Phase-transfer and film formation of silver nanoparticles

Sarkar, Anjana; Chadha, Ridhima; Biswas, Nandita; Mukherjee, Tulsi; Kapoor, Sudhir

doi:10.1016/j.jcis.2008.12.059

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…[12][13][14] Thus, surfactants have been used successfully to improve the limits of detection of various analytes through a mechanism involving "synergistic adsorption", i.e., the possibility of improving the analyte adsorption on the electrode surface due to the presence of a surfactant lm, facilitating the electron transfer between analytes and the electrode. 15 Additionally, surfactants allow the immobilization of biomolecules or bio-inspired molecules through the formation of multiple surfactant layers which entrap biomolecules on the electrode surface. 15 This strategy provides excellent stabilization and immobilization of natural or mimetic enzymes, thus providing a longer biosensor lifetime.…”

Section: Introductionmentioning

confidence: 99%

“…15 Additionally, surfactants allow the immobilization of biomolecules or bio-inspired molecules through the formation of multiple surfactant layers which entrap biomolecules on the electrode surface. 15 This strategy provides excellent stabilization and immobilization of natural or mimetic enzymes, thus providing a longer biosensor lifetime. 16 The bio-inspired concept comes from the observation of molecules and architecture inspired by biological models.…”

Section: Introductionmentioning

confidence: 99%

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A bio-inspired sensor based on surfactant film and Pd nanoparticles

Zapp

Souza

et al. 2013

Analyst

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A bio-inspired complex, [(bpbpmp)Fe(III)(m-OAc)(2)Cu(II)](ClO(4)), was combined with a zwitterionic surfactant (ImS3-14) stabilizing pre-formed palladium nanoparticles and coated on a glassy carbon electrode (GCE). This bio-inspired surfactant film was capable of catalyzing redox reactions of dihydroxybenzenes, thus allowing the simultaneous electrochemical quantification of CC and HQ in cigarette residue samples by square-wave voltammetry (SWV). The best experimental conditions were obtained using phosphate buffer solution (0.1 mol L(-1), pH 7.0), with 1.3 nmol of the bio-inspired complex, 0.15 μmol of the surfactant and 1.08 nmol of Pd. The best voltammetric parameters were: frequency 100 Hz, pulse amplitude 40 mV and step potential 8 mV. The limits of detection calculated from simultaneous curves were found to be 2.2 × 10(-7) and 2.1 × 10(-7) mol L(-1) for HQ and CC respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A bio-inspired sensor based on surfactant film and Pd nanoparticles

Zapp

Souza

et al. 2013

Analyst

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“…The clean glass slides were dipped in 5 × 10 –2 mol L −1 solution of AgNO 3 in formamide for two and half hours. Formamide reduces Ag + ions to Ag 0 and the nanoparticles (NPs) formed get deposited onto the glass slides resulting in the formation of stable nanostructured SCFs ( Sarkar et al, 2005 ; Sarkar et al, 2009 ; Maiti et al, 2013 ). MCH + /MC functionalized SCFs were prepared by dipping the nanostructured SCFs in acetonitrile solutions of varying concentrations of MCH + /MC for 15 min.…”

Section: Methodsmentioning

confidence: 99%

Conformational Selectivity of Merocyanine on Nanostructured Silver Films: Surface Enhanced Resonance Raman Scattering (SERRS) and Density Functional Theoretical (DFT) Study

et al. 2022

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In this study, detailed structural and vibrational analysis of merocyanine has been investigated using Raman, surface enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS). The Raman, SERS and SERRS studies aided by density functional theoretical (DFT) calculations clearly established the prevalence of the trans- and cis-conformers of the protonated form of merocyanine (MCH+) in solid and acetonitrile solution. The binding characteristics of merocyanine adsorbed on nanostructured silver-coated films (SCFs) were investigated using excitation-dependent SERS, concentration-dependent SERRS and DFT studies. The conformers of merocyanine involved in the surface adsorption processes were recognized. The prominent marker bands observed at 1538 (ethylenic C=C stretch) and 1133 cm−1 (pyridinium C-N stretch) in the Raman spectrum of merocyanine in acetonitrile shifted to 1540 and 1126 cm−1, respectively on the nanostructured SCFs. The shift in the marker bands is associated with either the preferential binding of selective conformer or change in resonance equilibrium between the benzenoid and quinoid forms. The excitation wavelength dependent SERS spectrum infers that in addition to the major contribution from the electromagnetic enhancement, chemical (resonance) effect leads to the amplification of the 1540 cm−1 band. The concentration-dependent SERRS study showed maximum enhancement for the nanostructured SCFs functionalized with 1 μM concentration of merocyanine, indicative of monolayer coverage. For lower concentrations of merocyanine, the SERRS signal intensity reduced without any alteration in the peak positions. The SERRS study thus, revealed sub-nanomolar (0.1 nM) sensing of merocyanine using nanostructured SCFs with the analytical enhancement factor (AEF) of ∼ 1010 for the 1126 cm−1 and 1540 cm−1 Raman bands for MC concentration of 0.1 nM. In this study, combination of SERRS and DFT have clearly established the predominance of trans-MCH+ on the nanostructured silver surface with minor contribution from cis-MCH+, which remain exclusively bound to the surface via the phenoxyl ring O atom. This conformational surface selectivity of geometrical isomers of merocyanine using nanostructured surfaces can be further explored for energy efficient and economical separation of geometrical isomers.

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“…It can also enhance the absorption of solar energy. Silver nanoparticles can be prepared through various methods including thermal evaporation [1], laser ablation [2], electromagnetic levitation gas condensation [3], radio-frequency sputtering [4], chemical reaction [5], phase transformation [6], self-assembly [7], and plasma electrochemical reduction [8]. Traditional electrodeposition as a relatively simple approach was also used to make silver nanoparticles [9,10].…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticle Formation on Metal Substrate Under Concentration-Limited Condition

Gan

Tavares

Gonzaga

et al. 2016

Journal of Micro and Nano-Manufacturing

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Silver nanoparticles were electrodeposited from 0.3 M oxalic acid electrolyte on a pure aluminum working electrode under silver ion concentration-limited condition. A silver wire was held in a glass tube containing 1.0 M KCl solution as the counter electrode. Ion exchange between the glass tube and the main electrodeposition bath through a capillary was driven by the overpotentials as high as 10 V supplied by an electrochemical workstation. Due to the reaction between chlorine anion and silver cation to form AgCl solid at the Ag/AgCl electrode, the silver ion concentration-limited condition holds in the electrolyte. It is found that silver grows at the aluminum working electrode to form nanoparticles with an average size of about 52.4 ± 13.6 nm. With the increasing of the deposition time, the silver nanoparticles aggregate into clusters. The silver particle clusters are separated with approximately 112.6 ± 19.7 nm due to the hydrogen bubble-induced self-assembling, which is shown by the confined deposition of silver on a gold coating. The surface roughness of the aluminum substrate leads to the reduced uniformity of silver nanoparticle nucleation and growth.

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Phase-transfer and film formation of silver nanoparticles

Cited by 12 publications

References 48 publications

A bio-inspired sensor based on surfactant film and Pd nanoparticles

A bio-inspired sensor based on surfactant film and Pd nanoparticles

Conformational Selectivity of Merocyanine on Nanostructured Silver Films: Surface Enhanced Resonance Raman Scattering (SERRS) and Density Functional Theoretical (DFT) Study

Silver Nanoparticle Formation on Metal Substrate Under Concentration-Limited Condition

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