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

Shah, Nur Zehan An’nisa Md; Morsin, Marlia; Sanudin, Rahmat; Razali, Nur Liyana; Nafisah, Suratun; Soon, Chin Fhong

doi:10.1007/s11468-019-01098-2

Cited by 11 publications

(7 citation statements)

References 46 publications

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“…A plasmon is a collective oscillation of free electrons on the metal surface due to the interaction of electrons when hit by the electromagnetic light. Until now, we have successfully synthesized anisotropic Au such as nanorods [ 24 , 25 , 31 ], nanorices [ 32 ], nanomesh [ 33 ], and nanobipyramids [ 26 , 27 , 34 ]. All of these structures have been produced in different sizes and densities in solution form.…”

Section: Introductionmentioning

confidence: 99%

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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%

“…Currently, our group have been working with AuNPs specifically in sensing application [24][25][26][27][28]. The basis of this study started with Au nanosphericals and then further expanded by producing anisotropic nanostructures to enhance and expand the scope of applications.…”

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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“…There are two approaches in fabricating gold nanostructures: physical [27][28][29][30] and chemical approaches. 7,[31][32][33] Examples of the physical method are lithography, thermal evaporation and evaporation-condensation method. The evaporation-condensation method is implemented for not only gold but also other metal such as silver, palladium and fullerene.…”

Section: Introductionmentioning

confidence: 99%

“…Anisotropic GNPs such as nanorods, 31,38 nanorices 39 and nanobipyramids 40 are colloidal NPs that, due to their difficulty in attaching onto the substrate surface, are synthesized typically as solutions. Although these colloidal GNPs have dual-band responses, maintaining their stability is crucial since they are in solution form.…”

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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“…Freshly prepared growth solution has been used for all the measurements as aging of growth solution affect the results. The aging of solutions can affect the colour, intensity and plasmon resonance peak of the nanoparticles[36].Both the seed and growth solutions have been kept for 10 minutes with magnetic stirrer on before the synthesis of gold nanorods for the proper mixing of the individual components in the solution. To initiate the growth of gold nanorods, the seed solution was added to the growth solution at 25 ºC.…”

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Understanding blue shift of the longitudinal surface plasmon resonance during growth of gold nanorods

et al. 2021

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We have investigated in detail the growth dynamics of gold nanorods with various aspect ratios in different surrounding environments. Surprisingly, a blue shift in the temporal evolution of colloidal gold nanorods in aqueous medium has been observed during the growth of nanorods by UV-visible absorption spectroscopy. The longitudinal surface plasmon resonance peak evolves as soon as the nanorods start to grow from spheres, and the system undergoes a blue shift in the absorption spectra. Although a red-shift is expected as a natural phenomenon during the growth process of all nano-systems, our blue shift observation is regarded as a consequence of competition between the parameters of growth solution and actual growth of nanorods. The growth of nanorods contributes to the red-shift which is hidden under the dominating contribution of the growth solution responsible for the observed massive blue shift. Supplementary material for this article is available.

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

Cited by 11 publications

References 46 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

Understanding blue shift of the longitudinal surface plasmon resonance during growth of gold nanorods

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