ChemInform Abstract: Relation Between SERS Intensity and Electronic Structures for a Series of Compounds C6H5(CH2)nCOOH (n: 0, 1, 2)

Wan, Chih-Wei; He, Tao; Gao, Xia; Li, J.; Xin, Howen; Liu, F.-C.

doi:10.1002/chin.198623044

Cited by 3 publications

(3 citation statements)

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“…In agreement with previous reports concerning the Raman spectrum of benzoic acid, the loss of the characteristic CxO stretching vibration at about 1650 cm~1 indicates that the molecular species adsorbed on the metal surface are carboxylate ions (COO~) of benzoate anions. 10,19,20 The SERS spectrum of benzoic acid with the most intense line at 1003 cm~1 shows a one-to-one correspondence with other SERS studies of this acid using silver-coated substrates.8,10,11 In contrast with silver-coated aluminabased substrate, the blank silver-doped solÈgel Ðlm as shown in Fig. 2(B) gives no background emission at 800È1200 cm~1 (Ref.…”

Section: Resultsmentioning

confidence: 75%

Silver-doped sol-gel films as the substrate for surface-enhanced Raman scattering

Lee

Dai

Young

1997

J. Raman Spectrosc.

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A method was developed to prepare silver-doped sol-gel Ðlms for surface-enhanced Raman scattering (SERS) detection. The technique involves Ðrst doping silver ions as a silver ammine complex into a sol-gel [ Ag(NH 3 ) 2 ' ] matrix, followed by chemical reduction of the doped silver ions into the corresponding silver metal particles. The silver-doped sol-gel Ðlms coated on a glass substrate exhibit strong enhancement (24 000-fold) of Raman scattering from molecules adsorbed on the surface. Very stable SERS spectra of benzoic acid over a period of 48 h were obtained with the new silver substrate.

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Section: Resultsmentioning

confidence: 75%

Silver-doped sol-gel films as the substrate for surface-enhanced Raman scattering

Lee

Dai

Young

1997

J. Raman Spectrosc.

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“…Given that carboxylic acids are adsorbed as carboxylates on metallic surfaces, − the discussion has been carried out by considering that this acid is adsorbed as benzoate anion (Bz − ). Benzoic acid is the simplest carboxylic acid derived from benzene, and there are many published works dealing with its structure or vibrational − and SERS spectra. − ,− Most of the published SERS data of benzoic acid have been analyzed on the basis of the SERS-EM selection rules by proposing hypothetical surface orientations of the adsorbate. However, these “propensity rules” cannot satisfactorily explain the specific and very strong enhancement of in-plane modes 8a and ν s (CO 2 − ), which is the most outstanding feature of the SERS of this molecule.…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering of Benzoate Anion Adsorbed on Silver Nanoclusters: Evidence of the Transient Formation of the Radical Dianion

et al. 2010

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Surface-enhanced Raman scattering (SERS) of benzoate recorded on silver electrode have been analyzed on the basis of a charge transfer (CT) enhancement mechanism similar to a resonance Raman (RR) process where a photoinduced electron transfer between a metal and an adsorbate takes place. Given that benzoic acid (BzH) is adsorbed on silver as benzoate anion (Bz -), this resonant CT process implies the transient formation of the corresponding radical dianion (Bz •2-). The dependence of the relative SERS intensities on the electrode potential has been analyzed on the basis of ab initio calculations of the electronic properties of the isolated adsorbate in its ground and excited CT states (Bz -and Bz •2-, respectively). Moreover, configuration interaction singles (CIS) calculations have also been carried out for the Ag 2 -benzoate (Ag 2 -Bz -) supermolecule, which shows two excited singlets, namely CT 0 ; 1 B 1 and CT 1 ; 1 A 2 , where the properties of the adsorbate are quite similar to those of the radical dianion of the isolated species. The theoretical calculations predict the selective enhancement of modes 8a and ν s (CO 2 -) under CT resonant conditions in close agreement with the SERS results. This confirms once again the relevance of resonant CT processes in the SERS of aromatic molecules and the usefulness of this technique in the study of very unstable species such as radical anions or dianions of aromatic adsorbates.

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“…Compared with the spectrum of OLA-TiO 2 NRs, the double bands at 1506 and 1407 cm -1 are observed clearly in the FTIR spectrum of BA-TiO 2 NRs, which can be attributed to the coordination between benzoic acid and TiO 2 [30]. The strong bands at 1384 cm -1 are connected to the symmetric stretching band of the COOgroup in the benzoic acid [31]. No vibrating bands of -CH 2 -and CH 3 -groups can be observed, and that suggests oleic acid on the surface of TiO 2 NRs have been totally exchanged by the benzoic acid ligands.…”

Section: Surface Ligand Exchange Of Tio 2 Nrsmentioning

confidence: 86%

Enhancing the performance of dye-sensitized solar cells by benzoic acid modified TiO2 nanorod electrode

2012

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ChemInform Abstract: Relation Between SERS Intensity and Electronic Structures for a Series of Compounds C₆H₅(CH₂)_nCOOH (n: 0, 1, 2)

Cited by 3 publications

References 1 publication

Silver-doped sol-gel films as the substrate for surface-enhanced Raman scattering

Silver-doped sol-gel films as the substrate for surface-enhanced Raman scattering

Surface-Enhanced Raman Scattering of Benzoate Anion Adsorbed on Silver Nanoclusters: Evidence of the Transient Formation of the Radical Dianion

Enhancing the performance of dye-sensitized solar cells by benzoic acid modified TiO2 nanorod electrode

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