Enhanced Raman spectrum of lawsone on Ag surface: Vibrational analyses, frequency shifts, and molecular geometry

Heo, Jin-Young; Cho, Chang-Ho; Jeon, Hye‐Seon; Cheong, Byeong‐Seo; Cho, Han‐Gook

doi:10.1016/j.saa.2011.08.057

Cited by 24 publications

(15 citation statements)

References 34 publications

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“…It has been used as hair and skin pigments for more than 5000 years. 41 Lawsone has a strong absorption in the near UV region. Structurally, lawsone molecule consists of benzene and quinone rings (naphthoquinone) with a hydroxyl group and has a planar structure (Cs symmetry).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and antimicrobial property of Fe3O4-Cys-HNQ nanocomplex, with l-cysteine molecule as a linker

Sangeetha

Philip

2013

RSC Adv.

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Lawsone, (2-hydroxy-1,4-naphthoquinone or HNQ), is known for its antimicrobial activity, corrosion inhibition and metal chelation properties. We describe here a simple methodology to functionalize Fe 3 O 4 nanoparticles with lawsone to produce Fe 3 O 4 -Cysteine-HNQ nanocomplex, using cysteine as a linker. The characterization of the nanocomplex is done using Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA), Dynamic Light Scattering size measurement, zeta potential and contact angle measurement. The zeta potential of uncoated nanoparticles and Fe 3 O 4 -Cysteine-HNQ nanocomplex is found to be +48 mV and 238 mV respectively. The reversal of surface charge from positive to negative corroborates the presence of lawsone monolayer at particle interface. Further, TGA result shows a weight loss of 32% for these nanocomplexes due to the decomposition of lawsone and cysteine present on the nanoparticles. The FTIR spectrum of the nanocomplex exhibits CLC and CLO stretching bands of lawsone, with a slight shift in their position, which confirms the interaction of lawsone with the cysteine coated nanoparticles. Fe 3 O 4 -Cysteine-HNQ nanocomplexes exhibit interesting properties such as increased wettability (contact angle y20u) on stainless steel substrate and antimicrobial activity against Staphylococcus aureus, with a minimum inhibitory concentration of 700 mg mL 21 . These results show that lawsone functionalized magnetite nanoparticles can be used as response stimulus antimicrobial agents.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and antimicrobial property of Fe3O4-Cys-HNQ nanocomplex, with l-cysteine molecule as a linker

Sangeetha

Philip

2013

RSC Adv.

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“…If C@C stretching vibrational mode strong in SERS, largely redshifted and undergoes band broadening, it is an indication of the compound to be adsorbed perpendicular to the Ag surface [33].…”

Section: Orientation Studiesmentioning

confidence: 99%

SERS investigations on orientation of 2-bromo-3-methyl-1,4-dimethoxy-9,10-anthraquinone on silver nanoparticles

Anuratha¹,

Jawahar²,

Umadevi

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Among the SERS substrates, the most popular ones for the analysis of samples containing organic colorants are at present chemically reduced silver colloids. In particular, colloids produced according to Lee and Meisel with sodium citrate as a reduction agent have been widely used in the field, although several authors proposed slight modifications to the original synthesis or suggested the addition of various aggregating agents such as potassium nitrate, sodium chloride, sodium perchlorate, and sodium sulfate . Conversely, the aggregation of silver nanoparticles (SNPs) in Lee and Meisel colloids may be achieved by concentrating the colloid through centrifugation and obtaining the so called ‘silver colloidal pastes’ that have been used as SERS substrates for the analysis of natural dyes in different matrices.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman scattering for the analysis of red lake pigments in painting layers mounted in cross sections

Idone

Aceto

Diana

et al. 2014

J Raman Spectroscopy

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Cross sections are very useful in the scientific investigation of paintings and polychromies as they show the sequence of the layers and allow the detection of colorants in each layer through micro‐Raman spectroscopy. Surface‐enhanced Raman scattering (SERS) presently represents the most promising tool to overcome the limits of a traditional micro‐Raman approach in the investigation of painting materials containing fluorescent organic dyes. Among the SERS substrates, silver colloidal pastes are suitable to analyze minute samples by drop‐coating them with the paste, without the need of specific pre‐treatments. The application of silver colloidal pastes has been explored here on two cross sections obtained from the 13th century painted wooden statue and from the 16th century mural painting. The main issue when employing such a substrate consists in achieving a suitable coating on the complex surfaces under investigation. In this work, some tests were devoted to enable the display of coated samples through the microscope coupled to the Raman spectrometer and to enhance the signals from lake pigments. The analytical procedure was successful in gaining SER spectra from the sections: the red, highly fluorescent pigment grains were identified as lake pigments obtained by kermes and by a purpurin‐rich plant dyestuff. SER signals were discussed by considering SER spectra obtained from pure substances and/or reference materials and data reported in the literature. The work represents a further step toward the possibility of fully exploiting the high spatial resolution of the micro‐Raman spectrometer to investigate samples from painted objects. Copyright © 2014 John Wiley & Sons, Ltd.

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Enhanced Raman spectrum of lawsone on Ag surface: Vibrational analyses, frequency shifts, and molecular geometry

Cited by 24 publications

References 34 publications

Synthesis, characterization and antimicrobial property of Fe3O4-Cys-HNQ nanocomplex, with l-cysteine molecule as a linker

Synthesis, characterization and antimicrobial property of Fe3O4-Cys-HNQ nanocomplex, with l-cysteine molecule as a linker

SERS investigations on orientation of 2-bromo-3-methyl-1,4-dimethoxy-9,10-anthraquinone on silver nanoparticles

Surface‐enhanced Raman scattering for the analysis of red lake pigments in painting layers mounted in cross sections

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