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Maqbool Q, Dobrezberger K, Stropp J, Huber M, Kontrus KL, Aspalter A, Neuhauser J, Schachinger T, Löffler S, Rupprechter G. Bimetallic CuPd nanoparticles supported on ZnO or graphene for CO 2 and CO conversion to methane and methanol. RSC SUSTAINABILITY 2024:d4su00339j. [PMID: 39323512 PMCID: PMC11418587 DOI: 10.1039/d4su00339j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Accepted: 09/02/2024] [Indexed: 09/27/2024]
Abstract
Carbon dioxide (CO2) and carbon monoxide (CO) hydrogenation to methane (CH4) or methanol (MeOH) is a promising pathway to reduce CO2 emissions and to mitigate dependence on rapidly depleting fossil fuels. Along these lines, a series of catalysts comprising copper (Cu) or palladium (Pd) nanoparticles (NPs) supported on zinc oxide (ZnO) as well as bimetallic CuPd NPs supported on ZnO or graphene were synthesized via various methodologies. The prepared catalysts underwent comprehensive characterization via high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX) mapping, electron energy loss spectroscopy (EELS), X-ray diffraction (XRD), hydrogen temperature-programmed reduction and desorption (H2-TPR and H2-TPD), and deuterium temperature-programmed desorption (D2O-TPD). In the CO2 hydrogenation process carried out at 20 bar and elevated temperatures (300 to 500 °C), Cu, Pd, and CuPd NPs (<5 wt% loading) supported on ZnO or graphene predominantly yielded CH4 as the primary product, with CO generated as a byproduct via the reverse water gas shift (RWGS) reaction. For CO hydrogenation between 400 and 500 °C, the CO conversion was at least 40% higher than the CO2 conversion, with CH4 and CO2 identified as the main products, the latter from water gas shift. Employing 90 wt% Cu on ZnO led to an enhanced CO conversion of 14%, with the MeOH yield reaching 10% and the CO2 yield reaching 4.3% at 230 °C. Overall, the results demonstrate that lower Cu/Pd loading (<5 wt%) supported on ZnO/graphene favored CH4 production, while higher Cu content (90 wt%) promoted MeOH production, for both CO2 and CO hydrogenation at high pressure.
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Affiliation(s)
- Qaisar Maqbool
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Klaus Dobrezberger
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Julian Stropp
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Martin Huber
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Karl-Leopold Kontrus
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Anna Aspalter
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Julie Neuhauser
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Thomas Schachinger
- University Service Center for Transmission Electron Microscopy, TU Wien Stadionallee 2/057-02 1020 Vienna Austria
| | - Stefan Löffler
- University Service Center for Transmission Electron Microscopy, TU Wien Stadionallee 2/057-02 1020 Vienna Austria
| | - Günther Rupprechter
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
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2
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Gordijo J, Rodrigues NM, Martins JBL. CO 2 and CO Capture on the ZnO Surface: A GCMC and Electronic Structure Study. ACS OMEGA 2023; 8:46830-46840. [PMID: 38107956 PMCID: PMC10719999 DOI: 10.1021/acsomega.3c06378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 10/31/2023] [Accepted: 11/10/2023] [Indexed: 12/19/2023]
Abstract
The amount of polluting gases released into the atmosphere has grown drastically. Among them, it is possible to cite the release of CO2 and CO gases on a large scale as one of the products of the complete and incomplete combustion of petroleum-derived fuels. It is worth noting that the production of energy by burning fossil fuels supplies the energy demand but causes environmental damage, and several studies have addressed the reduction. One of them is using materials with the potential to capture these gases. The experimental and theoretical studies have significant contributions that promote advances in this area. Among the materials investigated, ZnO has emerged, demonstrating the considerable potential for capturing various gases, including CO2 and CO. This work used density functional theory (DFT) and Grand Canonical Monte Carlo Method (GCMC) to investigate the adsorption of CO2 and CO on the surface of Zinc oxide (ZnO) to obtain adsorption isotherms and interaction energy and the interaction nature. The results suggest that CO2 adsorption slightly changed the angle of the O-C-O to values less than 180°. For the CO, its carbon atom interacts simultaneously with Zn and O of the ZnO surface. However, CO interactions have an ionic character with a lower binding energy value than the CO2 interaction. The energies calculated using the PM6 and DFT methods generated results compatible with the experimental values. In applications involving a mixture of these two gases, the adsorption of CO2 should be favored, and there may be inhibition of the adsorption of CO for high CO2 concentrations.
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Affiliation(s)
- Julia
Silva Gordijo
- Universidade de Brasília,
Instituto de Química, 70910-900 Brasília, DF, Brazil
| | | | - João B. L. Martins
- Universidade de Brasília,
Instituto de Química, 70910-900 Brasília, DF, Brazil
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3
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Dervieux E, Théron M, Uhring W. Carbon Dioxide Sensing-Biomedical Applications to Human Subjects. SENSORS (BASEL, SWITZERLAND) 2021; 22:188. [PMID: 35009731 PMCID: PMC8749784 DOI: 10.3390/s22010188] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/13/2021] [Accepted: 12/20/2021] [Indexed: 02/06/2023]
Abstract
Carbon dioxide (CO2) monitoring in human subjects is of crucial importance in medical practice. Transcutaneous monitors based on the Stow-Severinghaus electrode make a good alternative to the painful and risky arterial "blood gases" sampling. Yet, such monitors are not only expensive, but also bulky and continuously drifting, requiring frequent recalibrations by trained medical staff. Aiming at finding alternatives, the full panel of CO2 measurement techniques is thoroughly reviewed. The physicochemical working principle of each sensing technique is given, as well as some typical merit criteria, advantages, and drawbacks. An overview of the main CO2 monitoring methods and sites routinely used in clinical practice is also provided, revealing their constraints and specificities. The reviewed CO2 sensing techniques are then evaluated in view of the latter clinical constraints and transcutaneous sensing coupled to a dye-based fluorescence CO2 sensing seems to offer the best potential for the development of a future non-invasive clinical CO2 monitor.
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Affiliation(s)
- Emmanuel Dervieux
- BiOSENCY, 1137a Avenue des Champs Blancs, 35510 Cesson-Sévigné, France
| | - Michaël Théron
- ORPHY, Université de Bretagne Occidentale, 6 Avenue Victor le Gorgeu, 29238 Brest, France;
| | - Wilfried Uhring
- ICube, University of Strasbourg and CNRS, 23 rue du Loess, CEDEX, 67037 Strasbourg, France;
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4
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Mikhailov M, Yuryev S, Neshchimenko V, Sokolovskiy A. Optical properties and photostability of silicon dioxide powders modified with SiO2 hollow particles and nanoparticles of various oxides. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Rawal TB, Acharya SR, Hong S, Le D, Tang Y, Tao FF, Rahman TS. High Catalytic Activity of Pd1/ZnO(101̅0) toward Methanol Partial Oxidation: A DFT+KMC Study. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04504] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takat B. Rawal
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - Shree Ram Acharya
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - Sampyo Hong
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
- Division of Physical Sciences, Brewton-Parker College, Mount Vernon, Georgia 30445, United States
| | - Duy Le
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - Yu Tang
- Department of Chemical and Petroleum Engineering, and Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Franklin Feng Tao
- Department of Chemical and Petroleum Engineering, and Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Talat S. Rahman
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
- Donostia International Physics Center, Donostia-San Sebastian 20018, Spain
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Newberg JT, Goodwin C, Arble C, Khalifa Y, Boscoboinik JA, Rani S. ZnO(101̅0) Surface Hydroxylation under Ambient Water Vapor. J Phys Chem B 2017; 122:472-478. [DOI: 10.1021/acs.jpcb.7b03335] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John T. Newberg
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Chris Goodwin
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Chris Arble
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Yehia Khalifa
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - J. Anibal Boscoboinik
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Sana Rani
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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7
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Ling L, Zhao Z, Wang B, Fan M, Zhang R. Effects of CO and CO2 on the desulfurization of H2S using a ZnO sorbent: a density functional theory study. Phys Chem Chem Phys 2016; 18:11150-6. [DOI: 10.1039/c6cp01422d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of COS via the reaction of CO and H2S is easier than that of CO2 and H2S over the ZnO surface.
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Affiliation(s)
- Lixia Ling
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
- Department of Chemical and Petroleum Engineering
| | - Zhongbei Zhao
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan 030024
- P. R. China
| | - Baojun Wang
- Key Laboratory of Coal Science and Technology (Taiyuan University of Technology)
- Ministry of Education and Shanxi Province
- Taiyuan 030024
- People's Republic of China
| | - Maohong Fan
- Department of Chemical and Petroleum Engineering
- The University of Wyoming
- Laramie
- USA
| | - Riguang Zhang
- Key Laboratory of Coal Science and Technology (Taiyuan University of Technology)
- Ministry of Education and Shanxi Province
- Taiyuan 030024
- People's Republic of China
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8
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Effects of interface modification with self-assembled monolayers on the photovoltaic performance of CdS quantum dots sensitized solar cells. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.190] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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9
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Fernando A, Weerawardene KLDM, Karimova NV, Aikens CM. Quantum Mechanical Studies of Large Metal, Metal Oxide, and Metal Chalcogenide Nanoparticles and Clusters. Chem Rev 2015; 115:6112-216. [PMID: 25898274 DOI: 10.1021/cr500506r] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Amendra Fernando
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | | | - Natalia V Karimova
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Christine M Aikens
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
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10
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Chung LW, Sameera WMC, Ramozzi R, Page AJ, Hatanaka M, Petrova GP, Harris TV, Li X, Ke Z, Liu F, Li HB, Ding L, Morokuma K. The ONIOM Method and Its Applications. Chem Rev 2015; 115:5678-796. [PMID: 25853797 DOI: 10.1021/cr5004419] [Citation(s) in RCA: 760] [Impact Index Per Article: 84.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Lung Wa Chung
- †Department of Chemistry, South University of Science and Technology of China, Shenzhen 518055, China
| | - W M C Sameera
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan
| | - Romain Ramozzi
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan
| | - Alister J Page
- §Newcastle Institute for Energy and Resources, The University of Newcastle, Callaghan 2308, Australia
| | - Miho Hatanaka
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan
| | - Galina P Petrova
- ∥Faculty of Chemistry and Pharmacy, University of Sofia, Bulgaria Boulevard James Bourchier 1, 1164 Sofia, Bulgaria
| | - Travis V Harris
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan.,⊥Department of Chemistry, State University of New York at Oswego, Oswego, New York 13126, United States
| | - Xin Li
- #State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhuofeng Ke
- ∇School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Fengyi Liu
- ○Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
| | - Hai-Bei Li
- ■School of Ocean, Shandong University, Weihai 264209, China
| | - Lina Ding
- ▲School of Pharmaceutical Sciences, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, China
| | - Keiji Morokuma
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4 Takano Nishihiraki-cho, Sakyo, Kyoto 606-8103, Japan
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11
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Shanmugam R, Thamaraichelvan A, Viswanathan B. Methanol formation by catalytic hydrogenation of CO2 on a nitrogen doped zinc oxide surface: an evaluative study on the mechanistic pathway by density functional theory. RSC Adv 2015. [DOI: 10.1039/c5ra10581a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Computational evaluation of reaction pathway for simultaneous activation of CO2 and water on N doped ZnO surface revealed carbamate mediated methanol formation.
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Affiliation(s)
- Ramasamy Shanmugam
- Department of Chemistry
- Thiagarajar College
- Madurai
- India
- National Center for Catalysis Research
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12
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CO, CO2 and H2 adsorption on ZnO, CeO2, and ZnO/CeO2 surfaces: DFT simulations. J Mol Model 2014; 20:2270. [DOI: 10.1007/s00894-014-2270-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 04/23/2014] [Indexed: 11/26/2022]
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13
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CO2 adsorption on polar surfaces of ZnO. J Mol Model 2012; 19:2069-78. [DOI: 10.1007/s00894-012-1636-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 10/07/2012] [Indexed: 10/27/2022]
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14
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Boulet P, Knöfel C, Kuchta B, Hornebecq V, Llewellyn PL. Computational investigation of the adsorption of carbon dioxide onto zirconium oxide clusters. J Mol Model 2012; 18:4819-30. [PMID: 22707280 DOI: 10.1007/s00894-012-1486-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Accepted: 05/28/2012] [Indexed: 11/25/2022]
Abstract
A theoretical investigation of the adsorption of CO₂ onto ZrO₂ is presented. Various cluster models were used to mimic different basic and acidic sites on the surface. The method used was the density functional theory with the generalized gradient approximation and including Grimme's empirical model in order to properly describe the weak interactions that may occur between the adsorbate and the surface. We found that the adsorption at sites exhibiting two adjacent unsaturated zirconium atoms led to either the exothermic dissociation of CO₂ or to a strongly physisorbed state. By contrast, on a single unsaturated zirconium, CO₂ was adsorbed in an apical manner. In this case, the molecule is highly polarized and the adsorption energy amounts to -64.6 kJ mol⁻¹. Finally, the weakest adsorption of CO₂ occurred on the basic OH sites on the surface.
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Affiliation(s)
- Pascal Boulet
- Laboratoire Matériaux Divisés Interfaces Réactivité Electrochimie, UMR 7246, Aix-Marseille Université et CNRS, Avenue de l'Escadrille Normandie-Niemen, 13397, Marseille Cedex, France.
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15
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A sensitive diagnostic assay of rheumatoid arthritis using three-dimensional ZnO nanorod structure. Biosens Bioelectron 2011; 28:378-85. [DOI: 10.1016/j.bios.2011.07.052] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/18/2011] [Accepted: 07/21/2011] [Indexed: 11/20/2022]
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16
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Kaewruksa B, Ruangpornvisuti V. First principles investigation of oxygen adsorptions on hydrogen–terminated ZnO graphene-like nanosheets. J Mol Model 2011; 18:1447-54. [DOI: 10.1007/s00894-011-1168-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Accepted: 06/27/2011] [Indexed: 10/18/2022]
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17
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Theoretical study on the adsorption behaviors of H2O and NH3 on hydrogen-terminated ZnO nanoclusters and ZnO graphene-like nanosheets. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.03.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Abstract
High-density ZnO nanorods of 60-80 nm in diameter and 500-700 nm in length grown on the silver-coated tip of a borosilicate glass capillary (0.7 mum in diameter) demonstrate a remarkable linear response to proton H(3)O(+) concentrations in solution. These nanorods were used to create a highly sensitive pH sensor for monitoring in vivo biological process within single cells. The ZnO nanorods exhibit a pH-dependent electrochemical potential difference versus an Ag/AgCl microelectrode. The potential difference was linear over a large dynamic range (pH, 4-11) and had a sensitivity equal to 51.88 mV/pH at 22 degrees C, which could be understood in terms of changes in surface charge during protonation and deprotonation. Vertically grown nanoelectrodes of this type can be smoothly and gently applied to penetrate a single living cell without causing cell apoptosis.
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19
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Aranda DAG, Gonçalves JDA, Peres JS, Ramos ALD, de Melo CAR, Antunes OAC, Furtado NC, Taft CA. The use of acids, niobium oxide, and zeolite catalysts for esterification reactions. J PHYS ORG CHEM 2009. [DOI: 10.1002/poc.1520] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Moreira NH, Dolgonos G, Aradi B, da Rosa AL, Frauenheim T. Toward an Accurate Density-Functional Tight-Binding Description of Zinc-Containing Compounds. J Chem Theory Comput 2009; 5:605-14. [DOI: 10.1021/ct800455a] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ney H. Moreira
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, 28359 Bremen, Germany
| | - Grygoriy Dolgonos
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, 28359 Bremen, Germany
| | - Bálint Aradi
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, 28359 Bremen, Germany
| | - Andreia L. da Rosa
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, 28359 Bremen, Germany
| | - Thomas Frauenheim
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, 28359 Bremen, Germany
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Willander M, Klason P, Yang LL, Al-Hilli SM, Zhao QX, Nur O. ZnO nanowires: chemical growth, electrodeposition, and application to intracellular nano-sensors. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pssc.200779232] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Meyer B, Rabaa H, Marx D. Water adsorption on ZnO(101̄0): from single molecules to partially dissociated monolayers. Phys Chem Chem Phys 2006; 8:1513-20. [PMID: 16633635 DOI: 10.1039/b515604a] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Static and dynamic density functional calculations have been used to study the structure and energetics of water adsorbed on the main cleavage plane of ZnO. In the single molecule limit we find that molecular adsorption is strongly preferred. The water binding energy increases for higher coverages due to an almost isotropic attractive water-water interaction which leads to clustering and formation of monolayer islands in the low water coverage regime. A thermodynamic analysis further shows that the full water monolayer is clearly the most stable phase until water starts to desorb. The water monolayer is even more stabilized by a partial dissociation of the water molecules, yielding as most stable configuration a (2x1) superstructure where every second water molecule is cleaved. The dissociation barrier for this process is very small which allows for an auto-dissociation of the water molecules even at low temperatures as observed experimentally. Finally we find that the energy cost involved to form [1210]-oriented domain boundaries between (2x1) patches with different orientation is almost negligible which explains the abundance of such domain boundaries in STM images.
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Affiliation(s)
- Bernd Meyer
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780, Bochum, Germany
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Yang J, Shih YR, Chen IC, Kuo CI, Huang YS. Characterization of infrared chemical sensors modified with ZnO nanowires for the detection of volatile organic compounds. APPLIED SPECTROSCOPY 2005; 59:1002-8. [PMID: 16105208 DOI: 10.1366/0003702054615205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
In this paper we describe the application and characterization of zinc oxide (ZnO) nanowires in an infrared (IR) chemical sensing system for the detection of volatile organic compounds (VOCs). Under suitable conditions, we grew ZnO nanowires on the surfaces of IR internal reflection elements (IREs) and obtained successful results for the detection of VOCs. ZnO nanowires offer a large surface area to effectively adsorb the examined species; the sensitivity of these IR sensing systems was increased by 3- to 15-fold after surface treatment with the ZnO nanowires. To explore the performance of this type of sensor, we correlated the morphologies of the ZnO nanowires grown on the surfaces of the IREs with the adsorption behavior observed during the sensing of the VOCs. To characterize the properties of the ZnO nanowires during the detection of VOCs having a range of functionalities, we classified the VOCs and examined their enrichment factors by comparing the IR signals detected in the presence and absence of the ZnO nanowires. Our results indicate that the ZnO nanowires exhibited better performance for the detection of aromatic-type VOCs than they did for non-aromatic compounds. For quantitative analyses, we examined several compounds for their responses toward varying quantities of injected VOCs. Our results indicate that the IREs treated with ZnO nanowires display acceptable linearity in their standard curves; the linear regression coefficients were higher than 0.995 for a range of volatile compounds.
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Affiliation(s)
- Jyisy Yang
- Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan.
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24
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Charges derived from electrostatic potentials: Exploring dependence on theory and geometry optimization levels for dipole moments. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.04.075] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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