Modulation of Optical Properties of Gold Nanorods on Addition of KOH

Tiwari, Neha; Kalele, Suchita; Kulkarni, Sulabha K.

doi:10.1007/s11468-007-9043-x

Cited by 24 publications

(25 citation statements)

References 22 publications

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“…2 The above results are consist with previous studies. 21 However, the shape of the LLSPR spectra is no longer Gaussian when pH is larger than 5, and appears as a double-hump. 22 We speculate that rod-shaped gold nanoparticles might not be the sole product and nanoparticles with other shapes were also formed.…”

Section: Characterization Of Gnrsmentioning

confidence: 99%

“…Wang et al 14 obtained different shapes of gold nano-structures by varying the pH of the reaction medium with pre-synthesized GNRs acting as the seeds. Tiwari and coworkers 21 investigated the changes in the optical absorption spectra of GNRs when different amounts of KOH were added. The above two reports both emphasized that the reducing power of ascorbic acid (AA) at different pH was the significant parameter to affect the morphology of the products.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of pH Effect on Gold Nanorod Synthesis

Cheng¹,

Wang²,

Xiong³

et al. 2011

J Chinese Chemical Soc

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Gold nanorods (GNRs) are routinely prepared by the seed-mediated growth method under the assistant of surfactant CTAB and it is important to understand the factors that control the formation process of GNRs. Here we investigated systematically how the pH conditions contribute to the GNR morphology and size evolution with UV-Vis absorption spectrometry and TEM. It was found that the aspect ratio and morphology of GNRs are dependent on the pH of the growth solution. Moreover, the GNR growth pathway also varies at different pH. Our results indicated that pH affected CTAB micelle's stability and reduced its absorption ability on gold surface, which changes the gold atom deposition behavior onto the surface.

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Section: Characterization Of Gnrsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of pH Effect on Gold Nanorod Synthesis

Cheng¹,

Wang²,

Xiong³

et al. 2011

J Chinese Chemical Soc

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show abstract

“…The spectra showed the characteristic bands of AuNPs at 533 nm and 520 nm for the citrate‐reduced and borohydride‐reduced, respectively. This result is quite reasonable since it is commonly assumed that the plasmon absorption maximum depends on the size and shape of metal nanoparticles 14.…”

Section: Resultsmentioning

confidence: 55%

Electrochemical Behavior of Gold Nanoparticles Generated In Situ on 3‐(1‐Imidazolyl)propyl‐silsesquioxane

et al. 2013

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Gold nanoparticles of different morphologies have been synthesized on a silica‐based organic‐inorganic hybrid material for catalytic applications. The gold nanoparticles formations proceed through in situ chemical reduction of the AuCl4− anions previously adsorbed on 3‐(1‐imidazolyl)propyl‐silsesquioxane, which plays the role of substrate and stabilizer. Two distinct reducing agents, sodium citrate and sodium borohydride, were employed to generate gold nanoparticles of different sizes. UV‐vis diffuse reflectance as well as transmission electron microscopy were employed to evaluate the particle’s morphology. Modified carbon paste electrodes were prepared from these materials and their electrochemical behavior investigated using potassium ferrocyanide and 4‐nitrophenol as redox model compounds. Both AuNPs‐modified electrodes decreased the overpotential of 4‐nitrophenol reduction by around 90 mV compared to the unmodified electrode as evidenced by cyclic voltammetry experiment. However, the smaller diameter particles (borohydride‐reduced) produced more significant catalytic effect as a consequence of their large surface area. Regarding the sensing parameters, the sensitivity is higher for the borohydride‐reduced AuNPs while the values of limit of detection are of the same order of magnitude. Thus, the detection limit and sensitivity are 70.0±0.6 nM and 187 µA/mM for the citrate‐reduced AuNPs; and 75.0±2.2 nM and 238 µA/mM for the borohydride‐reduced AuNPs.

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“…This technique is found to be 100-fold more sensitive than conventional fluorescence-based assays, and the limit of detection is in the range of tens of femtomoles of the target analyte [50]. Recently, gold nanorods have been used for the detection of pH-related changes [51]. When a pH change occurs in the vicinity of nanorods, they undergo structural transformations from rods to dogbones or dumbbell, which can be monitored spectroscopically as a strong shift in the longitudinal plasmon resonance.…”

Section: Optical Sensorsmentioning

confidence: 99%

Plasmon-assisted photonics at the nanoscale

Kalele

2007

J. Nanophoton

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Plasmons are collective oscillations of electrons that have been exploited in many applications by manipulating and guiding light at resonant frequencies. The transition from understanding the origin and fundamentals of surface plasmon resonance to its many revolutionary applications has been intriguing. Advances in nanofabrication techniques over the last few years have led to variety of applications such as high-resolution plasmon printing, nanoscale waveguides, biodetection at the single-molecule level and enhanced transmission through sub-wavelength apertures, which are all examples of plasmon-assisted nanophotonics. Fundamental aspects of the surface plasmon resonance underlie enticing applications in nanophotonics.

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Modulation of Optical Properties of Gold Nanorods on Addition of KOH

Cited by 24 publications

References 22 publications

Investigation of pH Effect on Gold Nanorod Synthesis

Investigation of pH Effect on Gold Nanorod Synthesis

Electrochemical Behavior of Gold Nanoparticles Generated In Situ on 3‐(1‐Imidazolyl)propyl‐silsesquioxane

Plasmon-assisted photonics at the nanoscale

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