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Turchi M, Galmarini S, Lunati I. Learning Adsorption Patterns on Amorphous Surfaces. J Chem Theory Comput 2024. [PMID: 39186282 DOI: 10.1021/acs.jctc.4c00702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
The physicochemical heterogeneity found on amorphous surfaces leads to a complex interaction of adsorbate molecules with topological and undercoordinated defects, which enhance the adsorption capacity and can participate in catalytic reactions. The identification and analysis of the adsorption structure observed on amorphous surfaces require novel tools that allow the segmentation of the surfaces into complex-shaped regions that contrast with the periodic patterns found on crystalline surfaces. We propose a Random Forest (RF) classifier that segments the surface into regions that can then be further analyzed and classified to reveal the dynamics of the interaction with the adsorbate. The RF segmentation is applied to the surface density map of the adsorbed molecules and employs multiple features (intensity, gradient, and the eigenvalues of the Hessian matrix) which are nonlocal and allow a better identification of the adsorption structures. The segmentation depends on a set of parameters that specify the training set and can be tailored to serve the specific purpose of the segmentation. Here, we consider an example in which we aim to separate highly heterogeneous regions from weakly heterogeneous regions. We demonstrate that the RF segmentation is able to separate the surface into a fully connected weakly heterogeneous region (whose behavior is somehow similar to crystalline surfaces and has an exponential distribution of the residence time) and a very heterogeneous region characterized by a complex residence-time distribution, which is generated by the undercoordinated defects and is responsible for the peculiar characteristics of the amorphous surface.
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Affiliation(s)
- Mattia Turchi
- Laboratory for Computational Engineering, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Sandra Galmarini
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Ivan Lunati
- Laboratory for Computational Engineering, Swiss Federal Laboratories for Materials Science and Technology, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland
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Fatti G, Kim H, Sohn C, Park M, Lim YW, Li Z, Park KI, Szlufarska I, Ko H, Jeong CK, Cho SB. Uncertainty and Irreproducibility of Triboelectricity Based on Interface Mechanochemistry. PHYSICAL REVIEW LETTERS 2023; 131:166201. [PMID: 37925700 DOI: 10.1103/physrevlett.131.166201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 05/22/2023] [Accepted: 09/15/2023] [Indexed: 11/07/2023]
Abstract
Triboelectrification mechanism is still not understood, despite centuries of investigations. Here, we propose a model showing that mechanochemistry is key to elucidate triboelectrification fundamental properties. Studying contact between gold and silicate glasses, we observe that the experimental triboelectric output is subject to large variations and polarity inversions. First principles analysis shows that electronic transfer is activated by mechanochemistry and the tribopolarity is determined by the termination exposed to contact, depending on the material composition, which can result in different charging at the macroscale. The electron transfer mechanism is driven by the interface barrier dynamics, regulated by mechanical forces. The model provides a unified framework to explain several experimental observations, including the systematic variations in the triboelectric output and the mixed positive-negative "mosaic" charging patterns, and paves the way to the theoretical prediction of the triboelectric properties.
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Affiliation(s)
- Giulio Fatti
- Center of Materials Digitalization, Korea Institute of Ceramic Engineering and Technology (KICET), Jinju, Gyeongsangnam-do 52851, Republic of Korea
| | - Hyunseung Kim
- Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
- Department of Energy Storage/Conversion Engineering of Graduate School and Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Changwan Sohn
- Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
- Department of Energy Storage/Conversion Engineering of Graduate School and Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Minah Park
- Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Yeong-Won Lim
- Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
- Department of Energy Storage/Conversion Engineering of Graduate School and Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Zhuohan Li
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Kwi-Il Park
- School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Izabela Szlufarska
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706-1595, USA
| | - Hyunseok Ko
- Center of Materials Digitalization, Korea Institute of Ceramic Engineering and Technology (KICET), Jinju, Gyeongsangnam-do 52851, Republic of Korea
| | - Chang Kyu Jeong
- Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
- Department of Energy Storage/Conversion Engineering of Graduate School and Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
- Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Sung Beom Cho
- Department of Materials Science and Engineering, Ajou University, Suwon, Gyeonggi-do 16499, Republic of Korea
- Department of Energy Systems Research, Ajou University, Suwon, Gyeonggi-do 16499, Republic of Korea
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Cottom J, Bochkarev A, Olsson E, Patel K, Munde M, Spitaler J, Popov MN, Bosman M, Shluger AL. Modeling of Diffusion and Incorporation of Interstitial Oxygen Ions at the TiN/SiO 2 Interface. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36232-36243. [PMID: 31532611 DOI: 10.1021/acsami.9b10705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Silica-based resistive random access memory devices have become an active research area due to complementary metal-oxide-semiconductor compatibility and recent dramatic increases in their performance and endurance. In spite of both experimental and theoretical insights gained into the electroforming process, many atomistic aspects of the set and reset operation of these devices are still poorly understood. Recently a mechanism of electroforming process based on the formation of neutral oxygen vacancies (VO0) and interstitial O ions (Oi2-) facilitated by electron injection into the oxide has been proposed. In this work, we extend the description of the bulk (Oi2-) migration to the interface of amorphous SiO2 with the polycrystaline TiN electrode, using density functional theory simulations. The results demonstrate a strong kinetic and thermodynamic drive for the movement of Oi2- to the interface, with dramatically reduced incorporation energies and migration barriers close to the interface. The arrival of Oi2- at the interface is accompanied by preferential oxidation of undercoordinated Ti sites at the interface, forming a Ti-O layer. We investigate how O ions incorporate into a perfect and defective ∑5(012)[100] grain boundary (GB) in TiN oriented perpendicular to the interface. Our simulations demonstrate the preferential incorporation of Oi at defects within the TiN GB and their fast diffusion along a passivated grain boundary. They explain how, as a result of electroforming, the system undergoes very significant structural changes with the oxide being significantly reduced, interface being oxidized, and part of the oxygen leaving the system.
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Affiliation(s)
| | - Anton Bochkarev
- LITEN, CEA-Grenoble , 17 rue des Martyrs , 38054 Grenoble Cedex 9, France
| | | | - Kamal Patel
- Institute of Materials Research and Engineering , Agency for Science, Technology and Research (A*STAR) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| | - Manveer Munde
- Institute of Materials Research and Engineering , Agency for Science, Technology and Research (A*STAR) , 2 Fusionopolis Way , Singapore 138634 , Singapore
| | - Jürgen Spitaler
- Materials Center Leoben Forschung GmbH (MCL) , Roseggerstraße 12 , A-8700 Leoben , Austria
| | - Maxim N Popov
- Materials Center Leoben Forschung GmbH (MCL) , Roseggerstraße 12 , A-8700 Leoben , Austria
| | - Michel Bosman
- Institute of Materials Research and Engineering , Agency for Science, Technology and Research (A*STAR) , 2 Fusionopolis Way , Singapore 138634 , Singapore
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Active sites formation and their transformations during ethylene polymerization by the Phillips CrOx/SiO2 catalyst. J Catal 2017. [DOI: 10.1016/j.jcat.2017.05.025] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Schlexer P, Pacchioni G. Adsorption and Dimerization of Late Transition Metal Atoms on the Regular and Defective Quartz (001) Surface. Top Catal 2016. [DOI: 10.1007/s11244-016-0712-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ramo DM, Bristowe PD. The effect of defects and disorder on the electronic properties of ZnIr2O4. J Chem Phys 2014; 141:084704. [DOI: 10.1063/1.4893556] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- David Muñoz Ramo
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Paul D. Bristowe
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
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Berardo E, Hu HS, Shevlin SA, Woodley S, Kowalski K, Zwijnenburg MA. Modeling Excited States in TiO 2 Nanoparticles: On the Accuracy of a TD-DFT Based Description. J Chem Theory Comput 2014; 10:1189-1199. [PMID: 24795544 PMCID: PMC4006391 DOI: 10.1021/ct4010273] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Indexed: 12/30/2022]
Abstract
We have investigated the suitability of Time-Dependent Density Functional Theory (TD-DFT) to describe vertical low-energy excitations in naked and hydrated titanium dioxide nanoparticles. Specifically, we compared TD-DFT results obtained using different exchange-correlation (XC) potentials with those calculated using Equation-of-Motion Coupled Cluster (EOM-CC) quantum chemistry methods. We demonstrate that TD-DFT calculations with commonly used XC potentials (e.g., B3LYP) and EOM-CC methods give qualitatively similar results for most TiO2 nanoparticles investigated. More importantly, however, we also show that, for a significant subset of structures, TD-DFT gives qualitatively different results depending upon the XC potential used and that only TD-CAM-B3LYP and TD-BHLYP calculations yield results that are consistent with those obtained using EOM-CC theory. Moreover, we demonstrate that the discrepancies for such structures originate from a particular combination of defects that give rise to charge-transfer excitations, which are poorly described by XC potentials that do not contain sufficient Hartree-Fock like exchange. Finally, we consider that such defects are readily healed in the presence of ubiquitously present water and that, as a result, the description of vertical low-energy excitations for hydrated TiO2 nanoparticles is nonproblematic.
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Affiliation(s)
- Enrico Berardo
- Department
of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, United Kingdom
| | - Han-Shi Hu
- William
R. Wiley Environmental Molecular Science Laboratory, Battelle, Pacific Northwest National Laboratory, K8-91, P.O. Box
999, Richland, Washington 99352, United States
| | - Stephen A. Shevlin
- Department
of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, United Kingdom
| | - Scott
M. Woodley
- Department
of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, United Kingdom
| | - Karol Kowalski
- William
R. Wiley Environmental Molecular Science Laboratory, Battelle, Pacific Northwest National Laboratory, K8-91, P.O. Box
999, Richland, Washington 99352, United States
| | - Martijn A. Zwijnenburg
- Department
of Chemistry, University College London, 20 Gordon Street, WC1H 0AJ, London, United Kingdom
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Rimola A, Costa D, Sodupe M, Lambert JF, Ugliengo P. Silica surface features and their role in the adsorption of biomolecules: computational modeling and experiments. Chem Rev 2013; 113:4216-313. [PMID: 23289428 DOI: 10.1021/cr3003054] [Citation(s) in RCA: 328] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Albert Rimola
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra (Cerdanyola del Vallès), Spain
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Sousa C, Tosoni S, Illas F. Theoretical Approaches to Excited-State-Related Phenomena in Oxide Surfaces. Chem Rev 2012. [DOI: 10.1021/cr300228z] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Carmen Sousa
- Departament de Química
Física and Institut de Química Teòrica i Computacional
(IQTCUB), Universitat de Barcelona, C/Martí
i Franquès 1, 08028 Barcelona, Spain
| | - Sergio Tosoni
- Departament de Química
Física and Institut de Química Teòrica i Computacional
(IQTCUB), Universitat de Barcelona, C/Martí
i Franquès 1, 08028 Barcelona, Spain
- Departamento de Química, Universidad de Las Palmas de Gran Canaria, Campus Universitario
de Tafira, 35017 Las Palmas de Gran Canaria, Spain
| | - Francesc Illas
- Departament de Química
Física and Institut de Química Teòrica i Computacional
(IQTCUB), Universitat de Barcelona, C/Martí
i Franquès 1, 08028 Barcelona, Spain
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Abstract
The photo darkening (PD) absorption spectra from unseeded amplifier operation (by 915 nm pumping) of ytterbium / aluminum and co-doped silica fibers is after prolonged operation observed to develop a characteristic line at 2.6 eV (477 nm). This line is proposed to be due to inter center excitation transfer from type II oxygen deficiency centers ODC(II) to Tm3+ trace impurities. The ODC(II) is proposed to be the result of a displacive transition of a 4-fold silica ring hosting two 3-fold silicon units that presents two non-bridging oxygen to Yb3+ (as part of its 6-fold coordination by oxygen). The displacive transition is initiated by a charge disproportionation process which leads to NBO transfer in forming dioxasilirane (2-fold coordinated silicon with two NBO attached) next to silylene (2-fold coordinated silicon with a lone electron pair). In collaboration with a valence electron of Yb3+ a new ½ / 1½ chemical bond is formed on dioxasilirane which comprises the PD color center for the visible and near-infrared. Difference in solid acidity of the silica material co-doped with Yb/Al and Yb/P may explain the observed difference in spectral shapes by change of bond order to the formed chemical bond.
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Affiliation(s)
- Peter V. Sushko
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom, WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, and Department of Physics, St. Petersburg State University, St. Petersburg 198504, Russia
| | - Igor V. Abarenkov
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom, WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, and Department of Physics, St. Petersburg State University, St. Petersburg 198504, Russia
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12
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Electron traps and their effect on the surface chemistry of TiO2(110). Proc Natl Acad Sci U S A 2010; 107:2391-6. [PMID: 20133773 DOI: 10.1073/pnas.0911349107] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oxygen vacancies on metal oxide surfaces have long been thought to play a key role in the surface chemistry. Such processes have been directly visualized in the case of the model photocatalyst surface TiO(2)(110) in reactions with water and molecular oxygen. These vacancies have been assumed to be neutral in calculations of the surface properties. However, by comparing experimental and simulated scanning tunneling microscopy images and spectra, we show that oxygen vacancies act as trapping centers and are negatively charged. We demonstrate that charging the defect significantly affects the reactivity by following the reaction of molecular oxygen with surface hydroxyl formed by water dissociation at the vacancies. Calculations with electronically charged hydroxyl favor a condensation reaction forming water and surface oxygen adatoms, in line with experimental observations. This contrasts with simulations using neutral hydroxyl where hydrogen peroxide is found to be the most stable product.
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Kauffman DR, Shade CM, Uh H, Petoud S, Star A. Decorated carbon nanotubes with unique oxygen sensitivity. Nat Chem 2009; 1:500-6. [DOI: 10.1038/nchem.323] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Accepted: 07/07/2009] [Indexed: 12/28/2022]
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Zwijnenburg MA, Sokol AA, Sousa C, Bromley ST. The effect of local environment on photoluminescence: A time-dependent density functional theory study of silanone groups on the surface of silica nanostructures. J Chem Phys 2009; 131:034705. [DOI: 10.1063/1.3155083] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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Johnson JP, Zheng N, Williams CC. Atomic scale imaging and spectroscopy of individual electron trap states using force detected dynamic tunnelling. NANOTECHNOLOGY 2009; 20:055701. [PMID: 19417360 DOI: 10.1088/0957-4484/20/5/055701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the first atomic scale imaging and spectroscopic measurements of electron trap states in completely non-conducting surfaces by dynamic tunnelling force microscopy/spectroscopy. Single electrons are dynamically shuttled to/from individual states in thick films of hafnium silicate and silicon dioxide. The new method opens up surfaces that are inaccessible to the scanning tunnelling microscope for imaging and spectroscopy on an atomic scale.
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Affiliation(s)
- J P Johnson
- Department of Physics, University of Utah, Salt Lake City, UT 84112, USA
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Messina F, Cannas M, Boscaino R. Generation of defects in amorphous SiO(2) assisted by two-step absorption on impurity sites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275210. [PMID: 21694371 DOI: 10.1088/0953-8984/20/27/275210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Generation of the Si dangling bond defect in amorphous SiO(2) (E' centre) induced by tunable pulsed UV laser radiation was investigated by in situ optical absorption measurements. The defect generation efficiency peaks when the photon energy equals ∼5.1 eV, it depends quadratically on laser intensity and is correlated with the native linear absorption due to Ge impurities. We propose a model in which the generation of E' is assisted by a two-step absorption process occurring on Ge impurity sites.
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Affiliation(s)
- F Messina
- Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Via Archirafi 36, I-90123 Palermo, Italy
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Zwijnenburg MA, Sousa C, Sokol AA, Bromley ST. Optical excitations of defects in realistic nanoscale silica clusters: Comparing the performance of density functional theory using hybrid functionals with correlated wavefunction methods. J Chem Phys 2008; 129:014706. [DOI: 10.1063/1.2943147] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Hamad S, Bromley ST. Low reactivity of non-bridging oxygen defects on stoichiometric silica surfaces. Chem Commun (Camb) 2008:4156-8. [DOI: 10.1039/b807291d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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