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Three-dimensional NiO/Co 3O 4@C composite for high-performance non-enzymatic glucose sensor. ANAL SCI 2023; 39:33-42. [PMID: 36208409 DOI: 10.1007/s44211-022-00193-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/21/2022] [Indexed: 01/06/2023]
Abstract
In this study, a new enzyme-free glucose sensor was constructed using the transition metal-based composite material. The synthesis of ZIF-67 entailed the addition of NiO with high catalytic performance. Two-dimensional NiO/Co3O4@C heterojunctions were obtained via pyrolysis of NiO@ZIF-67 in the air at a temperature of 500 ℃. The enzyme-free glucose sensor Nafion/NiO/Co3O4@C/GCE was constructed by modifying NiO/Co3O4@C on a glassy carbon electrode (GCE). The performance of the modified electrode was tested via cyclic voltammetry (CV) and a time-current curve (i-t curve). The linear ranges of the modified electrode were 5 -1000 μM and 1.0- 4.0 mM with sensitivities of 690 and 215.4 μA mM-1 cm-2, respectively. The detection limit was 2.28 μΜ (S/N = 3). The recoveries were in the range of 98.9-99.7% during the detection of real samples. The prepared sensor Nafion/NiO/Co3O4@C/GCE showed excellent electrocatalytic properties with superb reproducibility, stability and anti-interference capability. The sensor has been successfully utilized to determine glucose in real serum samples.
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2
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Aravind M, Kumarisubitha T, Ahmed N, Velusamy P. DFT, Molecular docking, Photocatalytic and Antimicrobial activity of coumarin enriched Cinnamon barkextract mediated silver nanoparticles. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Chauhan V, Dhiman VK, Mahajan G, Pandey A, Kanwar SS. Synthesis and characterization of silver nanoparticles developed using a novel lipopeptide(s) biosurfactant and evaluating its antimicrobial and cytotoxic efficacy. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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4
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Synthesis and characterization of Vitis vinifera exocarp-mediated ZnO nanoparticles: An evaluation of biological potential and ecotoxicity. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Bayat R, Bingül Reçber Z, Bekmezci M, Nas MS, Calimli MH, Demirbas O, Akin M, Şen F. Synthesis and application of AuNi@AC nano adsorbents for the removal of Maxilon Blue 5G azo dye from aquatic mediums. Food Chem Toxicol 2022; 167:113303. [PMID: 35850400 DOI: 10.1016/j.fct.2022.113303] [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: 06/14/2022] [Revised: 07/04/2022] [Accepted: 07/12/2022] [Indexed: 10/17/2022]
Abstract
In this research, gold-nicel supported on activated carbon (AC) nanoadsorbent (AuNi@AC) synthesized by following a series of physicochemical procedures was prepared for the removal of Maxilon Blue 5G (MB) which is a cationic textile dye. Experimental studies based on parameters specifically pH, contact time, nano catalytic adsorbent particle, initial MB dye concentration and temperature effect were conducted in aqueous solutions in a batch system. AuNi@AC nanoadsorbents (NAs) reached the equilibrium in 30 min under optimum conditions in adsorption of the dye. The pseudo-first, second-order, and intra-particle diffusion models were tested to evaluate a the experimental results. Adsorption kinetics were found to be represented by the pseudo-second-order model, and the maximum adsorption capacity (qmax.) was calculated to be 542.90 mg/g (or 2.041 mmol/g). The synthesized magnetic AuNi@AC nanoadsorbent showed a high-efficiency reusability effect of about 64% after five reuse runs. Also, thermodynamic function parameters such as activation energy (Ea), Gibbs free energy (ΔG *), and entropy (ΔS *) were investigated in the sorption study. After all evaluation of data, it was concluded that the novel AuNi@AC nanoadsorbent could be considered as an effective support material for the removal of various organic pollutants in aquation solution especially for the removal of MB.
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Affiliation(s)
- Ramazan Bayat
- Faculty of Science, Department of Biochemistry, Dumlupınar University, Kütahya, Turkey; Department of Materials Science & Engineering, Faculty of Engineering, Dumlupinar University, Kutahya, Turkey
| | - Züleyha Bingül Reçber
- Faculty of Engineering, Environmental Engineering Department, Igdir University, Igdir, Turkey
| | - Muhammed Bekmezci
- Faculty of Science, Department of Biochemistry, Dumlupınar University, Kütahya, Turkey; Department of Materials Science & Engineering, Faculty of Engineering, Dumlupinar University, Kutahya, Turkey
| | - Mehmet Salih Nas
- Faculty of Engineering, Environmental Engineering Department, Igdir University, Igdir, Turkey; Research Laboratory and Application Center (ALUM), Igdir University, Igdir, Turkey.
| | - Mehmet Harbi Calimli
- Tuzluca Vocational School, Igdir University, Igdir, Turkey; Research Laboratory and Application Center (ALUM), Igdir University, Igdir, Turkey.
| | - Ozkan Demirbas
- Department of Chemistry, Faculty of Science and Literature, University of Balikesir, Balikesir, Turkey
| | - Merve Akin
- Faculty of Science, Department of Biochemistry, Dumlupınar University, Kütahya, Turkey; Department of Materials Science & Engineering, Faculty of Engineering, Dumlupinar University, Kutahya, Turkey
| | - Fatih Şen
- Faculty of Science, Department of Biochemistry, Dumlupınar University, Kütahya, Turkey.
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The Kinetic Parameters of Adsorption of Enzymes Using Carbon-Based Materials Obtained from Different Food Wastes. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00635-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Çalımlı MH, Demirbaş Ö, Aygün A, Alma MH, Nas MS, Khan A, Asiri AM, Şen F. Equilibrium, Kinetics and Thermodynamics of Bovine Serum Albumin from Carbon Based Materials Obtained from Food Wastes. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00633-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Demirbaş Ö, Çalımlı MH, Demirkan B, Alma MH, Nas MS, Khan A, Asiri AM, Şen F. Thermodynamics, Kinetics, and Adsorption Properties of Biomolecules onto Carbon-Based Materials Obtained from Food Wastes. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00628-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Demirbas O, Calimli MH, Kuyuldar E, Alma MH, Nas MS, Sen F. Equilibrium, Kinetics, and Thermodynamic of Adsorption of Enzymes on Diatomite Clay Materials. BIONANOSCIENCE 2019. [DOI: 10.1007/s12668-019-00615-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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11
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Savk A, Özdil B, Demirkan B, Nas MS, Calimli MH, Alma MH, Inamuddin, Asiri AM, Şen F. Multiwalled carbon nanotube-based nanosensor for ultrasensitive detection of uric acid, dopamine, and ascorbic acid. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:248-254. [PMID: 30889697 DOI: 10.1016/j.msec.2019.01.113] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 01/21/2019] [Accepted: 01/25/2019] [Indexed: 10/27/2022]
Abstract
A novel multiwalled carbon nanotube (MWCNT) based sensor was fabricated as a highly precise and stable electrochemical sensor. The synthesized sensor which consists of ZnNi bimetallic nanoalloy called the ZnNi NPs@f-MWCNT sensor, have been used for the simultaneous detection of uric acid (UA), dopamine (DA) and ascorbic acid (AA). The ZnNi NPs@f-MWCNT sensor obtained based on the microwave irradiation process, and its characterization was performed by using several physical techniques such as XRD, XPS, TEM, Raman, etc. The characterization showed that this sensor has excellent properties such as rich pore channels, excellent structural durability, and large surface area. These properties facilitated mass transfer and electron conductions. It was observed that the obtained sensor gave high electrochemical activity and wide linear responses (0.3-1.1 mM AA, 0.2-1.2 mM DA, 0.2-1.1 mM UA) in the detection of uric acid (UA), dopamine (DA) and ascorbic acid (AA). In addition to these properties, it has been found that the sensor has excellent anti-interferents properties towards AlCl3, KCl3, glucose, etc. and ZnNi NPs@f-MWCNT sensor was further applied to determine uric acid (UA), dopamine (DA) and ascorbic acid (AA) in real samples.
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Affiliation(s)
- Aysun Savk
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Turkey
| | - Buse Özdil
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Turkey
| | - Buse Demirkan
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Turkey
| | - Mehmet Salih Nas
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Turkey; Department of Environmental Engineering, Faculty of Engineering, University of Igdir, Igdir, Turkey
| | - Mehmet Harbi Calimli
- Department of Environmental Engineering, Faculty of Engineering, University of Igdir, Igdir, Turkey
| | - Mehmet Hakkı Alma
- Department of Environmental Engineering, Faculty of Engineering, University of Igdir, Igdir, Turkey
| | - Inamuddin
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Abdullah M Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Fatih Şen
- Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Turkey.
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Recent advances in electrochemical non-enzymatic glucose sensors - A review. Anal Chim Acta 2018; 1033:1-34. [PMID: 30172314 DOI: 10.1016/j.aca.2018.05.051] [Citation(s) in RCA: 326] [Impact Index Per Article: 54.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/23/2018] [Accepted: 05/18/2018] [Indexed: 12/13/2022]
Abstract
This review encompasses the mechanisms of electrochemical glucose detection and recent advances in non-enzymatic glucose sensors based on a variety of materials ranging from platinum, gold, metal alloys/adatom, non-precious transition metal/metal oxides to glucose-specific organic materials. It shows that the discovery of new materials based on unique nanostructures have not only provided the detailed insight into non-enzymatic glucose oxidation, but also demonstrated the possibility of direct detection in whole blood or interstitial fluids. We critically evaluate various aspects of non-enzymatic electrochemical glucose sensors in terms of significance as well as performance. Beyond laboratory tests, the prospect of commercialization of non-enzymatic glucose sensors is discussed.
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Kunai Y, Liu AT, Cottrill AL, Koman VB, Liu P, Kozawa D, Gong X, Strano MS. Observation of the Marcus Inverted Region of Electron Transfer from Asymmetric Chemical Doping of Pristine (n,m) Single-Walled Carbon Nanotubes. J Am Chem Soc 2017; 139:15328-15336. [DOI: 10.1021/jacs.7b04314] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuichiro Kunai
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Albert Tianxiang Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Anton L. Cottrill
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Volodymyr B. Koman
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Pingwei Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Daichi Kozawa
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Xun Gong
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Michael S. Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Yeo T, Hwang H, Shin D, Seo B, Choi W. Thermoelectric-pyroelectric hybrid energy generation from thermopower waves in core-shell structured carbon nanotube-PZT nanocomposites. NANOTECHNOLOGY 2017; 28:065403. [PMID: 28052049 DOI: 10.1088/1361-6528/aa5277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
There is an urgent need to develop a suitable energy source owing to the rapid development of various innovative devices using micro-nanotechnology. The thermopower wave (TW), which produces a high specific power during the combustion of solid fuel inside micro-nanostructure materials, is a unique energy source for unusual platforms that cannot use conventional energy sources. Here, we report on the significant enhancement of hybrid energy generation of pyroelectrics and thermoelectrics from TWs in carbon nanotube (CNT)-PZT (lead zirconate titanate, P(Z0.5-T0.5)) composites for the first time. Conventional TWs use only charge carrier transport driven by the temperature gradient along the core materials to produce voltage. In this study, a core-shell structure of CNTs-PZTs was prepared to utilize both the temperature gradient along the core material (thermoelectrics) and the dynamic change in the temperature of the shell structure (pyroelectrics) induced by TWs. The dual mechanism of energy generation in CNT-PZT composites amplified the average peak and duration of the voltage up to 403 mV and 612 ms, respectively, by a factor of 2 and 60 times those for the composites without a PZT layer. Furthermore, dynamic voltage measurements and structural analysis in repetitive TWs confirmed that CNT-PZT composites maintain the original performance in multiple TWs, which improves the reusability of materials. The advanced TWs obtained by the application of a PZT layer as a pyroelectric material contributes to the extension of the usable energy portion as well as the development of TW-based operating devices.
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Affiliation(s)
- Taehan Yeo
- School of Mechanical Engineering, Korea University, Seoul 136-701, Korea
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15
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Yildiz Y, Okyay TO, Sen B, Gezer B, Kuzu S, Savk A, Demir E, Dasdelen Z, Sert H, Sen F. Highly Monodisperse Pt/Rh Nanoparticles Confined in the Graphene Oxide for Highly Efficient and Reusable Sorbents for Methylene Blue Removal from Aqueous Solutions. ChemistrySelect 2017. [DOI: 10.1002/slct.201601608] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yunus Yildiz
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Tugba Onal Okyay
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
- Department of Chemical Engineering; Usak University; Turkey
| | - Betül Sen
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Bahdisen Gezer
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
- Department of Electrical - Electronic Engineering; Usak University; Turkey
| | - Sultan Kuzu
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Aysun Savk
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Enes Demir
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Zeynep Dasdelen
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
| | - Hakan Sert
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
- Department of Chemical Engineering; Usak University; Turkey
| | - Fatih Sen
- Sen Research Group,Deparment of Biochemistry; Dumlupınar University; Turkey
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16
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Shin D, Hwang H, Yeo T, Seo B, Choi W. Thermopower Wave-Driven Hybrid Supercapacitor Charging System. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31042-31050. [PMID: 27797172 DOI: 10.1021/acsami.6b11334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The development of new energy sources and harvesting methods has increased with the rapid development of multiscale wireless and portable systems. A thermopower wave (TW) is a potential portable energy source that exhibits a high power density. TWs generate electrical energy via the transport of charges inside micro- or nanostructured materials. This transport is induced by self-propagating combustion. Despite the high specific power of TWs, the generation of energy by TWs is transient, making a TW device a one-time use source, which is a critical limitation on the further advancement of this technology. Herein, we first report the development of a hybrid supercapacitor charging system driven by consecutive TWs to accumulate multiple amounts of energy generated by the repetitive combustion of the chemical fuel. In this study, hybrid layers composed of a supercapacitor (poly(vinyl alcohol)/MnO2/nickel) and solid fuel layer (nitrocellulose film) were fabricated as one integrated platform. Combustion was initiated by the ignition of the fuel layer, resulting in the production of electrical energy, attributed to the potential difference between two electrodes, and the transport of charges inside one of the electrodes. Electrical energy could simultaneously and directly charge the supercapacitor, and the discharged voltage could be significantly increased in comparison with the voltage level before the application of a TW. Furthermore, the application of multiple TWs in succession in the hybrid supercapacitor charging system successfully allowed for stack voltage amplification, which was synchronized to each TW. The results of this study could be used to understand the underlying phenomena for charging supercapacitors with the variation of thermal energy and to advance the application of TWs as more efficient, practical energy sources.
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Affiliation(s)
- Dongjoon Shin
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
| | - Hayoung Hwang
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
| | - Taehan Yeo
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
| | - Byungseok Seo
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
| | - Wonjoon Choi
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
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17
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Liu AT, Kunai Y, Liu P, Kaplan A, Cottrill AL, Smith-Dell JS, Strano MS. Electrical Energy Generation via Reversible Chemical Doping on Carbon Nanotube Fibers. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:9752-9757. [PMID: 27717011 DOI: 10.1002/adma.201602305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Chemically modified carbon nanotube fibers enable unique power sources driven entirely by a chemical potential gradient. Electrical current (11.9 μA mg-1 ) and potential (525 mV) are reversibly produced by localized acetonitrile doping under ambient conditions. An inverse length-scaling of the maximum power as L-1.03 that creates specific powers as large as 30.0 kW kg-1 highlights the potential for microscale energy generation.
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Affiliation(s)
- Albert Tianxiang Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Yuichiro Kunai
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Pingwei Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Amir Kaplan
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Anton L Cottrill
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Jamila S Smith-Dell
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
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Lee KY, Hwang H, Kim TH, Choi W. Enhanced Photocatalytic Activity of Bismuth Precursor by Rapid Phase and Surface Transformation Using Structure-Guided Combustion Waves. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3366-3375. [PMID: 26765959 DOI: 10.1021/acsami.5b11338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The development of an efficient method for manipulating phase and surface transformations would facilitate the improvement of catalytic materials for use in a diverse range of applications. Herein, we present the first instance of a submicrosecond time frame direct phase and surface transformation of Bi(NO3)3 rods to nanoporous β-Bi2O3 rods via structure-guided combustion waves. Hybrid composites of the prepared Bi(NO3)3·H2O rods and organic fuel were fabricated by a facile preparation method. The anisotropic propagation of combustion waves along the interfacial boundaries of Bi(NO3)3·H2O rods induced direct phase transformation to β-Bi2O3 rods in the original structure due to the rapid pyrolysis, while the release of gas molecules enabled the formation of nanoporous structures on the surfaces of rods. The developed β-Bi2O3 rods showed improved photocatalytic activity for the photodegradation of rhodamine B in comparison with Bi(NO3)3·H2O rods and α-Bi2O3 rods due to the more suitable interdistance and the large contact areas of the porous surfaces. This new method of using structure-guided combustion waves for phase and surface transformation may contribute to the development of new catalysts as well as the precise manipulation of diverse micronanostructured materials.
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Affiliation(s)
- Kang Yeol Lee
- School of Mechanical Engineering, Korea University (BK21+) , Seoul 136-701, Korea
| | - Hayoung Hwang
- School of Mechanical Engineering, Korea University (BK21+) , Seoul 136-701, Korea
| | - Tae Ho Kim
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University , Jinju 660-701, Korea
| | - Wonjoon Choi
- School of Mechanical Engineering, Korea University (BK21+) , Seoul 136-701, Korea
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Lee KY, Hwang H, Shin D, Choi W. Manipulation of combustion waves in carbon-nanotube/fuel composites by highly reactive Mg nanoparticles. NANOSCALE 2015; 7:17071-17078. [PMID: 26419765 DOI: 10.1039/c5nr03795f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Manipulating the interface of micro/nanostructured materials and chemical fuels can change the fundamental characteristics of combustion waves that are generated during a reaction. In this study, we report that Mg/MgO nanoparticles actively amplify the propagation of combustion waves at the interface of multi-walled carbon nanotubes (MWCNTs) and chemical fuels. Fuel/MWCNT and fuel/MWCNT-Mg/MgO composite films were prepared by a facile synthetic method. We present complete physiochemical characterization of these composite films and evaluate the propagating velocities and real-time surface temperatures of combustion waves. Mg/MgO nanoparticles at the interface enhanced the reaction front velocity by 41%. The resulting explosive reactions supplied additional thermal energy to the chemical fuel, accelerating flame propagation. Furthermore, the surface temperatures of the composites with Mg/MgO nanoparticles were much lower, indicating how the transient heat from the reaction would ignite the unreacted fuels at lower surface temperatures despite not reaching the necessary activation energy for a chain reaction. This mechanism contributed to thermopower waves that amplified the output voltage. Furthermore, large temperature gradients due to the presence of nanoparticles increased charge transport inside the nanostructured material, due to the increased thermoelectric effects. This manipulation could contribute to the active control of interfacially driven combustion waves along nanostructured materials, yielding many potential applications.
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Affiliation(s)
- Kang Yeol Lee
- School of Mechanical Engineering, Korea University (BK21+), Seoul, Korea136-701.
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Lee KY, Hwang H, Choi W. Phase Transformations of Cobalt Oxides in CoxOy-ZnO Multipod Nanostructures via Combustion from Thermopower Waves. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:4762-4773. [PMID: 26136292 DOI: 10.1002/smll.201501038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/27/2015] [Indexed: 06/04/2023]
Abstract
The study of combustion at the interfaces of materials and chemical fuels has led to developments in diverse fields such as materials chemistry and energy conversion. Recently, it has been suggested that thermopower waves can utilize chemical-thermal-electrical-energy conversion in hybrid structures comprising nanomaterials and combustible fuels to produce enhanced combustion waves with concomitant voltage generation. In this study, this is the first time that the direct phase transformation of Co-doped ZnO via instant combustion waves and its applications to thermopower waves is presented. It is demonstrated that the chemical combustion waves at the surfaces of Co3O4-ZnO multipod nanostructures (deep brown in color) enable direct phase transformations to newly formed CoO-ZnO(1-x) nanoparticles (olive green in color). The oxygen molecules are released from Co3O4-ZnO to CoO-ZnO(1-x) under high-temperature conditions in the reaction front regime in combustion, whereas the CoO-ZnO multipod nanoparticles do not undergo any transformations and thus do not experience any color change. This oxygen-release mechanism is applicable to thermopower waves, enhances the self-propagating combustion velocity, and forms lattice defects that interrupt the charge-carrier movements inside the nanostructures. The chemical transformation and corresponding energy transport observed in this study can contribute to diverse potential applications, including direct-combustion synthesis and energy conversion.
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Affiliation(s)
- Kang Yeol Lee
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
| | - Hayoung Hwang
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
| | - Wonjoon Choi
- School of Mechanical Engineering, Korea University, Seoul, 136-701, Korea
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Yeo T, Hwang H, Cho Y, Shin D, Choi W. Voltage amplification of thermopower waves via current crowding at high resistances in self-propagating combustion waves. NANOTECHNOLOGY 2015; 26:305402. [PMID: 26159116 DOI: 10.1088/0957-4484/26/30/305402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Combustion wave propagation in micro/nanostructured materials generates a chemical-thermal-electrical energy conversion, which enables the creation of an unusual source of electrical energy, called a thermopower wave. In this paper, we report that high electrical resistance regimes would significantly amplify the output voltage of thermopower waves, because the current crowding creates a narrow path for charge carrier transport. We show that the structurally defective regions in the hybrid composites of chemical fuels and carbon nanotube (CNT) arrays determine both the resistance levels of the hybrid composites and the corresponding output voltage of thermopower waves. A sudden acceleration of the crowded charges would be induced by the moving reaction front of the combustion wave when the supplied driving force overcomes the potential barrier to cause charge carrier transport over the defective region. This property is investigated experimentally for the locally manipulated defective areas using diverse methods. In this study, thermopower waves in CNT-based hybrid composites are able to control the peak voltages in the range of 10-1000 mV by manipulating the resistance from 10 Ω to 100 kΩ. This controllable voltage generation from thermopower waves may enable applications using the combustion waves in micro/nanostructured materials and better understanding of the underlying physics.
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Affiliation(s)
- Taehan Yeo
- School of Mechanical Engineering, Korea University, Seoul 136-701, Korea
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Yeo T, Hwang H, Jeong DC, Lee KY, Hong J, Song C, Choi W. Effects of chemical fuel composition on energy generation from thermopower waves. NANOTECHNOLOGY 2014; 25:445403. [PMID: 25319506 DOI: 10.1088/0957-4484/25/44/445403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Thermopower waves, which occur during combustion within hybrid structures formed from nanomaterials and chemical fuels, result in a self-propagating thermal reaction and concomitantly generate electrical energy from the acceleration of charge carriers along the nanostructures. The hybrid structures for thermopower waves are composed of two primary components: the core thermoelectric material and the combustible fuel. So far, most studies have focused on investigating various nanomaterials for improving energy generation. Herein, we report that the composition of the chemical fuel used has a significant effect on the power generated by thermopower waves. Hybrid nanostructures consisting of mixtures of picric acid and picramide with sodium azide were synthesized and used to generate thermopower waves. A maximum voltage of ∼2 V and an average peak specific power as high as 15 kW kg(-1) were obtained using the picric acid/sodium azide/multiwalled carbon nanotubes (MWCNTs) array composite. The average reaction velocity and the output voltage in the case of the picric acid/sodium azide were 25 cm s(-1) and 157 mV, while they were 2 cm s(-1) and 3 mV, in the case of the picramide/sodium azide. These marked differences are attributable to the chemical and structural differences of the mixtures. Mixing picric acid and sodium azide in deionized water resulted in the formation of 2,4,6-trinitro sodium phenoxide and hydrogen azide (H-N3), owing to the exchange of H(+) and Na(+) ions, as well as the formation of fiber-like structures, because of benzene π stacking. The negative enthalpy of formation of the new compounds and the fiber-like structures accelerate the reaction and increase the output voltage. Elucidating the effects of the composition of the chemical fuel used in the hybrid nanostructures will allow for the control of the combustion process and help optimize the energy generated from thermopower waves, furthering the development of thermopower waves as an energy source.
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Affiliation(s)
- Taehan Yeo
- School of Mechanical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea
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Lee KY, Hwang H, Choi W. Advanced thermopower wave in novel ZnO nanostructures/fuel composite. ACS APPLIED MATERIALS & INTERFACES 2014; 6:15575-15582. [PMID: 25133980 DOI: 10.1021/am504507w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Thermopower wave is a new concept of energy conversion from chemical to thermal to electrical energy, produced from the chemical reaction in well-designed hybrid structures between nanomaterials and combustible fuels. The enhancement and optimization of energy generation is essential to make it useful for future applications. In this study, we demonstrate that simple solution-based synthesized zinc oxide (ZnO) nanostructures, such as nanorods and nanoparticles are capable of generating high output voltage from thermopower waves. In particular, an astonishing improvement in the output voltage (up to 3 V; average 2.3 V) was achieved in a ZnO nanorods-based composite film with a solid fuel (collodion, 5% nitrocellulose), which generated an exothermic chemical reaction. Detailed analyses of thermopower waves in ZnO nanorods- and cube-like nanoparticles-based hybrid composites have been reported in which nanostructures, output voltage profile, wave propagation velocities, and surface temperature have been characterized. The average combustion velocities for a ZnO nanorods/fuel and a ZnO cube-like nanoparticles/fuel composites were 40.3 and 30.0 mm/s, while the average output voltages for these composites were 2.3 and 1.73 V. The high output voltage was attributed to the amplified temperature in intermixed composite of ZnO nanostructures and fuel due to the confined diffusive heat transfer in nanostructures. Moreover, the extended interfacial areas between ZnO nanorods and fuel induced large amplification in the dynamic change of the chemical potential, and it resulted in the enhanced output voltage. The differences of reaction velocity and the output voltage between ZnO nanorods- and ZnO cube-like nanoparticles-based composites were attributed to variations in electron mobility and grain boundary, as well as thermal conductivities of ZnO nanorods and particles. Understanding this astonishing increase and the variation of the output voltage and reaction velocity, precise ZnO nanostructures, will help in formulating specific strategies for obtaining enhanced energy generation from thermopower waves.
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Affiliation(s)
- Kang Yeol Lee
- School of Mechanical Engineering, Korea University , Seoul 136-701, Korea
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