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Lee SH, Park KH, Jeon T, Jeon GW, Kim S, Lee SW, Wu S, Park DH, Jung SC, Kim DY, Jang JW. Band Alignment Enabling Effective Charge Transfer for the Highly Enhanced Raman Scattering and Fluorescence of Metal-Nanoparticle-Decorated Conjugated Polymer Nanowires. J Phys Chem Lett 2023; 14:750-762. [PMID: 36651880 DOI: 10.1021/acs.jpclett.2c03602] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The charge transfer (CT) process has attracted much attention due to its contribution to the improvement of spectroscopic phenomena such as Raman scattering and fluorescence. A current challenge is understanding what factors can influence CT. Here, it is demonstrated that the enhancement factor (EF) of CT (∼2000) can reach the level of electromagnetic enhancement (∼1680) when resonant CT is carried out by (Fermi level energy) band alignment between a metal nanoparticle (NP) and conjugated polymer (polypyrrole (PPy)) nanowire (NW). This band alignment results in an on- or off-resonant CT. As a proof of concept for CT based surface enhanced Raman scattering (SERS) template, the Ag NPs-decorated PPy NW is utilized to effectively enhance the Raman signal of rhodamine 6G (EF of 5.7 × 105). Hence, by means of our demonstration, it is proposed that controlling the band alignment should be considered an important parameter for obtaining a large EF of spectroscopic phenomena.
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Affiliation(s)
- Seung-Hoon Lee
- Department of Chemistry, Duke University, Durham, North Carolina27708, United States
| | - Ki Hong Park
- Department of Physics, Pukyong National University, Busan48513, Republic of Korea
| | - Taegon Jeon
- Department of Physics, Pukyong National University, Busan48513, Republic of Korea
| | - Gi Wan Jeon
- Division of Physics and Semiconductor Science, Dongguk University, Seoul, 04620, Republic of Korea
- Quantum-functional Semiconductor Research Center, Dongguk University, Seoul04620, Republic of Korea
| | - Seokho Kim
- Department of Chemical Engineering, Inha University, Incheon22212, Republic of Korea
| | - Seung Woo Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea
| | - Sangwook Wu
- Department of Physics, Pukyong National University, Busan48513, Republic of Korea
| | - Dong Hyuk Park
- Department of Chemical Engineering, Inha University, Incheon22212, Republic of Korea
- Program in Biomedical Science and Engineering, Inha University, Incheon22212, Republic of Korea
| | - Sung Chul Jung
- Department of Physics, Pukyong National University, Busan48513, Republic of Korea
| | - Deuk Young Kim
- Division of Physics and Semiconductor Science, Dongguk University, Seoul, 04620, Republic of Korea
- Quantum-functional Semiconductor Research Center, Dongguk University, Seoul04620, Republic of Korea
| | - Jae-Won Jang
- Division of Physics and Semiconductor Science, Dongguk University, Seoul, 04620, Republic of Korea
- Quantum-functional Semiconductor Research Center, Dongguk University, Seoul04620, Republic of Korea
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Firoz Babu K, Dhandapani P, Maruthamuthu S, Anbu Kulandainathan M. One pot synthesis of polypyrrole silver nanocomposite on cotton fabrics for multifunctional property. Carbohydr Polym 2012; 90:1557-63. [PMID: 22944416 DOI: 10.1016/j.carbpol.2012.07.030] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 06/25/2012] [Accepted: 07/09/2012] [Indexed: 10/28/2022]
Abstract
Polymer-silver nanocomposites modified cotton fabrics were prepared by in situ chemical oxidative polymerization using pyrrole and silver nitrate. In a redox reaction between pyrrole and silver nitrate, silver ions oxidize the pyrrole monomer and get reduced. This reduced silver as nanoparticles deposited on/into the polypyrrole/cotton matrix layer and the interaction between silver and polypyrrole was by adsorption or electrostatic interaction. The structure and composite formation on cotton fiber was investigated using SEM, FT-IR, XPS and XRD. The results showed that a strong interaction existing between silver nanoparticles with polypyrrole/cotton matrix. FT-IR studies clearly indicated that the interaction between polypyrrole (-N-H) and cellulose (>C-OH) was by hydrogen bonding. It is observed that the conductivity of the composite coated fabrics has been increased by the incorporation of silver nanoparticles. In the synthesized composites, silver content plays an important role in the conductivity and antimicrobial activity rate of the fabrics against gram positive Staphylococcus aureus and gram negative Escherichia coli bacteria.
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Affiliation(s)
- K Firoz Babu
- CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, India
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Fletcher M, Alexson DM, Prokes S, Glembocki O, Vivoni A, Hosten C. Surface-enhanced Raman scattering of a Ag/oligo(phenyleneethynylene)/Ag sandwich. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:706-711. [PMID: 21190893 DOI: 10.1016/j.saa.2010.11.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 11/01/2010] [Accepted: 11/30/2010] [Indexed: 05/30/2023]
Abstract
α,ω-Dithiols are a useful class of compounds in molecular electronics because of their ability to easily adsorb to two metal surfaces, producing a molecular junction. We have prepared Ag nanosphere/oligo(phenyleneethynylene)/Ag sol (AgNS/OPE/Ag sol) and Ag nanowire/oligo(phenyleneethynylene)/Ag sol (AgNW/OPE/Ag sol) sandwiches to simulate the architecture of a molecular electronic device. This was achieved by self-assembly of OPE on the silver nanosurface, deprotection of the terminal sulfur, and deposition of Ag sol atop the monolayer. These sandwiches were then characterized by surface-enhanced Raman scattering (SERS) spectroscopy. The resulting spectra were compared to the bulk spectrum of the dimer and to the Ag nanosurface/OPE SERS spectra. The intensities of the SERS spectra in both systems exhibit a strong dependence on Ag deposition time and the results are also suggestive of intense interparticle coupling of the electromagnetic fields in both the AgNW/OPE/Ag and the AgNS/OPE/Ag systems. Three previously unobserved bands (1219, 1234, 2037 cm(-1)) arose in the SER spectra of the sandwiches and their presence is attributed to the strong enhancement of the electromagnetic field which is predicted from the COSMOL computational package. The 544 cm(-1) disulfide bond which is observed in the spectrum of solid OPE but is absent in the AgNS/OPE/Ag and AgNW/OPE/Ag spectra is indicative of chemisorption of OPE to the nanoparticles through oxidative dissociation of the disulfide bond.
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Affiliation(s)
- Melissa Fletcher
- Department of Chemistry, Howard University, Washington, DC 20059, United States
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Yang KH, Liu YC, Yu CC. Effects of substrate temperatures on improved surface-enhanced Raman scattering. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.02.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Tsai YC, Hsu PC, Lin YW, Wu TM. Electrochemical deposition of silver nanoparticles in multiwalled carbon nanotube-alumina-coated silica for surface-enhanced Raman scattering-active substrates. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2008.12.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Muniz-Miranda M, Pergolese B, Bigotto A, Giusti A. Stable and efficient silver substrates for SERS spectroscopy. J Colloid Interface Sci 2007; 314:540-4. [PMID: 17659296 DOI: 10.1016/j.jcis.2007.05.089] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2007] [Revised: 05/22/2007] [Accepted: 05/23/2007] [Indexed: 10/23/2022]
Abstract
Silver substrates have been obtained, by depositing silver colloidal nanoparticles on a roughened silver plate treated with 1,10-phenanthroline, and checked by means of AFM microscopy and Raman spectroscopy. The ligand molecules are located between two silver substrates and undergo the SERS (Surface Enhanced Raman Scattering) enhancement of both the roughened silver plate and the silver colloidal layer deposited on it. These SERS-active substrates, which show the advantages of being stable with respect to the metal colloidal suspensions, along with an easy and reproducible preparation, can be very useful for catalytic and analytical applications of the SERS spectroscopy.
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