Renault
- University of Lyon, Institute of Analytical Sciences, UMR-CNRS 5280, 5 La Doua Street, Villeurbanne, 69100, France.
| | - Zhenzhong Guo
- Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, 430065, PR China.
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7
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Peng M, Yang W, Li L, Zhang K, Wang L, Hu T, Yuan K, Chen Y. Fast assembly of MXene hydrogels by interfacial electrostatic interaction for supercapacitors. Chem Commun (Camb) 2021; 57:10731-10734. [PMID: 34585203 DOI: 10.1039/d1cc04574a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and fast method for preparing MXene hydrogels is proposed by introducing protonated thionine molecules into a MXene dispersion through electrostatic interaction. Such a 3D hydrogel effectively suppressed restacking and oxidation, and enlarged the surface utilization of the MXene, producing an improved specific capacitance of 163 F g-1 at 1 A g-1 and excellent stability when used as an electrode material for supercapacitors.
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Affiliation(s)
- Mengke Peng
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Weizu Yang
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Longbin Li
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Kaiyang Zhang
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Li Wang
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Ting Hu
- School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China
| | - Kai Yuan
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China.
| | - Yiwang Chen
- Institute of Polymers and Energy Chemistry (IPEC), College of Chemistry, Nanchang University, Nanchang 330031, China. .,Institute of Advanced Scientific Research (IASR), Key Laboratory of Functional Small Molecule Ministry of Education, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, China
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8
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Martínez-Periñán E, García-Mendiola T, Enebral-Romero E, Del Caño R, Vera-Hidalgo M, Vázquez Sulleiro M, Navío C, Pariente F, Pérez EM, Lorenzo E. A MoS 2 platform and thionine-carbon nanodots for sensitive and selective detection of pathogens. Biosens Bioelectron 2021; 189:113375. [PMID: 34087724 DOI: 10.1016/j.bios.2021.113375] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/16/2021] [Accepted: 05/17/2021] [Indexed: 12/20/2022]
Abstract
This work focuses on the combination of molybdenum disulfide (MoS2) and à la carte functionalized carbon nanodots (CNDs) for the development of DNA biosensors for selective and sensitive detection of pathogens. MoS2 flakes prepared through liquid-phase exfoliation, serves as platform for thiolated DNA probe immobilization, while thionine functionalized carbon nanodots (Thi-CNDs) are used as electrochemical indicator of the hybridization event. Spectroscopic and electrochemical studies confirmed the interaction of Thi-CNDs with DNA. As an illustration of the pathogen biosensor functioning, DNA sequences from InIA gen of Listeria monocytogenes bacteria and open reading frame sequence (ORF1ab) of SARS-CoV-2 virus were detected and quantified with a detection limit of 67.0 fM and 1.01 pM, respectively. Given the paradigmatic selectivity of the DNA hybridization, this approach allows pathogen detection in the presence of other pathogens, demonstrated by the detection of Listeria monocytogenes in presence of Escherichia coli. We note that this design is in principle amenable to any pathogen for which the DNA has been sequenced, including other viruses and bacteria. As example of the application of the method in real samples it has been used to directly detect Listeria monocytogenes in cultures without any DNA Polymerase Chain Reaction (PCR) amplification process.
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Affiliation(s)
| | - Tania García-Mendiola
- Departamento de Química Analítica. Universidad Autónoma de Madrid, 28049, Madrid, Spain; Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
| | | | - Rafael Del Caño
- Departamento de Química Analítica. Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | | | | | - Cristina Navío
- IMDEA-Nanociencia, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Félix Pariente
- Departamento de Química Analítica. Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Emilio M Pérez
- IMDEA-Nanociencia, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Encarnación Lorenzo
- Departamento de Química Analítica. Universidad Autónoma de Madrid, 28049, Madrid, Spain; Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain; IMDEA-Nanociencia, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
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9
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Premkumar S, Nataraj D, Bharathi G, Ramya S, Thangadurai TD. Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent. Sci Rep 2019; 9:18704. [PMID: 31822730 PMCID: PMC6904578 DOI: 10.1038/s41598-019-55097-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 11/19/2019] [Indexed: 11/11/2022] Open
Abstract
Detection of visible blind UV radiation is not only interesting but also of technologically important. Herein, we demonstrate the efficient detection of UV radiation by using cluster like ZnS quantum dot solid nanostructures prepared by simple reflux condensation technique. The short-chain ligand 3-mercaptopropionic acid (MPA) involved in the synthesis lead to the cluster like formation of ZnS quantum dots into solids upon prolonged synthesis conditions. The ZnS QD solid formation resulted in the strong delocalization of electronic wave function between the neighboring quantum dots. It increases the photocurrent value, which can be further confirmed by the decrease in the average lifetime values from 64 to 4.6 ns upon ZnS cluster like QD solid formation from ZnS QDs. The ZnS quantum dot solid based UV sensor shows good photocurrent response and a maximum responsivity of 0.31 (A/W) at a wavelength of 390 nm, is not only competitive when compared with previous reports but also better than ZnS and metal oxide-based photodetectors. The device exhibits a high current value under low-intensity UV light source and an on/off ratio of IUV/Idark = 413 at zero biasing voltage with a fast response. Further, photocurrent device has been constructed using ZnS quantum dot solid nanostructures with graphene hybrids as an active layer to improve the enhancement of photoresponsivity.
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Affiliation(s)
- Sellan Premkumar
- Quantum Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India.
- School of Chemistry and Chemical Engineering, Tianjin Polytechnic University, Tianjin, 300387, China.
- Tianjin Key Laboratory of Green Chemistry and Process Engineering, and School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, China.
| | - Devaraj Nataraj
- Quantum Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India.
- UGC-CPEPA Centre for Advanced Studies in Physics for the development of Solar Energy Materials and Devices, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India.
| | - Ganapathi Bharathi
- Quantum Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India
| | - Subramaniam Ramya
- Quantum Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India
| | - T Daniel Thangadurai
- Department of Nanoscience and Technology, Sri Ramakrishna Engineering College, Coimbatore, Tamil Nadu, 641022, India
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10
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Ren S, Meng L, Ma W, Lin S, Yang W, Lan J, Jia X, Cai Q, Yang X. Enhancing overall properties of epoxy-based composites using polydopamine-coated edge-carboxylated graphene prepared via one-step high-pressure ball milling. Phys Chem Chem Phys 2019; 21:21726-21737. [PMID: 31372612 DOI: 10.1039/c9cp03014j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Graphene (GN) nanofillers have been widely used to enhance the overall performance of polymer composites due to their various superior properties, which strongly rely on the uniform dispersion and strong interfacial bonding of GN with high-quality polymer matrices. In the present study, the strengthening and functional effects of polydopamine-coated edge-carboxylated graphene (p-ECG) on the mechanical, moisture-barrier and electromagnetic properties of epoxy (EP)-based composites were systematically evaluated. p-ECG was successfully prepared via one-step high-pressure ball milling through the edge-selective functionalization and exfoliation of pristine graphite in the presence of dry ice, followed by synchronous reduction and coating via the mild oxidative polymerization of mussel-inspired dopamine. p-ECG showed prominent advantages of a small sheet size, excellent dispersibility and high chemical reactivity in the EP matrix. Obvious enhancements were achieved in the tensile and flexural properties and moisture-barrier performance of EP composites as well as the interlaminar shear strength (ILSS) and transverse fiber bundle tensile (TFBT) strength of carbon fiber (CF)/EP composites, which confirmed the excellent dispersion and chemically strengthened interfacial bonding of p-ECG in the EP matrix. More importantly, p-ECG introduced onto the surface of desized CF led to significant enhancement in the electromagnetic interference (EMI) shielding capability of CF/EP composites, which was primarily ascribed to the polarization relaxation effect induced by the defects and functional groups in p-ECG as well as the increase in electrical conductivity derived from the "bridging effect" of p-ECG. Specifically, with p-ECG content of 0.5 wt%, the increments in tensile strength, TFBT strength, shielding effectiveness (total, SET) and shielding effectiveness (reflection loss, SER) were as high as 33.3, 34.3, 31.3 and 71.0%, respectively.
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Affiliation(s)
- Shujie Ren
- State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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11
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Ghafary Z, Hallaj R, Salimi A, Akhtari K. A Novel Immunosensing Method Based on the Capture and Enzymatic Release of Sandwich-Type Covalently Conjugated Thionine-Gold Nanoparticles as a New Fluorescence Label Used for Ultrasensitive Detection of Hepatitis B Virus Surface Antigen. ACS OMEGA 2019; 4:15323-15336. [PMID: 31572831 PMCID: PMC6761744 DOI: 10.1021/acsomega.9b00713] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 08/22/2019] [Indexed: 05/05/2023]
Abstract
A novel ultrasensitive and simple amplified immunosensing strategy is designed based on a surface-enhanced fluorescence (SEF) nanohybrid made from covalently conjugated thionine-gold nanoparticles (GNP-Th), as a novel amplified fluorescence label, and magnetic nanoparticles (MNPs), as a biological carrier, used for hepatitis B virus surface antigen (HBsAg) detection. This immunosensing strategy operates on the basis of the capture and then release of the amplified fluorescence label. Capturing of the antiHBs-antibody (Ab)-modified GNP-thionine hybrid (GNP-Th-Ab) is carried out through the formation of a two-dimensional (sandwich) probe between this amplified label and antiHBs-antibody-modified magnetic nanoparticles (MNP-Ab), in the presence of a target antigen and using an external magnetic force. Afterward, releasing of the captured fluorescence label is performed using a protease enzyme (pepsin) by a digestion mechanism of grafted antibodies on the GNP-thionine hybrid. As a result of antibody digestion, the amplified fluorescent hybrids (labels) are released into the solution. To understand the mechanism of enhanced fluorescence, the nature of the interaction between thionine and gold nanoparticles is studied using the B3LYP density functional method. In such a methodology, several new mechanisms and structures are used simultaneously, including a SEF-based metal nanoparticle-organic dye hybrid, dual signal amplification in a two-dimensional probe between the GNP-thionine hybrid and MNPs, and a novel releasing method using protease enzymes. These factors improve the sensitivity and speed, along with the simplicity of the procedure. Under optimal conditions, the fluorescence signal increases with the increment of HBs antigen concentration in the linear dynamic range of 4.6 × 10-9 to 0.012 ng/mL with a detection limit (LOD) of 4.6 × 10-9 ng/mL. The proposed immunosensor has great potential in developing ultrasensitive and rapid diagnostic platforms.
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Affiliation(s)
- Zhaleh Ghafary
- Department of Chemistry, Nanotechnology Research Center, and Department of
Physics, University of Kurdistan, P.O. Box 416, Sanandaj 6617715175, Iran
| | - Rahman Hallaj
- Department of Chemistry, Nanotechnology Research Center, and Department of
Physics, University of Kurdistan, P.O. Box 416, Sanandaj 6617715175, Iran
| | - Abdollah Salimi
- Department of Chemistry, Nanotechnology Research Center, and Department of
Physics, University of Kurdistan, P.O. Box 416, Sanandaj 6617715175, Iran
| | - Keivan Akhtari
- Department of Chemistry, Nanotechnology Research Center, and Department of
Physics, University of Kurdistan, P.O. Box 416, Sanandaj 6617715175, Iran
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12
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Affiliation(s)
- Teresa L. Mako
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Joan M. Racicot
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Mindy Levine
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
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