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Kitamura M, Umemura K. Hybridization of papain molecules and DNA-wrapped single-walled carbon nanotubes evaluated by atomic force microscopy in fluids. Sci Rep 2023; 13:4833. [PMID: 36964258 PMCID: PMC10039081 DOI: 10.1038/s41598-023-31927-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 03/20/2023] [Indexed: 03/26/2023] Open
Abstract
Although various conjugates of single-walled carbon nanotubes (SWNTs) and biomolecules, such as nanobiosensors and nanobiodevices, have been reported, the conjugation of papain and SWNTs have not been reported because of the formation of unexpected aggregates. In this study, atomic force microscopy (AFM) in liquid was used to investigate the interactions between papain and DNA-wrapped SWNTs (DNA-SWNTs) at two different pH values (pH 3.0 and 10.5). The direct AFM observation of the mixture of papain and DNA-SWNTs confirmed the aggregation of papain molecules with DNA-SWNTs in the buffer solutions. The numerous and non-uniform adsorption of papain molecules onto DNA-SWNTs was more pronounced at pH 3.0 than that at pH 10.5. Furthermore, thick conjugates appeared when papain and DNA-SWNTs were simultaneously mixed. The near-infrared photoluminescence spectra of the SWNTs drastically changed when the papain molecules were injected into the DNA-SWNT suspension at pH 3.0. Thus, the regulation of electrostatic interactions is a key aspect in preparing optimal conjugates of papain and DNA-SWNTs. Furthermore, although previous papers reported AFM images of dried samples, this study demonstrates the potential of AFM in liquid in evaluating individual bioconjugates of SWNTs.
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Affiliation(s)
- Masaki Kitamura
- Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, 1628601, Japan.
| | - Kazuo Umemura
- Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, 1628601, Japan
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2
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Patel V, Kruse P, Selvaganapathy PR. Solid State Sensors for Hydrogen Peroxide Detection. BIOSENSORS 2020; 11:9. [PMID: 33375685 PMCID: PMC7823577 DOI: 10.3390/bios11010009] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/15/2020] [Accepted: 12/22/2020] [Indexed: 11/16/2022]
Abstract
Hydrogen peroxide (H2O2) is a key molecule in numerous physiological, industrial, and environmental processes. H2O2 is monitored using various methods like colorimetry, luminescence, fluorescence, and electrochemical methods. Here, we aim to provide a comprehensive review of solid state sensors to monitor H2O2. The review covers three categories of sensors: chemiresistive, conductometric, and field effect transistors. A brief description of the sensing mechanisms of these sensors has been provided. All three sensor types are evaluated based on the sensing parameters like sensitivity, limit of detection, measuring range and response time. We highlight those sensors which have advanced the field by using innovative materials or sensor fabrication techniques. Finally, we discuss the limitations of current solid state sensors and the future directions for research and development in this exciting area.
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Affiliation(s)
- Vinay Patel
- School of Biomedical Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada;
| | - Peter Kruse
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada;
| | - Ponnambalam Ravi Selvaganapathy
- School of Biomedical Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada;
- Department of Mechanical Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada
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3
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Abstract
We propose a paper solar cell based on carbon nanotube (CNT)-composite papers. To fabricate this cell, we use dye-sensitized solar cells (DSCs) for generating power through the redox reaction of dyes in conjunction with CNT-composite papers, which are composite materials containing CNTs and pulp (raw paper material) that can be fabricated easily by using a method based on the Japanese washi papermaking technique. The demand for CNT applications is expected to increase due to their high conductivity and metallic or semiconducting characteristics. This CNT-composite paper can also have metallic or semiconducting characteristics based on the contained CNTs in the composite paper. We previously fabricated a DSC that generates electricity by using CNT-composite papers stacked in a typical DSC structure. However, the conversion efficiency of this DSC was just 0.188%, which is not practical. To overcome this low power generation issue, we tried improving the DSC structure by applying electrodes to the CNT-composite papers in grid patterns for efficient current collection and applying an optimally mixed dye for efficient electron excitation. Results showed that the conversion efficiency improved to 0.58%. Moreover, we demonstrated that using a mixed dye can improve the conversion efficiency of the paper DSC. We expect these types of CNT-composite papers to be used as material for new DSCs.
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Damasceno JPV, Zarbin AJG. A new approach for the achievement of stable aqueous dispersions of carbon nanotubes. Chem Commun (Camb) 2019; 55:5809-5812. [DOI: 10.1039/c9cc01541h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and innovative way to achieve highly stable aqueous dispersions of both multi- and single-walled carbon nanotubes is reported.
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Affiliation(s)
- João Paulo V. Damasceno
- Department of Chemistry
- Federal University of Paraná (UFPR)
- Centro Politécnico
- CP 19032
- Curitiba
| | - Aldo J. G. Zarbin
- Department of Chemistry
- Federal University of Paraná (UFPR)
- Centro Politécnico
- CP 19032
- Curitiba
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5
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Ishibashi Y, Ito M, Homma Y, Umemura K. Monitoring the antioxidant effects of catechin using single-walled carbon nanotubes: Comparative analysis by near-infrared absorption and near-infrared photoluminescence. Colloids Surf B Biointerfaces 2017; 161:139-146. [PMID: 29073526 DOI: 10.1016/j.colsurfb.2017.10.055] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 10/16/2017] [Accepted: 10/18/2017] [Indexed: 01/08/2023]
Abstract
We measured the optical responses of single-walled carbon nanotubes (SWNTs) after adding Japanese green tea or catechin. SWNTs were covered with DNA in aqueous solution, and tea or catechin solution was added to the DNA-SWNT suspension. The antioxidant effects of tea and catechin were detected as changes in the near-infrared (NIR) absorption (ABS) and NIR-photoluminescence (PL) spectra of the SWNTs. Commercial Japanese tea, diluted 100 times and containing 15μg/mL catechin, was sufficient for recovering NIR-ABS and NIR-PL spectra when the DNA-SWNT suspension was pre-treated with 0.03% hydrogen peroxide(H2O2). Similar results were obtained with 15μg/mL of pure catechin solution. SWNTs with specific chirality were sensitive to the NIR-ABS and NIR-PL changes. The (10, 5)/(8, 7) and (9, 4) SWNTs showed the highest recovery in NIR-ABS and NIR-PL, respectively. NIR-PL recovery was higher than that of NIR-ABS for (10, 5)/(8, 7) and (9, 4). Spectral changes could be monitored thoroughly at pH 8.0, contrary to pH 6.0 and 7.3. However, the most dynamic recovery of NIR-ABS and NIR-PL was observed at pH 6.0. Furthermore, time-lapse measurements revealed that recovery was faster with tea or catechin addition than H2O2-induced oxidation.
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Affiliation(s)
- Yu Ishibashi
- Department of Physics, Graduate School of Sciences, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 1628601, Japan
| | - Masahiro Ito
- Department of Physics, Graduate School of Sciences, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 1628601, Japan
| | - Yoshikazu Homma
- Department of Physics, Graduate School of Sciences, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 1628601, Japan
| | - Kazuo Umemura
- Department of Physics, Graduate School of Sciences, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 1628601, Japan.
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6
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Wu S, Zhang L, Weng P, Yang Z, Tang Z, Guo B. Correlating synergistic reinforcement with chain motion in elastomer/nanocarbon hybrids composites. SOFT MATTER 2016; 12:6893-6901. [PMID: 27387393 DOI: 10.1039/c6sm01116k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The strategy of using hybrid fillers with different geometric shapes and aspect ratios has been established to be an efficient way to achieve high-performance polymer composites. While, in spite of the recently renowned advances in this field, the mechanism of synergistic behavior in the system is still unclear and equivocal. In this study, we systematically investigated the mechanism for the synergistic reinforcement in an elastomer reinforced by nanocarbon hybrids consisting of 2D reduced graphene oxide (rGO) and 1D carbon nanotubes (CNTs). The improved dispersion state of hybrid filler was attested by Raman, UV-Vis spectra and morphological observations. In addition to the phenomenological evidences, we substantiated a stronger confinement effect of hybrid network on chain dynamics, for the first time, with molecular concepts by dielectric relaxation analysis. The formation of a glassy interphase with orders of magnitude slower chain dynamics than that for bulk chains has been explicitly demonstrated in the hybrid system. Besides improved dispersion upon hybridization, it is believed the formation of a glassy interphase is another crucial factor in governing the synergistic reinforcement capability of hybrid composites. We envision this new finding provides significant insight into the mechanism of synergistic behavior in hybrid-filled polymer composites with molecular concepts.
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Affiliation(s)
- Siwu Wu
- Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Liqun Zhang
- State Key Laboratory of Organic/Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Peijin Weng
- Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Zhijun Yang
- Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Zhenghai Tang
- Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
| | - Baochun Guo
- Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
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In situ green synthesis of Ag nanoparticles on tea polyphenols-modified graphene and their catalytic reduction activity of 4-nitrophenol. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.09.015] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Zhang P, Zhou T, He L, Zhang S, Sun J, Wang J, Qin C, Dai L. Dispersion of multi-walled carbon nanotubes modified by rosemary acid into poly(vinyl alcohol) and preparation of their composite fibers. RSC Adv 2015. [DOI: 10.1039/c5ra06804e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
MWCNTs were functionalized with RosA through π–π stacking and then blended with PVA to form PVA/m-MWCNT composites.
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Affiliation(s)
- Pei Zhang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Tengfei Zhou
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Liucheng He
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Shiyu Zhang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Jun Sun
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Jianjun Wang
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Chuanxiang Qin
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
| | - Lixing Dai
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- People's Republic of China
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Fujigaya T, Nakashima N. Fuel cell electrocatalyst using polybenzimidazole-modified carbon nanotubes as support materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1666-81. [PMID: 23423836 DOI: 10.1002/adma.201204461] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 11/26/2012] [Indexed: 05/11/2023]
Abstract
Toward the next generation fuel cell systems, the development of a novel electrocatalyst for the polymer electrolyte fuel cell (PEFC) is crucial to overcome the drawbacks of the present electrocatalyst. As a conductive supporting material for the catalyst, carbon nanotubes (CNTs) have emerged as a promising candidate, and many attempts have been carried out to introduce CNT, in place of carbon black. On the other hand, as a polymer electrolyte, polybenzimidazoles (PBIs) have been recognized as a powerful candidate due to the high proton conductivity above 100 °C under non-humid conditions. In 2008, we found that these two materials have a strong physical interaction and form a stable hybrid material, in which the PBIs uniformly wrap the surfaces of the CNTs. Furthermore, PBIs serve as effective binding sites for the formation of platinum (Pt) nanoparticles to fabricate a ternary composite (CNT/PBIs/Pt). In this review article, we summarize the fundamental properties of the CNT/PBIs/Pt and discuss their potential as a new electrocatalyst for the PEFC in comparison with the conventional ones. Furthermore, potential applications of CNT/PBIs including use of the materials for oxygen reduction catalysts and reinforcement of PBI films are summarized.
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Affiliation(s)
- Tsuyohiko Fujigaya
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395 Japan.
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10
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Fabrication of Aligned-Carbon-Nanotube-Composite Paper with High and Anisotropic Conductivity. JOURNAL OF NANOTECHNOLOGY 2012. [DOI: 10.1155/2012/819281] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A functional carbon-nanotube (CNT)-composite paper is described in which the CNTs are aligned. This “aligned-CNT composite paper” is a flexible composite material that has CNT functionality (e.g., electrical conductivity) despite being a paper. An advanced fabrication method was developed to overcome the problem of previous CNT-composite papers, that is, reduced conductivity due to random CNT alignment. Aligning the CNTs by using an alternating current (AC) field was hypothesized to increase the electrical conductivity and give the paper an anisotropic characteristic. Experimental results showed that a nonionic surfactant was not suitable as a CNT dispersant for fabricating aligned-CNT composite paper and that catechin with its six-membered rings and hydrophilic groups was suitable. Observation by scanning electron microscopy of samples prepared using catechin showed that the CNTs were aligned in the direction of the AC field on the paper fibers. Measurement of the electric conductivity showed that the surface resistance was different between the direction of the aligned CNTs (high conductivity) and that of verticality (low). The conductivity of the aligned-CNT-composite paper samples was higher than that of nonaligned samples. This unique and functional paper, which has high and anisotropic conductivity, is applicable to a conductive material to control the direction of current.
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11
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Wang Y, Shi Z, Yin J. Facile synthesis of soluble graphene via a green reduction of graphene oxide in tea solution and its biocomposites. ACS APPLIED MATERIALS & INTERFACES 2011; 3:1127-33. [PMID: 21438576 DOI: 10.1021/am1012613] [Citation(s) in RCA: 232] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The chemical reduction of graphene oxide (GO) typically involves highly toxic reducing agents that are harmful to human health and environment, and complicated surface modification is often needed to avoid aggregation of the reduced GO during reduction process. In this paper, a green and facile strategy is reported for the fabrication of soluble reduced GO. The proposed method is based on the reduction of exfoliated GO in green tea solution by making use of the reducing capability and the aromatic rings of tea polyphenol (TP) that contained in tea solution. The measurements of the resultant graphene confirm the efficient removal of the oxygen-containing groups in GO. The strong interactions between the reduced graphene and the aromatic TPs guarantee the good dispersion of the reduced graphene in both aqueous and a variety of organic solvents. These features endow this green approach with great potential in constructing of various graphene-based materials, especially for high-performance biorelated materials as demonstrated in this study of chitosan/graphene composites.
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Affiliation(s)
- Yan Wang
- School of Chemistry and Chemical Technology, State Key Laboratory of Metal Matrix Composite Materials, Shanghai Jiao Tong University, 200240 Shanghai, PR China
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Chen Y, Lee YD, Vedala H, Allen BL, Star A. Exploring the chemical sensitivity of a carbon nanotube/green tea composite. ACS NANO 2010; 4:6854-62. [PMID: 21043457 PMCID: PMC3026703 DOI: 10.1021/nn100988t] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Single-walled carbon nanotubes (SWNTs) possess unique electronic and physical properties, which make them very attractive for a wide range of applications. In particular, SWNTs and their composites have shown a great potential for chemical and biological sensing. Green tea, or more specifically its main antioxidant component, epigallocatechin gallate (EGCG), has been found to disperse SWNTs in water. However, the chemical sensitivity of this SWNT/green tea (SWNT/EGCG) composite remained unexplored. With EGCG present, this SWNT composite should have strong antioxidant properties and thus respond to reactive oxygen species (ROS). Here we report on fabrication and characterization of SWNT/EGCG thin films and the measurement of their relative conductance as a function of H(2)O(2) concentrations. We further investigated the sensing mechanism by Fourier transform infrared (FTIR) spectroscopy and field-effect transistor measurements (FET). We propose here that the response to H(2)O(2) arises from the oxidation of EGCG in the composite. These findings suggest that SWNT/green tea composite has a great potential for developing simple resistivity-based sensors.
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Affiliation(s)
| | | | | | | | - Alexander Star
- Department of Chemistry, University of Pittsburgh and the National Energy Technology Laboratory, Pittsburgh, PA 15260 (USA), Fax: (+1) 412-624-4027
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Yu A, Su CCL, Roes I, Fan B, Haddon RC. Gram-scale preparation of surfactant-free, carboxylic acid groups functionalized, individual single-walled carbon nanotubes in aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1221-1225. [PMID: 19916485 DOI: 10.1021/la902341w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report a simple method to prepare individual electric arc-produced single-walled carbon nanotubes (SWNTs) in aqueous solution on a large scale through three steps of processing: refluxing in concentrated HNO(3), low speed centrifugation, and high speed centrifugation. The bulk production (10 g of starting SWNTs) results in a concentration of 0.2 mg/mL individual SWNTs stably dispersed in DI-H(2)O without any external protection. The atomic force microscopy images show that the aqueous dispersion contained approximately 80% individual SWNTs with lengths ranging from 500 nm to 1 micrometer. It is found that the stable individual SWNT dispersion has an absolute zeta potential value of approximately 72 mV with a concentration of 0.05 mg/mL at pH 5. We believe that it is this high zeta potential resulting from an electrical double layer which produces the repulsion to overcome the van der Waals attraction thereby keeping the SWNTs individually dispersed. The free-standing film prepared from the individual SWNT dispersion exhibits a 4-probe electrical conductivity of approximately 2000 S/cm and a transmittance of 60% at 550 nm.
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Affiliation(s)
- Aiping Yu
- Department of Chemical Engineering; Nanotechnology Institute, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
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FUJIGAYA T, TANAKA Y, NAKASHIMA N. Soluble Carbon Nanotubes and Application to Electrochemistry. ELECTROCHEMISTRY 2010. [DOI: 10.5796/electrochemistry.78.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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15
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Zu SZ, Sun XX, Liu Y, Han BH. Supramolecular Surface Modification and Solubilization of Single-Walled Carbon Nanotubes with Cyclodextrin Complexation. Chem Asian J 2009; 4:1562-72. [DOI: 10.1002/asia.200900119] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Fujigaya T, Nakashima N. Methodology for Homogeneous Dispersion of Single-walled Carbon Nanotubes by Physical Modification. Polym J 2008. [DOI: 10.1295/polymj.pj2008039] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Kuzuhara T, Suganuma M, Fujiki H. Green tea catechin as a chemical chaperone in cancer prevention. Cancer Lett 2008; 261:12-20. [PMID: 18068893 DOI: 10.1016/j.canlet.2007.10.037] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Accepted: 10/30/2007] [Indexed: 11/18/2022]
Abstract
Green tea catechins have recently gained significant acceptance as a cancer preventive, and one of the important features of catechins is their interactions with various target molecules. We recently found a functional and structural similarity between catechins and chaperones: Stochastic conformational analysis in silico revealed numerous conformations of (-)-epigallocatechin gallate, (-)-epicatechin gallate and (-)-epigallocatechin, showing a unique flexibility and mobility of the catechin molecules and suggesting the significance of a galloyl group in conformational variation. Since these conformations result in interaction with various types of molecules, we think that green tea catechin induces cancer preventive activity mediated through a chaperone-like property.
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Affiliation(s)
- Takashi Kuzuhara
- Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
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