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Sher O, Han Y, Xu H, Li H, Daun T, Kumar S, Grigoriev A, Panda PK, Orthaber A, Serein-Spirau F, Jarrosson T, Jafri SHM, Leifer K. Analysis of molecular ligand functionalization process in nano-molecular electronic devices containing densely packed nano-particle functionalization shells. NANOTECHNOLOGY 2022; 33:255706. [PMID: 35276678 DOI: 10.1088/1361-6528/ac5cfc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Molecular electronic devices based on few and single-molecules have the advantage that the electronic signature of the device is directly dependent on the electronic structure of the molecules as well as of the electrode-molecule junction. In this work, we use a two-step approach to synthesise functionalized nanomolecular electronic devices (nanoMoED). In first step we apply an organic solvent-based gold nanoparticle (AuNP) synthesis method to form either a 1-dodecanethiol or a mixed 1-dodecanethiol/ω-tetraphenyl ether substituted 1-dodecanethiol ligand shell. The functionalization of these AuNPs is tuned in a second step by a ligand functionalization process where biphenyldithiol (BPDT) molecules are introduced as bridging ligands into the shell of the AuNPs. From subsequent structural analysis and electrical measurements, we could observe a successful molecular functionalization in nanoMoED devices as well as we could deduce that differences in electrical properties between two different device types are related to the differences in the molecular functionalization process for the two different AuNPs synthesized in first step. The same devices yielded successful NO2gas sensing. This opens the pathway for a simplified synthesis/fabrication of molecular electronic devices with application potential.
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Affiliation(s)
- Omer Sher
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | - Yuanyuan Han
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Haoyuan Xu
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- School of Metallurgy, Northeastern University, Shenyang City, 110819, People's Republic of China
| | - Hu Li
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Shandong Technology Centre of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan 250101, People's Republic of China
| | - Tianbo Daun
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Sharath Kumar
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
| | - Anton Grigoriev
- Condensed Matter Theory, Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala SE-75120, Sweden
| | - Pritam Kumar Panda
- Condensed Matter Theory, Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala SE-75120, Sweden
| | - Andreas Orthaber
- Department of Chemistry, Ångström Laboratory, Uppsala University, PO Box 523, Uppsala SE-75120, Sweden
| | - Francoise Serein-Spirau
- Université de Montpellier, Institut Charles Gerhardt de Montpellier, UMR CNRS 5253, Ecole Nationale Supérieure de Chimie de Montpellier, 1919 route de Mende, F-34000 Montpellier, France
| | - Thibaut Jarrosson
- Université de Montpellier, Institut Charles Gerhardt de Montpellier, UMR CNRS 5253, Ecole Nationale Supérieure de Chimie de Montpellier, 1919 route de Mende, F-34000 Montpellier, France
| | - S Hassan M Jafri
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
- Department of Electrical Engineering, Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | - Klaus Leifer
- Applied Materials Science, Department of Engineering Sciences, Uppsala University, PO Box 534, Uppsala SE-75121, Sweden
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Barthélemy A, Glootz K, Scherer H, Hanske A, Krossing I. Ga +-catalyzed hydrosilylation? About the surprising system Ga +/HSiR 3/olefin, proof of oxidation with subvalent Ga + and silylium catalysis with perfluoroalkoxyaluminate anions. Chem Sci 2022; 13:439-453. [PMID: 35126976 PMCID: PMC8729802 DOI: 10.1039/d1sc05331k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 11/21/2021] [Indexed: 12/19/2022] Open
Abstract
Already 1 mol% of subvalent [Ga(PhF)2]+[pf]- ([pf]- = [Al(ORF)4]-, RF = C(CF3)3) initiates the hydrosilylation of olefinic double bonds under mild conditions. Reactions with HSiMe3 and HSiEt3 as substrates efficiently yield anti-Markovnikov and anti-addition products, while bulkier substrates such as HSiiPr3 are less reactive. Investigating the underlying mechanism by gas chromatography and STEM analysis, we unexpectedly found that H2 and metallic Ga0 formed. Without the addition of olefins, the formation of R3Si-F-Al(ORF)3 (R = alkyl), a typical degradation product of the [pf]- anion in the presence of a small silylium ion, was observed. Electrochemical analysis revealed a surprisingly high oxidation potential of univalent [Ga(PhF)2]+[pf]- in weakly coordinating, but polar ortho-difluorobenzene of E 1/2(Ga+/Ga0; oDFB) = +0.26-0.37 V vs. Fc+/Fc (depending on the scan rate). Apparently, subvalent Ga+, mainly known as a reductant, initially oxidizes the silane and generates a highly electrophilic, silane-supported, silylium ion representing the actual catalyst. Consequently, the [Ga(PhF)2]+[pf]-/HSiEt3 system also hydrodefluorinates C(sp3)-F bonds in 1-fluoroadamantane, 1-fluorobutane and PhCF3 at room temperature. In addition, both catalytic reactions may be initiated using only 0.2 mol% of [Ph3C]+[pf]- as a silylium ion-generating initiator. These results indicate that silylium ion catalysis is possible with the straightforward accessible weakly coordinating [pf]- anion. Apparently, the kinetics of hydrosilylation and hydrodefluorination are faster than that of anion degradation under ambient conditions. These findings open up new windows for main group catalysis.
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Affiliation(s)
- Antoine Barthélemy
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Kim Glootz
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Harald Scherer
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Annaleah Hanske
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Universität Freiburg Albertstr. 21 79104 Freiburg Germany
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3
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Morphology-Controlled Versatile One-Pot Synthesis of Hydrophobic Gold Nanodots, Nanobars, Nanorods, and Nanowires and Their Applications in Surface-Enhanced Raman Spectroscopy. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9050935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Many previously reported syntheses of gold nanoparticles required lengthy reaction times, complicated operations, high temperatures, or multi-step manipulations. In this work, a morphology-controlled versatile one-pot synthesis of hydrophobic gold nanodots, nanobars, nanorods, and nanowires has been developed. A series of gold nanomaterials ranging from round nanodots, short nanobars, and long nanorods to ultrathin and ultralong nanowires (diameter <2 nm, length >2 μm) have been readily prepared by simply adjusting the feeding ratio of chloroauric acid to oleylamine, oleic acid, and triphenylsilane. The silk-like ultralong and ultrathin nanowires were found to have a single crystalline structure and may have significant potential applications in microelectronics and biosensors. Large sizes of gold spherical nanoparticles were obtained from gold nanodots via a seed-mediated growth approach. These nanoparticles and ultralong nanowires showed excellent surface-enhanced Raman scattering (SERS) activity in organic solvents and, therefore, were employed as efficient organic-soluble SERS substrates for the detection of hydrophobic food toxicants, such as 3,4-benzopyrene, and carcinogens, such as benzidine.
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Chaudhary P, Korde R, Gupta S, Sureshbabu P, Sabiah S, Kandasamy J. An Efficient Metal-Free Method for the Denitrosation of Aryl N
-Nitrosamines at Room Temperature. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701047] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Priyanka Chaudhary
- Department of Chemistry; Indian Institute of Technology (BHU); Varanasi Uttar Pradesh- 221005
| | - Rishi Korde
- Department of Chemistry; Indian Institute of Technology (BHU); Varanasi Uttar Pradesh- 221005
| | - Surabhi Gupta
- Department of Chemistry; Indian Institute of Technology (BHU); Varanasi Uttar Pradesh- 221005
| | - Popuri Sureshbabu
- Department of Chemistry; Pondicherry University; Pondicherry- 605014
| | | | - Jeyakumar Kandasamy
- Department of Chemistry; Indian Institute of Technology (BHU); Varanasi Uttar Pradesh- 221005
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Jang S, Kim K, Jeon J, Kang D, Sohn BH. Supracolloidal chains of patchy micelles of diblock copolymers with in situ synthesized nanoparticles. SOFT MATTER 2017; 13:6756-6760. [PMID: 28937168 DOI: 10.1039/c7sm01497j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Supracolloidal chains of diblock copolymer micelles were functionalized with gold and silver nanoparticles (NPs). Both NPs were independently synthesized in situ in the core of spherical micelles which were then converted to patchy micelles. With these patchy micelles as colloidal monomers, supracolloidal chains were polymerized by combining the patches of neighboring micelles. Since all micelles contained NPs, NPs were incorporated in every repeat unit of chains. In addition, a single gold NP was synthesized in the micellar core in contrast to several silver NPs so that we differentiated the chains with Au NPs from those with Ag NPs by the number of NPs in the repeat unit as well as by plasmonic bands in UV-Vis spectra.
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Affiliation(s)
- Sukwoo Jang
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea.
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6
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Shankar R, Jangir B, Sharma A. A novel synthetic approach to poly(hydrosiloxane)s via hydrolytic oxidation of primary organosilanes with a AuNPs-stabilized Pickering interfacial catalyst. RSC Adv 2017. [DOI: 10.1039/c6ra25557d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
A simple and versatile approach based on AuNPs-stabilized Pickering catalyst in water–chloroform biphasic medium has been developed for the synthesis of poly(alkyl/arylhydrosiloxane)s.
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Affiliation(s)
- Ravi Shankar
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Bhawana Jangir
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Asmita Sharma
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
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7
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Orthaber A, Löfås H, Öberg E, Grigoriev A, Wallner A, Jafri SHM, Santoni MP, Ahuja R, Leifer K, Ottosson H, Ott S. Cooperative Gold Nanoparticle Stabilization by Acetylenic Phosphaalkenes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504834] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Orthaber A, Löfås H, Öberg E, Grigoriev A, Wallner A, Jafri SHM, Santoni MP, Ahuja R, Leifer K, Ottosson H, Ott S. Cooperative Gold Nanoparticle Stabilization by Acetylenic Phosphaalkenes. Angew Chem Int Ed Engl 2015. [PMID: 26211907 PMCID: PMC4557036 DOI: 10.1002/anie.201504834] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Acetylenic phosphaalkenes (APAs) are used as a novel type of ligands for the stabilization of gold nanoparticles (AuNP). As demonstrated by a variety of experimental and analytical methods, both structural features of the APA, that is, the P=C as well as the C≡C units are essential for NP stabilization. The presence of intact APAs on the AuNP is demonstrated by surface-enhanced Raman spectroscopy (SERS), and first principle calculations indicate that bonding occurs most likely at defect sites on the Au surface. AuNP-bound APAs are in chemical equilibrium with free APAs in solution, leading to a dynamic behavior that can be explored for facile place-exchange reactions with other types of anchor groups such as thiols or more weakly binding phosphine ligands.
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Affiliation(s)
- Andreas Orthaber
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden).
| | - Henrik Löfås
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Elisabet Öberg
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden)
| | - Anton Grigoriev
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Andreas Wallner
- Department of Chemistry - BMC, Uppsala University, Box 576, 75123 Uppsala (Sweden)
| | - S Hassan M Jafri
- Department of Engineering Sciences, Ångström Laboratories, Uppsala University, Box 534, 75121 Uppsala (Sweden)
| | - Marie-Pierre Santoni
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden)
| | - Rajeev Ahuja
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
| | - Klaus Leifer
- Department of Engineering Sciences, Ångström Laboratories, Uppsala University, Box 534, 75121 Uppsala (Sweden)
| | - Henrik Ottosson
- Department of Chemistry - BMC, Uppsala University, Box 576, 75123 Uppsala (Sweden)
| | - Sascha Ott
- Department of Chemistry/Ångström Laboratories, Uppsala University, Box 523, 75120 Uppsala (Sweden).
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9
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Barngrover BM, Manges TJ, Aikens CM. Prediction of nonradical Au(0)-containing precursors in nanoparticle growth processes. J Phys Chem A 2015; 119:889-95. [PMID: 25580885 DOI: 10.1021/jp509676a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
This density functional theory (DFT) investigation examines the formation of nonradical Au(0) species from the reduction of Au(I) species. The Au(I) complexes of interest are AuCl2(-), AuBr2(-), AuI2(-), AuClPH3, and AuCl(H)SCH3(-), which are precursors for gold nanoparticle and cluster formation. Reaction of two of the Au(I) species with a hydride results in ejection of two of the ligands and formation of Au2 with two ligands still attached. AuX2(-) (where X = Cl, Br, or I) reactions eject two halides and form Au2X2(2-). AuClL(-) (where L = PH3, HSCH3, or SCH3(-)) reactions can eject either chloride, HCl, PH3, HSCH3, or SCH3(-) and form Au(0)L2(q-) or Au(0)ClL(q-) (q = 0, 1, 2). The Au2Cl2(2-) complex can further react with AuCl2(-), which forms Au3Cl3(2-) and a chloride anion. The new Au3Cl3(2-) species can then react with AuCl2(-) or Au2Cl2(2-) or with another Au3Cl3(2-). Larger clusters can be formed from these precursors. In this work, reactions in both methanol and benzene solvents are considered as models for one-phase and two-phase gold nanoparticle growth processes. Overall, this investigation shows how Au(0)-containing species can be formed without assuming the formation of Au(0) atoms (radical species).
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Affiliation(s)
- Brian M Barngrover
- Department of Chemistry, Kansas State University , Manhattan, Kansas 66506, United States
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10
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Mori A, Sugie A, Yamauchi H, Miyamura K, Kumazawa K, Tanaka S, Kanie K, Muramatsu A. Introduction of Heteroarene Functionality on the Bipedal-Thiol-Capped Gold Nanoparticle by Deprotonative C-H Coupling with Palladium Complex. HETEROCYCLES 2014. [DOI: 10.3987/com-13-s(s)1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Chen Q, Wang J, Shao L. Nanoparticle-Loaded Cylindrical Micelles from Nanopore Extrusion of Block Copolymer Spherical Micelles. Macromol Rapid Commun 2013; 34:1850-5. [DOI: 10.1002/marc.201300702] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 10/20/2013] [Indexed: 12/31/2022]
Affiliation(s)
- Qianjin Chen
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N. T. Hong Kong
| | - Jianqi Wang
- Department of Chemistry; The Chinese University of Hong Kong; Shatin N. T. Hong Kong
| | - Lei Shao
- Department of Physics; The Chinese University of Hong Kong; Shatin N. T. Hong Kong
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12
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Wu BH, Yang HY, Huang HQ, Chen GX, Zheng NF. Solvent effect on the synthesis of monodisperse amine-capped Au nanoparticles. CHINESE CHEM LETT 2013. [DOI: 10.1016/j.cclet.2013.03.054] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Shankar R, Chaudhary M, Molloy KC, Kociok-Köhn G. New cyclotetrasiloxanes bearing sila-alkyl substituted side chains and their applications as templates for gold nanowires. Dalton Trans 2013; 42:7768-74. [DOI: 10.1039/c3dt50284h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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14
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Li M, Kim DP, Jeong GY, Seo DK, Park CP. Reductive surface synthesis of gold nanoparticles on silicate glass and their biochemical sensor applications. BIOMICROFLUIDICS 2012; 6:44111. [PMID: 24324531 PMCID: PMC3557795 DOI: 10.1063/1.4769780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 10/31/2012] [Indexed: 06/03/2023]
Abstract
Gold nanoparticles (Au NPs) were directly synthesized on the surface of polyvinylsilazane (PVSZ, -[(vinyl)SiH-NH2]-) without use of extra reductive additives. The reductive Si-H functional groups on the surface of cured PVSZ acted as surface bound reducing agents to form gold metal when contacted with an aqueous Au precursor (HAuCl4) solution, leading to formation of Au NPs adhered to silicate glass surface. The Au NPs-silicate platforms were preliminarily tested to detect Rhodamine B (1 μM) by surface enhanced Raman scattering. Furthermore, gold microelectrode obtained by post-chemical plating was used as an integrated amperometric detection element in the polydimethylsilane-glass hybrid microfluidic chip.
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Affiliation(s)
- M Li
- Environmental Science and Engineering, Yangzhou University, 225-009 Yangzhou, China
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15
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Sugie A, Song H, Horie T, Ohmura N, Kanie K, Muramatsu A, Mori A. Synthesis of thiol-capped gold nanoparticle with a flow system using organosilane as a reducing agent. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.06.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Shankar R, Sahoo U. Scope of network polysilanes in the synthesis of fluorescent silver and gold nanoparticles/nanoclusters-modulations of their optical properties in the presence of Hg(II) ions. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25876] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Sugie A, Kumazawa K, Hatta T, Kanie K, Muramatsu A, Mori A. Cross Coupling on Gold Nanoparticles. Effect of Reinforced Affinity of Organic Group with Bipedal Thiol. CHEM LETT 2011. [DOI: 10.1246/cl.2011.1450] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Wallner A, Jafri SHM, Blom T, Gogoll A, Leifer K, Baumgartner J, Ottosson H. Formation and NMR spectroscopy of ω-thiol protected α,ω-alkanedithiol-coated gold nanoparticles and their usage in molecular charge transport junctions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9057-9067. [PMID: 21667939 DOI: 10.1021/la2019007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Gold nanoparticles (AuNPs) coated with stabilizing molecular monolayers are utilized in areas ranging from life sciences to nanoelectronics. Here we present a novel and facile one-pot single phase procedure for the preparation of stable AuNPs with good dispersity, which are coated with α,ω-alkanedithiols whose outer ω-thiol is protected by a triphenylmethyl group. Using dielectrophoresis we were able to trap these AuNPs, coated with ω-thiol protecting groups, in a 20 nm gold electrode nanogap. The ω-thiol group was then deprotected under acidic conditions in situ once the AuNPs were correctly positioned in the device. The subsequent deprotection resulted in an increase of conductance by up to 3 orders of magnitude, indicating that the isolated dithiol-coated AuNPs were fused into a covalently bonded network with AuNP-molecule-AuNP as well as electrode-molecule-AuNP linkages. Furthermore, complete characterization of the AuNP surface-bonded alkanedithiols was achieved using a series of one- and two-dimensional NMR spectroscopy techniques. Our spectra of the molecule-coated AuNPs show well-resolved signals, only slightly broader than for free molecules in solution, which is in contrast to many earlier reported NMR spectral data of molecules attached to AuNPs. Complementary diffusion NMR spectroscopic experiments were performed to prove that the observed alkanedithiols are definitely surface-bonded species and do not exist in free and unattached form.
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Affiliation(s)
- Andreas Wallner
- Department of Biochemistry and Organic Chemistry, Uppsala University, Uppsala, Sweden.
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Sugie A, Yamanaka T, Kumazawa K, Hatta T, Ueda Y, Kanie K, Muramatsu A, Mori A. Solvent Diversity in the Preparation of Alkanethiol-capped Gold Nanoparticles. An Approach with a Gold(I) Thiolate Complex. CHEM LETT 2010. [DOI: 10.1246/cl.2010.319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Sugie A, Hatta T, Kanie K, Muramatsu A, Mori A. Synthesis of Thiol-capped Gold Nanoparticles with Organometallic Reagents as a New Class of Reducing Agent. CHEM LETT 2009. [DOI: 10.1246/cl.2009.562] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Curtis-Long M, Aye Y. Vinyl-, Propargyl-, and Allenylsilicon Reagents in Asymmetric Synthesis: A Relatively Untapped Resource of Environmentally Benign Reagents. Chemistry 2009; 15:5402-16. [DOI: 10.1002/chem.200900337] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Feng H, Yang Y, You Y, Li G, Guo J, Yu T, Shen Z, Wu T, Xing B. Simple and rapid synthesis of ultrathin gold nanowires, their self-assembly and application in surface-enhanced Raman scattering. Chem Commun (Camb) 2009:1984-6. [DOI: 10.1039/b822507a] [Citation(s) in RCA: 233] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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