Surface enhanced Raman scattering of nano diamond using visible‐light‐activated TiO<sub>2</sub> as a catalyst to photo‐reduce nano‐structured silver from AgNO<sub>3</sub> as SERS‐active substrate

Hong, Z. C.; Perevedentseva, E.; Treschev, S.; Wang, J.-B.; Cheng, Chia‐Liang

doi:10.1002/jrs.2223

Cited by 17 publications

(8 citation statements)

References 48 publications

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“…The 'tetragonal anatase structured' TiO 2 belongs to D194h (I4 1 /amd) space group and following normal lattice A 1g +B 1g +B 2g +E g . 33 The first E g peak at ~144 cm -1 , a characteristic of anatase TiO 2 was formed in the as-prepared TNCs. The peaks at 516 (corresponding to B 1g , A 2g ) and 635 cm -1 (correspond to E g ) modes of anatase TiO 2 are observed.…”

Section: Resultsmentioning

confidence: 92%

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Mali

Desai

Dalavi

et al. 2011

Photochem Photobiol Sci

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Cadmium sulfide (CdS) nanoparticle-sensitized titanium oxide nanocorals (TNC) were synthesized using a two-step deposition process. The TiO(2) nanocorals were grown on the conducting glass substrates (FTO) using A hydrothermal process and CdS nanoparticles were loaded on TNC using successive ionic layer adsorption and reaction (SILAR) method. The TiO(2), CdS and TiO(2)-CdS samples were characterized by optical absorption, X-ray diffraction (XRD), FT-Raman, FT-IR, scanning electron microscopy (SEM) and contact angle. Further, their photoelectrochemical (PEC) performance was tested in NaOH, Na(2)S-NaOH-S and Na(2)S electrolytes, respectively. When CdS nanoparticles are coated on TNCs, the optical absorption is found to be enhanced and band edge is red-shifted towards visible region. The TiO(2)-CdS sample exhibits improved photoelectrochemical (PEC) performance with maximum short circuit current of (J(sc)) 1.04 mA cm(-2). After applying these TiO(2)-CdS electrodes in photovoltaic cells, the photocurrent was found to be enhanced by 2.7 and 32.5 times, as compared with those of bare CdS and TiO(2) nanocorals films electrodes respectively. Also, the power conversion efficiency of TiO(2)-CdS electrodes is 0.72%, which is enhanced by about 16 and 29 times for TiO(2), CdS samples.

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Section: Resultsmentioning

confidence: 92%

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Mali

Desai

Dalavi

et al. 2011

Photochem Photobiol Sci

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“…As a wide-band gap semiconductor, TiO 2 is increasingly concerned in the SERS field nowadays. TiO 2 as an active substrate widens the application field for SERS in various areas, especially in photosensitive dye cell, , catalysis, biomedical, , and other industries. Meanwhile, the possible SERS mechanism on TiO 2 is discussed, which may help us understand the related SERS mechanism on semiconductor substrate as well as to understand the charge transfer process between adsorbates and substrates.…”

Section: Introductionmentioning

confidence: 99%

Charge-Transfer Effect on Surface-Enhanced Raman Scattering (SERS) in an Ordered Ag NPs/4-Mercaptobenzoic Acid/TiO₂ System

Zhang

et al. 2015

J. Phys. Chem. C

113

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With the explosive development of analysis and detection techniques based on surface-enhanced Raman scattering (SERS), the further understanding and exploitation of the chemical mechanism becomes particularly important. We investigated the charge transfer (CT) effect on SERS in a semiconductor−molecule−metal system constructed with Ag NPs, 4-mercaptobenzoic acid (MBA) molecule, and atomic level TiO 2 . To ensure more ordering, the system is constructed by a layer-by-layer self-assembly method. After introducing TiO 2 , we found that the relative band intensity of some peaks displayed a distinct difference, which is attributed to the Herzberg−Teller contribution that occurs via CT. We also proposed a possible mechanism responsible for the selective enhancement observed in the SERS spectra of the Ag NPs/MBA/ TiO 2 system. This work will not only provide much deeper insight into the CT mechanism in SERS but also help in the development of a method to construct metal−semiconductor-based SERS substrates. ■ INTRODUCTIONSince it was discovered on a rough silver electrode in 1974, the surface-enhanced Raman scattering (SERS) technique has gotten more and more attention because of its high sensitivity, high selectivity, and nondestructive trace detection. 1 Nowadays, SERS is being widely applied to many areas, such as ultrasensitive detection, biological analysis, biomedical application, and medical diagnosis. 2−5 As is known to all, there are two primary mechanisms that account for SERS: electromagnetic mechanism (EM) and chemical enhancement mechanism (CM). 6−8 EM requires the coupling of metallic nanoparticles and incident radiation, 9 whereas CM contains a charge transfer (CT) process between substrate and absorbate. 10−13 When molecules are adsorbed on the metal substrate, the Fermi energy level of metal nanoparticles and the HOMO and LUMO energy levels of adsorbed molecules interact with each other and shift. If the energy of incident laser matches with charge transfer transition energy, resonance electron transition occurs between the Fermi level of the substrate and the molecular orbital of the adsorbate. Then the molecular polarization can be changed, which produces the SERS effect. The interaction between molecules and substrate forms a new excited charge transfer state. 14,15 Both mechanisms contribute to the Raman enhancement. EM contributes more to the enhancement of SERS signal; however, CT also plays an important role. Many researchers have investigated CT in SERS with various materials. For most semiconductor materials, the surface plasmon resonant frequency is located in the infrared region. Thus, when semiconductor materials are applied as SERS substrate, the CT mechanism can be the dominant contribution to the surface-enhanced Raman signal on semiconductor substrate, which provides an extensive space for studying CT mechanism.As a wide-band gap semiconductor, TiO 2 is increasingly concerned in the SERS field nowadays. TiO 2 as an active substrate widens the application field for SERS in various areas,...

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“…Humic substance have high molecular weight naturally occurring in yellow-brown, by using TiO 2 80% humic acid reduction is reported ( Liu et al ., 2008 ), in another paper 65% reduction in humic acid reported ( Valencia et al ., 2018 ) In organic pollutant present in waste water in the form of nitrates, halides, ammonia, cyanide and thiocyanate these pollutant an effectively decompose by photocatalytic process. Different semiconductors nanoparticles such as TiO 2 against AgNO 3 , TiO ( López-Muñoz et al, 2016 , Hong et al, 2009 ) ZnO against Cr(Vi) and potassium cyanides ( Joshi and Shrivastava, 2011 , Bagabas et al, 2013 ) and CdS/Titanate nanotubes reported against ammonia in water ( Lee et al ., 2002 ).…”

Section: Application Of Photo-catalystmentioning

confidence: 99%

Role of Nanotechnology in Photocatalysis

Tahir

Sohaib

Sagir

et al. 2022

Encyclopedia of Smart Materials

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Surface enhanced Raman scattering of nano diamond using visible‐light‐activated TiO₂ as a catalyst to photo‐reduce nano‐structured silver from AgNO₃ as SERS‐active substrate

Cited by 17 publications

References 48 publications

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Charge-Transfer Effect on Surface-Enhanced Raman Scattering (SERS) in an Ordered Ag NPs/4-Mercaptobenzoic Acid/TiO₂ System

Role of Nanotechnology in Photocatalysis

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Surface enhanced Raman scattering of nano diamond using visible‐light‐activated TiO2 as a catalyst to photo‐reduce nano‐structured silver from AgNO3 as SERS‐active substrate

Cited by 17 publications

References 48 publications

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

CdS-sensitized TiO2 nanocorals: hydrothermal synthesis, characterization, application

Charge-Transfer Effect on Surface-Enhanced Raman Scattering (SERS) in an Ordered Ag NPs/4-Mercaptobenzoic Acid/TiO2 System

Role of Nanotechnology in Photocatalysis

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Surface enhanced Raman scattering of nano diamond using visible‐light‐activated TiO₂ as a catalyst to photo‐reduce nano‐structured silver from AgNO₃ as SERS‐active substrate

Charge-Transfer Effect on Surface-Enhanced Raman Scattering (SERS) in an Ordered Ag NPs/4-Mercaptobenzoic Acid/TiO₂ System