151
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Tittl A, Yin X, Giessen H, Tian XD, Tian ZQ, Kremers C, Chigrin DN, Liu N. Plasmonic smart dust for probing local chemical reactions. NANO LETTERS 2013; 13:1816-21. [PMID: 23458121 DOI: 10.1021/nl4005089] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Locally probing chemical reactions or catalytic processes on surfaces under realistic reaction conditions has remained one of the main challenges in materials science and heterogeneous catalysis. Where conventional surface interrogation techniques usually require high-vacuum conditions or ensemble average measurements, plasmonic nanoparticles excel in extreme light focusing and can produce highly confined electromagnetic fields in subwavelength volumes without the need for complex near-field microscopes. Here, we demonstrate an all-optical probing technique based on plasmonic smart dust for monitoring local chemical reactions in real time. The silica shell-isolated gold nanoparticles that form the smart dust can work as strong light concentrators and optically report subtle environmental changes at their pinning sites on the probed surface during reaction processes. As a model system, we investigate the hydrogen dissociation and subsequent uptake trajectory in palladium with both "dust-on-film" and "film-on-dust" platforms. Using time-resolved single particle measurements, we demonstrate that our technique can in situ encode chemical reaction information as optical signals for a variety of surface morphologies. The presented technique offers a unique scheme for real-time, label-free, and high-resolution probing of local reaction kinetics in a plethora of important chemical reactions on surfaces, paving the way toward the development of inexpensive and high-output reaction sensors for real-world applications.
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Affiliation(s)
- Andreas Tittl
- 4h Physics Institute and Research Center Scope, University of Stuttgart, Stuttgart, Germany
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152
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Wang F, Li C, Chen H, Jiang R, Sun LD, Li Q, Wang J, Yu JC, Yan CH. Plasmonic Harvesting of Light Energy for Suzuki Coupling Reactions. J Am Chem Soc 2013; 135:5588-601. [DOI: 10.1021/ja310501y] [Citation(s) in RCA: 517] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Feng Wang
- State Key Lab of Rare Earth
Materials Chemistry and Applications, Peking University, Beijing 100871, China
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Chuanhao Li
- Department of
Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
- School of Chemistry
and Chemical
Engineering, Anhui University, Hefei 230039,
Anhui, China
| | - Huanjun Chen
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Ruibin Jiang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Ling-Dong Sun
- State Key Lab of Rare Earth
Materials Chemistry and Applications, Peking University, Beijing 100871, China
| | - Quan Li
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Jianfang Wang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Jimmy C. Yu
- Department of
Chemistry, The Chinese University of Hong Kong, Shatin, Hong Kong
SAR, China
| | - Chun-Hua Yan
- State Key Lab of Rare Earth
Materials Chemistry and Applications, Peking University, Beijing 100871, China
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153
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Marimuthu A, Zhang J, Linic S. Tuning Selectivity in Propylene Epoxidation by Plasmon Mediated Photo-Switching of Cu Oxidation State. Science 2013; 339:1590-3. [DOI: 10.1126/science.1231631] [Citation(s) in RCA: 470] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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154
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Subramanian R, Subbramaniyan P, Raj V. Antioxidant activity of the stem bark of Shorea roxburghii and its silver reducing power. SPRINGERPLUS 2013; 2:28. [PMID: 23519327 PMCID: PMC3601264 DOI: 10.1186/2193-1801-2-28] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 01/20/2013] [Indexed: 12/31/2022]
Abstract
A detailed study has been performed on the antioxidant activity of the acetone and methanol extracts of the stem bark of the plant, Shorea roxburghii. The total phenolic content and antioxidant activity of the extracts were determined by DPPH, radical scavenging, ferric ion reducing power, hydroxyl radical, ABTS. radical scavenging and hydrogen peroxide scavenging activities. Reducing efficiency of the S. roxburghii towards silver nanoparticles has been evaluated using surface plasmon resonance and transmission electron microscope. Spherical shapes of particles with 4–50 nm have been reported. Formation of silver nanoparticles ascertains the role of the water soluble phenolic compounds present in S. roxburghii. Both acetone and methanol extracts of S. roxburghii stem bark was found to be a potent antioxidant. This work provides a scientific support for the high antioxidant activity of this plant and thus it may find potential applications in the treatment of the diseases caused by free radical. The extract of this plant could be used as a green reducing agent for the synthesis of Ag nanoparticles.
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Affiliation(s)
- Ramasamy Subramanian
- Advanced Materials Research Laboratory, Department of Chemistry, Periyar University, Salem, 636011 Tamil Nadu India
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155
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Mai NT, Thuy TT, Mott DM, Maenosono S. Chemical synthesis of blue-emitting metallic zinc nano-hexagons. CrystEngComm 2013. [DOI: 10.1039/c3ce40801a] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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156
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Birol H, Renato Rambo C, Guiotoku M, Hotza D. Preparation of ceramic nanoparticlesvia cellulose-assisted glycine nitrate process: a review. RSC Adv 2013. [DOI: 10.1039/c2ra21810k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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157
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Liu B, Wang J, Sun S, Wang X, Zhao M, Zhang W, Zhang H, Yang X. A general method for the synthesis of various rattle-type microspheres and their diverse applications. RSC Adv 2013. [DOI: 10.1039/c3ra42997k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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158
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Willets KA. Super-resolution imaging of interactions between molecules and plasmonic nanostructures. Phys Chem Chem Phys 2013; 15:5345-54. [DOI: 10.1039/c3cp43882a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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159
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Babu J, George J, Varma RL. Metal-induced fluorescence lifetime enhancement of quinaldine chromophore on gold nanoparticle surface. NEW J CHEM 2013. [DOI: 10.1039/c3nj00287j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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160
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Christopher P, Xin H, Marimuthu A, Linic S. Singular characteristics and unique chemical bond activation mechanisms of photocatalytic reactions on plasmonic nanostructures. NATURE MATERIALS 2012. [PMID: 23178296 DOI: 10.1038/nmat3454] [Citation(s) in RCA: 407] [Impact Index Per Article: 33.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The field of heterogeneous photocatalysis has almost exclusively focused on semiconductor photocatalysts. Herein, we show that plasmonic metallic nanostructures represent a new family of photocatalysts. We demonstrate that these photocatalysts exhibit fundamentally different behaviour compared with semiconductors. First, we show that photocatalytic reaction rates on excited plasmonic metallic nanostructures exhibit a super-linear power law dependence on light intensity (rate ∝ intensity(n), with n > 1), at significantly lower intensity than required for super-linear behaviour on extended metal surfaces. We also demonstrate that, in sharp contrast to semiconductor photocatalysts, photocatalytic quantum efficiencies on plasmonic metallic nanostructures increase with light intensity and operating temperature. These unique characteristics of plasmonic metallic nanostructures suggest that this new family of photocatalysts could prove useful for many heterogeneous catalytic processes that cannot be activated using conventional thermal processes on metals or photocatalytic processes on semiconductors.
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Affiliation(s)
- Phillip Christopher
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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161
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Roth PJ, Theato P. Covalent Attachment of Gold Nanoparticles to Surfaces and Polymeric Substrates Using UV Light. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200485] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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162
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Albooyeh M, Simovski CR. Huge local field enhancement in perfect plasmonic absorbers. OPTICS EXPRESS 2012; 20:21888-21895. [PMID: 23037338 DOI: 10.1364/oe.20.021888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this work we theoretically reveal the huge local field enhancement in a so-called perfect plasmonic absorber. We study the power absorption of light in a planar grid modelled as an effective sheet with zero optical thickness. The key prerequisite of the total absorption is the simultaneous presence of both resonant electric and magnetic modes in the structure. We show that the needed level of the magnetic mode is achievable using the effect of substrate-induced bianisotropy. On the microscopic level this bianisotropy is a factor which results in the huge local field enhancement at the same wavelength where the maximal absorption holds.
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Affiliation(s)
- M Albooyeh
- Department of Radio Science and Engineering / SMARAD Centre of Excellence, Aalto University, PO Box 13000, FI-00076 Aalto, Finland.
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163
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Menzel D. Electronically induced surface reactions: Evolution, concepts, and perspectives. J Chem Phys 2012; 137:091702. [DOI: 10.1063/1.4746799] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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164
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Wu J, Zhang F, Zhang H. Facile synthesis of carboxymethyl curdlan-capped silver nanoparticles and their application in SERS. Carbohydr Polym 2012; 90:261-9. [DOI: 10.1016/j.carbpol.2012.05.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 04/02/2012] [Accepted: 05/01/2012] [Indexed: 10/28/2022]
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165
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Kirkeminde A, Retsch M, Wang Q, Xu G, Hui R, Wu J, Ren S. Surface-passivated plasmonic nano-pyramids for bulk heterojunction solar cell photocurrent enhancement. NANOSCALE 2012; 4:4421-5. [PMID: 22695531 DOI: 10.1039/c2nr30735a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We report that self-assembled gold (Au) nanopyramid arrays can greatly enhance the photocurrent of narrow bandgap organic solar cells using their plasmonic near-field effect. The plasmonic enhanced power conversion efficiency exhibited up to 200% increase under the AM 1.5 solar illumination.
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Affiliation(s)
- Alec Kirkeminde
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA
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166
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Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM. APPLIED SCIENCES-BASEL 2012. [DOI: 10.3390/app2030566] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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167
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Zhang J, Fu Y, Li G, Zhao RY. Metal plasmon-coupled fluorescence imaging and label free coenzyme detection in cells. Biochem Biophys Res Commun 2012; 425:696-700. [PMID: 22713456 DOI: 10.1016/j.bbrc.2012.06.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Accepted: 06/12/2012] [Indexed: 11/17/2022]
Abstract
Flavin adenine dinucleotide (FAD) is a key metabolite in cellular energy conversion. Flavin can also bind with some enzymes in the metabolic pathway and the binding sites may be changed due to the disease progression. Thus, there is interest on studying its expression level, distribution, and redox state within the cells. FAD is naturally fluorescent, but it has a modest extinction coefficient and quantum yield. Hence the intrinsic emission from FAD is generally too weak to be isolated distinctly from the cellular backgrounds in fluorescence cell imaging. In this article, the metal nanostructures on the glass coverslips were used as substrates to measure FAD in cells. Particulate silver films were fabricated with an optical resonance near the absorption and the emission wavelengths of FAD which can lead to efficient coupling interactions. As a result, the emission intensity and quantum yield by FAD were greatly increased and the lifetime was dramatically shortened resulting in less interference from the longer lived cellular background. This feature may overcome the technical limits that hinder the direct observation of intrinsically fluorescent coenzymes in the cells by fluorescence microscopy. Fluorescence cell imaging on the metallic particle substrates may provide a non-invasive strategy for collecting the information of coenzymes in cells.
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Affiliation(s)
- Jian Zhang
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201, USA.
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168
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Jiang J, Li H, Zhang L. New Insight into Daylight Photocatalysis of AgBr@Ag: Synergistic Effect between Semiconductor Photocatalysis and Plasmonic Photocatalysis. Chemistry 2012; 18:6360-9. [DOI: 10.1002/chem.201102606] [Citation(s) in RCA: 221] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 02/12/2012] [Indexed: 11/08/2022]
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169
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Zhdanov VP, Kasemo B. Photo-induced chemical processes on metal–semiconductor–metal nanostructures. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.12.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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170
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Zhang H, Huang X, Li L, Zhang G, Hussain I, Li Z, Tan B. Photoreductive synthesis of water-soluble fluorescent metal nanoclusters. Chem Commun (Camb) 2012; 48:567-9. [DOI: 10.1039/c1cc16088e] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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171
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Zhou X, Liu G, Yu J, Fan W. Surface plasmon resonance-mediated photocatalysis by noble metal-based composites under visible light. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31902k] [Citation(s) in RCA: 418] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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172
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Kumar Petla R, Vivekanandhan S, Misra M, Kumar Mohanty A, Satyanarayana N. Soybean (<i>Glycine Max</i>) Leaf Extract Based Green Synthesis of Palladium Nanoparticles. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/jbnb.2012.31003] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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173
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Wang P, Huang B, Dai Y, Whangbo MH. Plasmonic photocatalysts: harvesting visible light with noble metal nanoparticles. Phys Chem Chem Phys 2012; 14:9813-25. [DOI: 10.1039/c2cp40823f] [Citation(s) in RCA: 671] [Impact Index Per Article: 55.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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174
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García Rey N, Arnolds H. Hot hole-induced dissociation of NO dimers on a copper surface. J Chem Phys 2011; 135:224708. [DOI: 10.1063/1.3664861] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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175
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Linic S, Christopher P, Ingram DB. Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy. NATURE MATERIALS 2011; 10:911-21. [PMID: 22109608 DOI: 10.1038/nmat3151] [Citation(s) in RCA: 2092] [Impact Index Per Article: 160.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Recent years have seen a renewed interest in the harvesting and conversion of solar energy. Among various technologies, the direct conversion of solar to chemical energy using photocatalysts has received significant attention. Although heterogeneous photocatalysts are almost exclusively semiconductors, it has been demonstrated recently that plasmonic nanostructures of noble metals (mainly silver and gold) also show significant promise. Here we review recent progress in using plasmonic metallic nanostructures in the field of photocatalysis. We focus on plasmon-enhanced water splitting on composite photocatalysts containing semiconductor and plasmonic-metal building blocks, and recently reported plasmon-mediated photocatalytic reactions on plasmonic nanostructures of noble metals. We also discuss the areas where major advancements are needed to move the field of plasmon-mediated photocatalysis forward.
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Affiliation(s)
- Suljo Linic
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
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176
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Chen X, Li P, Tong H, Kako T, Ye J. Nanoarchitectonics of a Au nanoprism array on WO 3 film for synergistic optoelectronic response. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2011; 12:044604. [PMID: 27877412 PMCID: PMC5090490 DOI: 10.1088/1468-6996/12/4/044604] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 07/07/2011] [Accepted: 04/15/2011] [Indexed: 06/03/2023]
Abstract
A layered photoelectrode consisting of a conductive indium tin oxide substrate, a WO3 nanocrystalline film and an array of Au nanoprisms was fabricated via a multistep process. Scanning electron microscopy and atomic force microscopy showed that the Au nanoprisms had a uniform size and shape and formed periodic hexagonal patterns on the WO3 film. The optical absorption of the photoelectrode combined the intrinsic absorption of WO3 and plasmonic absorption of Au. Using this photoelectrode, we investigated the effect of the Au nanoprism array on the optoelectronic conversion performance of the WO3 film. Photoelectrochemical measurement indicated that the array substantially enhanced the photocurrent in the WO3 film. Electrochemical impedance measurements revealed that the Schottky junctions formed between Au and WO3 can facilitate the separation of photogenerated carriers as well as the interfacial carrier transfer. In this study, we demonstrate that covering a semiconductor with plasmonic noble metal nanoparticles can improve its optoelectronic conversion efficiency.
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Affiliation(s)
- Xiaoqing Chen
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
- Photocatalytic Materials Center, National Institute for Materials Scienc (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Peng Li
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
- Photocatalytic Materials Center, National Institute for Materials Scienc (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Hua Tong
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Photocatalytic Materials Center, National Institute for Materials Scienc (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Tetsuya Kako
- Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
- Photocatalytic Materials Center, National Institute for Materials Scienc (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Jinhua Ye
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
- Photocatalytic Materials Center, National Institute for Materials Scienc (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
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177
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Kim KH, Watanabe K, Mulugeta D, Freund HJ, Menzel D. Enhanced photoinduced desorption from metal nanoparticles by photoexcitation of confined hot electrons using femtosecond laser pulses. PHYSICAL REVIEW LETTERS 2011; 107:047401. [PMID: 21867042 DOI: 10.1103/physrevlett.107.047401] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Indexed: 05/31/2023]
Abstract
Strong fluence dependence of photodesorption cross sections is observed in femtosecond laser photodesorption of NO from (NO)2 on silver nanoparticles, in contrast to femtosecond photodesorption on bulk metals. The time scale of excitation buildup is found to be equal or less than the pulse duration of ∼100 fs; NO translational energies are independent of fluence and pulse duration. We propose a nanoparticle-specific nonlinear mechanism in which, due to confinement, strongly nonthermal hot-electron distributions are maintained during the femtosecond pulses, enhancing the normal desorption pathway.
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Affiliation(s)
- Ki Hyun Kim
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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178
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Munechika K, Chen Y, Tillack AF, Kulkarni AP, Jen-La Plante I, Munro AM, Ginger DS. Quantum dot/plasmonic nanoparticle metachromophores with quantum yields that vary with excitation wavelength. NANO LETTERS 2011; 11:2725-2730. [PMID: 21612262 DOI: 10.1021/nl2010127] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Coupled plasmonic/chromophore systems are of interest in applications ranging from fluorescent biosensors to solar photovoltaics and photoelectrochemical cells because near-field coupling to metal nanostructures can dramatically alter the optical performance of nearby materials. We show that CdSe quantum dots (QDs) near single silver nanoprisms can exhibit photoluminescence lifetimes and quantum yields that depend on the excitation wavelength, in apparent violation of the Kasha-Vavilov rule. We attribute the variation in QD lifetime with excitation wavelength to the wavelength-dependent coupling of higher-order plasmon modes to different spatial subpopulations of nearby QDs. At the QD emission wavelength, these subpopulations are coupled to far-field radiation with varying efficiency by the nanoprism dipolar resonance. These results offer an easily accessible new route to design metachromophores with tailored optical properties.
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Affiliation(s)
- Keiko Munechika
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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179
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Jones MR, Osberg KD, Macfarlane RJ, Langille MR, Mirkin CA. Templated Techniques for the Synthesis and Assembly of Plasmonic Nanostructures. Chem Rev 2011; 111:3736-827. [DOI: 10.1021/cr1004452] [Citation(s) in RCA: 996] [Impact Index Per Article: 76.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Matthew R. Jones
- Department of Materials Science and Engineering, ‡Department of Chemistry, and §International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Kyle D. Osberg
- Department of Materials Science and Engineering, ‡Department of Chemistry, and §International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Robert J. Macfarlane
- Department of Materials Science and Engineering, ‡Department of Chemistry, and §International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Mark R. Langille
- Department of Materials Science and Engineering, ‡Department of Chemistry, and §International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Chad A. Mirkin
- Department of Materials Science and Engineering, ‡Department of Chemistry, and §International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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180
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Abdel-Halim E, El-Rafie M, Al-Deyab SS. Polyacrylamide/guar gum graft copolymer for preparation of silver nanoparticles. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2011.03.039] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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181
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Christopher P, Xin H, Linic S. Visible-light-enhanced catalytic oxidation reactions on plasmonic silver nanostructures. Nat Chem 2011; 3:467-72. [PMID: 21602862 DOI: 10.1038/nchem.1032] [Citation(s) in RCA: 971] [Impact Index Per Article: 74.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 03/18/2011] [Indexed: 11/09/2022]
Abstract
Catalysis plays a critical role in chemical conversion, energy production and pollution mitigation. High activation barriers associated with rate-limiting elementary steps require most commercial heterogeneous catalytic reactions to be run at relatively high temperatures, which compromises energy efficiency and the long-term stability of the catalyst. Here we show that plasmonic nanostructures of silver can concurrently use low-intensity visible light (on the order of solar intensity) and thermal energy to drive catalytic oxidation reactions--such as ethylene epoxidation, CO oxidation, and NH₃ oxidation--at lower temperatures than their conventional counterparts that use only thermal stimulus. Based on kinetic isotope experiments and density functional calculations, we postulate that excited plasmons on the silver surface act to populate O₂ antibonding orbitals and so form a transient negative-ion state, which thereby facilitates the rate-limiting O₂-dissociation reaction. The results could assist the design of catalytic processes that are more energy efficient and robust than current processes.
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Affiliation(s)
- Phillip Christopher
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
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182
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Mulugeta D, Watanabe K, Menzel D, Freund HJ. State-resolved investigation of the photodesorption dynamics of NO from (NO)2 on Ag nanoparticles of various sizes in comparison with Ag(111). J Chem Phys 2011; 134:164702. [DOI: 10.1063/1.3581802] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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183
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Abad JM, Revenga-Parra M, García T, Gamero M, Lorenzo E, Pariente F. Interactions of Schiff-base ligands with gold nanoparticles: structural, optical and electrocatalytic studies. Phys Chem Chem Phys 2011; 13:5668-78. [PMID: 21311788 DOI: 10.1039/c0cp02164d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A study on optical and electrochemical properties resulting upon interaction of Schiff base ligands with gold nanoparticles is presented. The measurements of the optical absorption and fluorescence properties have provided important information about structure-properties dependence. We show that in function of the isomer structure and its attachment orientation with respect to the metal nanoparticle, their optical properties can be modulated. Nanoparticle assemblies mediated by 3,4-DHS were also obtained based on a control of the interparticle interactions and their electrocatalytic activity toward NADH oxidation was investigated.
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Affiliation(s)
- Jose María Abad
- Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain.
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184
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Zhang J, Fu Y, Lakowicz JR. Fluorescent Metal Nanoshells: Lifetime-Tunable Molecular Probes in Fluorescent Cell Imaging. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2011; 115:7255-7260. [PMID: 21743823 PMCID: PMC3130523 DOI: 10.1021/jp111475y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We reported the preparation of lifetime-tunable fluorescent metal nanoshells and used them as lifetime imaging agents for potential detection of multiple target molecules by a single cell imaging scan. These metal nanoshells were generated to have 40 nm silica cores and 10 nm silver shells. Three kinds of metal-ligand complexes tris(5-amino-1,10-phenanthroline)ruthenium(II) (Ru(NH(2)-Phen)(3) (2+)), tris(2,2'-bipyridine) ruthenium(II) (Ru(bpy)(3) (2+)), and tris(2,3-bis(2-pyridyl)pyrazine))ruthenium(II) (Ru(dpp)(3) (2+)) that have similar excitation and emission wavelengths but different lifetimes were respectively encapsulated in the cores of metal nanoshells for the purpose of fluorescence. Compared with the metal-free silica spheres, these metal nanoshells were found to display enhanced emission intensities and shortened lifetimes due to near-field interactions of Ru(II) complexes with the metal shells. The shortened lifetimes of these metal nanoshells were definitely unique relevant to the Ru(II) complexes: 10 ns for the Ru(Phen-NH(2))(3) (2+)-Ag nanoshells, 45 ns for the Ru(bpy)(3) (2+)-Ag nanoshells, and 200 ns for the Ru(dpp)(3) (2+)-Ag nanoshells. These lifetimes were longer than the lifetime of cellular autofluorescence (2 - 5 ns), so the emission signals of these metal nanoshells could be distinctly isolated from the cellular background on the lifetime cell images. Moreover, these lifetimes were also different from one another, resulting in the emission signals of three metal nanoshells could be distinguished from one another on the cell images. This feature may offer an opportunity to detect multiple target molecules in a single cell imaging scan when the metal nanoshells are bound with various targets in the cells.
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Affiliation(s)
- Jian Zhang
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Yi Fu
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
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185
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He FA, Fan JT, Song F, Zhang LM, Lai-Wa Chan H. Fabrication of hybrids based on graphene and metal nanoparticles by in situ and self-assembled methods. NANOSCALE 2011; 3:1182-8. [PMID: 21258693 DOI: 10.1039/c0nr00672f] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In this work, we developed two novel strategies to attach metal nanoparticles (Au and Ag) to the surface of graphene nanosheets, in which graphene oxide was first modified by the linking molecule (3-mercaptopropyl)triethoxysilane and then subjected to different treatments including in situ and self-assembled techniques. The synthesis processes and the resulting hybrids were investigated by ultraviolet-visible measurements, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that both approaches could effectively immobilize metal nanoparticles onto a graphene surface, and that better distribution and size control of metal nanoparticles were obtained by the self-assembled method. Moreover, we prepared poly(vinylidene fluoride)/graphene-Ag nanocomposites by a solution blending method. The AC conductivity of the resulting nanocomposites could be increased significantly when the loading amount of graphene-Ag was only 2 wt%. We expect that such graphene-metal nanoparticle hybrids may be potentially useful in composite reinforcement, sensors, and electronic devices.
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Affiliation(s)
- Fu-An He
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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186
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Stamplecoskie KG, Scaiano JC. Kinetics of the Formation of Silver Dimers: Early Stages in the Formation of Silver Nanoparticles. J Am Chem Soc 2011; 133:3913-20. [DOI: 10.1021/ja108451v] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kevin G. Stamplecoskie
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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187
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Yang J, Lee JY, Ying JY. Phase transfer and its applications in nanotechnology. Chem Soc Rev 2011; 40:1672-96. [DOI: 10.1039/b916790k] [Citation(s) in RCA: 194] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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188
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Kravets VG, Zoriniants G, Burrows CP, Schedin F, Casiraghi C, Klar P, Geim AK, Barnes WL, Grigorenko AN. Cascaded optical field enhancement in composite plasmonic nanostructures. PHYSICAL REVIEW LETTERS 2010; 105:246806. [PMID: 21231549 DOI: 10.1103/physrevlett.105.246806] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 10/14/2010] [Indexed: 05/12/2023]
Abstract
We present composite plasmonic nanostructures designed to achieve cascaded enhancement of electromagnetic fields at optical frequencies. Our structures were made with the help of electron-beam lithography and comprise a set of metallic nanodisks placed one above another. The optical properties of reproducible arrays of these structures were studied by using scanning confocal Raman spectroscopy. We show that our composite nanostructures robustly demonstrate dramatic enhancement of the Raman signals when compared to those measured from constituent elements.
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Affiliation(s)
- V G Kravets
- School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK
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189
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Ahmed M, Narain R. Rapid synthesis of gold nanorods using a one-step photochemical strategy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:18392-18399. [PMID: 21043446 DOI: 10.1021/la103339g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Rapid synthesis of gold nanorods of controlled dimensions is one of the desired aspects of nanotechnology as a result of the potential of these nanomaterials for biomedical applications. The synthesis of gold nanorods has been achieved using a photoinitiator as an instant source of ketyl radicals, which allows the synthesis of gold nanorods in minutes. This is the first report providing a one-step synthesis of nanorods of controlled dimensions in 20-30 min using photoinitiator I-2959 as a source of ketyl radicals. Furthermore, the role of UV intensity, the concentration of silver ions, and the presence of cosolvents and a cosurfactant have been studied in detail in an effort to produce nanorods with controlled dimensions in higher yields. The role of acetone in nanorod synthesis has been explored in detail, and it has been demonstrated that, for the photochemical synthesis of nanorods using a photoinitiator, acetone is not a critical component and can be replaced by other water-miscible solvents, thus the successful synthesis of nanorods in tetrahydrofuran (THF) has been demonstrated. It has also been found that a cosurfactant and an organic solvent are not required for the synthesis of nanorods; however, their presence is found to improve the monodispersity of nanorod samples, in addition to providing a higher yield.
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Affiliation(s)
- Marya Ahmed
- Department of Chemical and Materials Engineering, University of Alberta, 116th Street and 85th Avenue, Edmonton, Alberta T6G 2G6, Canada
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190
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Lamberti C, Zecchina A, Groppo E, Bordiga S. Probing the surfaces of heterogeneous catalysts by in situ IR spectroscopy. Chem Soc Rev 2010; 39:4951-5001. [PMID: 21038053 DOI: 10.1039/c0cs00117a] [Citation(s) in RCA: 358] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This critical review describes the reactivity of heterogeneous catalysts from the point of view of four simple, but essential for Chemistry, molecules (namely dihydrogen, carbon monoxide, nitrogen monoxide and ethylene) that are considered as probes or as reactants in combination with "in situ" controlled temperature and pressure Infrared spectroscopy. The fundamental properties of H(2), CO, NO and C(2)H(4) are shortly described in order to justify their different behaviour in respect of isolated sites in different environments, extended surfaces, clusters, crystalline or amorphous materials. The description is given by considering some "key studies" and trying to evidence similarities and differences among surfaces and probes (572 references).
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Affiliation(s)
- Carlo Lamberti
- Department of Inorganic, Physical and Materials Chemistry, NIS Centre of Excellence, University of Turin. Via P. Giuria 7, 10125 Torino, Italy
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191
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Nagasaki Y. Engineering of poly(ethylene glycol) chain-tethered surfaces to obtain high-performance bionanoparticles. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:054505. [PMID: 27877362 PMCID: PMC5090621 DOI: 10.1088/1468-6996/11/5/054505] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Revised: 01/10/2011] [Accepted: 10/06/2010] [Indexed: 05/28/2023]
Abstract
A poly(ethylene glycol)-b-poly[2-(N,N-dimethylamino)ethyl methacrylate] block copolymer possessing a reactive acetal group at the end of the poly(ethylene glycol) (PEG) chain, that is, acetal-PEG-b-PAMA, was synthesized by a proprietary polymerization technique. Gold nanoparticles (GNPs) were prepared using the thus-synthesized acetal-PEG-b-PAMA block copolymer. The PEG-b-PAMA not only acted as a reducing agent of aurate ions but also attached to the nanoparticle surface. The GNPs obtained had controlled sizes and narrow size distributions. They also showed high dispersion stability owing to the presence of PEG tethering chains on the surface. The same strategy should also be applicable to the fabrication of semiconductor quantum dots and inorganic porous nanoparticles. The preparation of nanoparticles in situ, i.e. in the presence of acetal-PEG-b-PAMA, gave the most densely packed polymer layer on the nanoparticle surface; this was not observed when coating preformed nanoparticles. PEG/polyamine block copolymer was more functional on the metal surface than PEG/polyamine graft copolymer, as confirmed by angle-dependent x-ray photoelectron spectroscopy. We successfully solubilized the C60 fullerene into aqueous media using acetal-PEG-b-PAMA. A C60/acetal-PEG-b-PAMA complex with a size below 5 nm was obtained by dialysis. The preparation and characterization of these materials are described in this review.
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Affiliation(s)
- Yukio Nagasaki
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
- Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba, Ibaraki, Japan
- Center for Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, Ibaraki, Japan
- Master's School of Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Satellite Laboratory, International Center for Materials Nanoarchitectonics (MANA), National Institute of Materials Science (NIMS), Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
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192
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Hebeish A, El-Rafie M, Abdel-Mohdy F, Abdel-Halim E, Emam H. Carboxymethyl cellulose for green synthesis and stabilization of silver nanoparticles. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.06.020] [Citation(s) in RCA: 202] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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193
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Lee CY, Huang CH, Wei GT. Behaviors of ionic liquids in the phase transfer of aqueous metal nanoparticles. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.06.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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194
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Liu J, Ruffini N, Pollet P, Llopis-Mestre V, Dilek C, Eckert CA, Liotta CL, Roberts CB. More Benign Synthesis of Palladium Nanoparticles in Dimethyl Sulfoxide and Their Extraction into an Organic Phase. Ind Eng Chem Res 2010. [DOI: 10.1021/ie902013g] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juncheng Liu
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Nicholas Ruffini
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Pamela Pollet
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Veronica Llopis-Mestre
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Cerag Dilek
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles A. Eckert
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles L. Liotta
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Christopher B. Roberts
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
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195
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Gholipour Y, Giudicessi SL, Nonami H, Erra-Balsells R. Diamond, Titanium Dioxide, Titanium Silicon Oxide, and Barium Strontium Titanium Oxide Nanoparticles as Matrixes for Direct Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Analysis of Carbohydrates in Plant Tissues. Anal Chem 2010; 82:5518-26. [DOI: 10.1021/ac1003129] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yousef Gholipour
- Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan, and CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 P, Ciudad Universitaria, 1428-Buenos Aires, Argentina
| | - Silvana L. Giudicessi
- Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan, and CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 P, Ciudad Universitaria, 1428-Buenos Aires, Argentina
| | - Hiroshi Nonami
- Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan, and CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 P, Ciudad Universitaria, 1428-Buenos Aires, Argentina
| | - Rosa Erra-Balsells
- Plant Biophysics/Biochemistry Research Laboratory, Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan, and CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, 3 P, Ciudad Universitaria, 1428-Buenos Aires, Argentina
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196
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Sun X, Wei W. Electrostatic-assembly-driven formation of micrometer-scale supramolecular sheets of (3-aminopropyl)triethoxysilane(APTES)-HAuCl4 and their subsequent transformation into stable APTES bilayer-capped gold nanoparticles through a thermal process. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:6133-6135. [PMID: 20356097 DOI: 10.1021/la100646e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this letter, we demonstrate for the first time the electrostatically driven assembly of (3-aminopropyl)triethoxysilane (APTES) and HAuCl(4) in aqueous media into novel micrometer-scale supramolecular sheets and their subsequent transformation into small, stable APTES bilayer-capped gold nanoparticles through a thermal process. The nanoparticle formation mechanism is also discussed.
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Affiliation(s)
- Xuping Sun
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, PR China.
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197
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198
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Molinari E, Tomellini M. Evidence for Vibrational Excitation of the Adlayer in Exoergic Processes at Metal Surfaces: H-atom Abstraction and Recombination and Adsorption-stimulated Desorption of CO. Z PHYS CHEM 2010. [DOI: 10.1524/zpch.2010.5484] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The theoretical model presented in the previous paper predicts the possibility of vibrational excitation of the adlayer in exoergic process at metal surfaces to an extent determined by the interplay of reaction rates and energy dissipation into the metal. In the present paper this model will be employed for studying the following systems: a)The abstraction of Ds adspecies by Hgas and the accompanying H-atom recombination and b) the adsorption-stimulated desorption of COs in the presence of adsorbing COgas. Proper reduction of literature data provides the evidence for the existence of vibrational excitation of the H-Me and of the CO-Me adlayers, witnessed by desorption rates that are orders of magnitude larger than those expected for systems in Boltzmann equilibrium. Application of the model to Ds+Hgas relates the vibrational excitation of the adlayer and the corresponding non-Boltzmann desorption rates to the parameter Z/K and to the flux of adsorbing species. Rate coefficients K for vibrational relaxation of the H-Me bondare in the range 1013-1012 s−1 and decrease with increasing surface coverage σ. The analysis of COs desorption in the presence of adsorbing COgas confirms the dependence of desorption rates on Z/K, the coverage dependence of the rate coefficients K for energy relaxation of the CO-Me bond and brings out the predicted influence of gas pressure on the over-population of the vibrational levels of adsorbed CO. The decrease of K observed in both systems is discussed in terms of energy relaxation processes involving electron-hole pair excitation at the metal surface and it should be linked to the decrease of the surface electron density caused by the adsorbates.
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199
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Zhang J, Fu Y, Jiang F, Lakowicz JR. Metal Nanoshell - Capsule for Light-Driven Release of Small Molecule. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2010; 114:7635-7659. [PMID: 20514138 PMCID: PMC2875782 DOI: 10.1021/jp911537w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the release of small molecules from the metal nanoshells driven by the laser irradiation. The metal nanoshells were composed of 50 nm silica cores and variable thick silver shells of 10 and 30 nm. The small molecule fluorophores of Rhodamine 123 were physically absorbed in the silica cores of metal nanoshells and released through the metal walls. The release rate was significantly increased with the laser irradiation depending on the metal shell thickness: a thicker metal nanoshell leads to a faster release. The results were interpreted by the photothermal effect of metal nanoshells that could convert the light into the thermal energy via coupling interactions of light with the metal plasmon resonances of shells. The metal nanoshells may be potentially used as the capsules for the controlled release of drugs as other molecules.
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Affiliation(s)
- Jian Zhang
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Yi Fu
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Feng Jiang
- Division of Molecular Pathology, Department of Pathology, University of Maryland School of Medicine, 10 South Pine Street, Baltimore, MD 21201
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
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200
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Nakamura T, Hirata N, Nagaoka S, Nakajima A. Two-photon photoemission spectroscopy for silver nanoparticles on a hydrogen-terminated Si(111) surface: Metal nanoparticle-enhanced photoemission. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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