One-step wet chemical synthesis of gold nanoplates on solid substrate using poly-l-lysine as a reducing agent

Nafisah, Suratun; Morsin, Marlia; Jumadi, Nur Anida; Nayan, Nafarizal; Shah, Nur Zehan An’nisa Md; Razali, Nur Liyana; Salleh, Muhamad Mat

doi:10.1016/j.mex.2018.12.002

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…Previously, many attempts have been done to produce high yield of nanoplates by investigating the seeding process [ 35 ], growth aging period [ 17 ] and the materials, i.e. surfactants and capping agents used in the synthesis process [ 28 ] and also simplifying the process [ 36 ]. As a result, we found that the implementation of PLL in the synthesizing process successfully promotes high yield of Au nanoplates product especially for hexagon shapes.…”

Section: Introductionmentioning

confidence: 99%

The role of positively charge poly-L-lysine in the formation of high yield gold nanoplates on the surface for plasmonic sensing application

et al. 2021

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An anisotropic structure, gold (Au) nanoplates was synthesized using a two-step wet chemical seed mediated growth method (SMGM) directly on the substrate surface. Prior to the synthesis process, poly-l-lysine (PLL) as a cation polymer was used to enhance the yield of grown Au nanoplates. The electrostatic interaction of positive charged by PLL with negative charges from citrate-capped gold nanoseeds contributes to the yield increment. The percentage of PLL was varied from 0% to 10% to study the morphology of Au nanoplates in term of shape, size and surface density. 5% PLL with single layer treatment produce a variety of plate shapes such as hexagonal, flat rod and triangular obtained over the whole substrate surface with the estimated maximum yield up to ca. 48%. The high yield of Au nanoplates exhibit dual plasmonic peaks response that are associated with transverse and longitudinal localized surface plasmon resonance (TSPR and LSPR). Then, the PLL treatment process was repeated twice resulting the increment of Au nanoplates products to ca. 60%. The thin film Au nanoplates was further used as sensing materials in plasmonic sensor for detection of boric acid. The anisotropic Au nanoplates have four sensing parameters being monitored when the medium changes, which are peak position (wavelength shift), intensity of TSPR and LSPR, and the changes on sensing responses. The sensor responses are based on the interaction of light with dielectric properties from surrounding medium. The resonance effect produces by a collection of electron vibration on the Au nanoparticles surface after hit by light are captured as the responses. As a conclusion, it was found that the PLL treatment is capable to promote high yield of Au nanoplates. Moreover, the high yield of the Au nanoplates is an indication as excellent candidate for sensing material in plasmonic sensor.

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Section: Introductionmentioning

confidence: 99%

The role of positively charge poly-L-lysine in the formation of high yield gold nanoplates on the surface for plasmonic sensing application

et al. 2021

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“…14,41 Then, the GNPs on the substrate have been deposited using single-step procedure with the surface density in the range of 14.47% to 48.99%. 47 However, the absorption spectrum shows no strong surface plasmon resonance band observed at ultraviolet-visible (UV-Vis) and infrared region. Besides, process parameters effect such as growth time, 14 seeding time 32 and many others onto the formation of GNPs also been studied.…”

Section: Introductionmentioning

confidence: 99%

Formation of anisotropic gold nanoparticles on indium tin oxide substrates as a plasmonic sensing material

Razali

Morsin

Nafisah

et al. 2020

Nanomaterials and Nanotechnology

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A simple technique of seed-mediated growth has been successfully performed to grow anisotropy gold nanoparticles on solid substrates. The growth of the gold nanoparticles has been carried out in the presence of a binary surfactant mixture of hexadecyltrimethylammonium bromide with two different molecular weights of a capping agent, namely polyvinylpyrrolidone: 40,000 and 55,000. In this study, the effect of process parameters, growth time and molecular weight of capping agent was investigated. The growth time shows a significant impact on the shape and size of nanoparticles. The shorter growth time produced small spherical to square-like shape particles, whereas bigger particles including nanorods, nanosquares and nanotriangles were formed with longer growth time. The shape controlling agent, polyvinylpyrrolidone, was used to synthesis gold nanoparticles. It was found that monodisperse gold nanoparticles with uniform shape and size are hardly obtained when polyvinylpyrrolidone 40,000 was used as capping agent. Polyvinylpyrrolidone 55,000 produced more uniform shape and size of gold nanoparticles. Thus, these process parameters were found affected to the size, shape, surface density and uniformity of gold nanoparticles. This sample was further applied as a sensing material in the detection of toxic fungicide, namely chlorothalonil. The sensitivity of the sensor system was determined by the changes in peak positions and intensities of the transverse and longitudinal surface plasmon resonance peaks on different medium, that is, air, deionized water and chlorothalonil solution. The sensor response of gold nanoparticles thin film in 30 mM chlorothalonil showed two resonance peaks in comparison to the control experiment without gold nanoparticle thin film. The gold nanoparticles thin film sensor was successfully synthesized and potentially useful as a sensing material for fungicide detection.

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Effects of Growth Solutions Ageing Time to the Formation of Gold Nanorods via Two-Step Approach for Plasmonic Applications

et al. 2020

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One-step wet chemical synthesis of gold nanoplates on solid substrate using poly-l-lysine as a reducing agent

Abstract: Graphical abstract

Cited by 8 publications

References 11 publications

The role of positively charge poly-L-lysine in the formation of high yield gold nanoplates on the surface for plasmonic sensing application

The role of positively charge poly-L-lysine in the formation of high yield gold nanoplates on the surface for plasmonic sensing application

Formation of anisotropic gold nanoparticles on indium tin oxide substrates as a plasmonic sensing material

Effects of Growth Solutions Ageing Time to the Formation of Gold Nanorods via Two-Step Approach for Plasmonic Applications

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