Crystallite size determination of thermally deposited Gold Nanoparticles

Ogundare, O.; Akinribide, Ojo Jeremiah; Adetunji, A. R.; Adeoye, M. O.; Olubambi, Peter Apata

doi:10.1016/j.promfg.2019.02.025

Cited by 20 publications

(10 citation statements)

References 19 publications

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“…The XRD pattern of AuNRs with characteristic peaks of Au at 2θ = 38.1 • (111), 44.3 • (200), 64.5 • (220), and 77.7 • (311) in Figure 5a revealed high crystallinity of AuNRs, which is consistent with the TEM results [39]. Furthermore, the EDX spectra in Figure 5b represented that Au and Si are the major elements of AuNR-coated glass substrate, indicating successful coating of glass substrate with AuNRs.…”

Section: Growth Of Au Nanoseeds Into Aunrssupporting

confidence: 85%

Hydroquinone-Based Fabrication of Gold Nanorods with a High Aspect Ratio and LSPR Greater than 850 nm to Be Used as a Surface Plasmon Resonance Platform for Rapid Detection of Thiophanate Methyl

et al. 2020

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The use of gold nanorods (AuNRs) as surface-enhanced Raman scattering (SERS) substrates has gained much attraction due to their remarkably aspect-ratio-dependent plasmonic properties. In this report, we described the development of AuNRs with a high aspect ratio and longitudinal surface plasmon resonance (LSPR) >850 nm through a hydroquinone-based fabrication with minor modifications. The synthesis started with the reduction of chloroauric acid (HAuCl4) by sodium borohydride (NaBH4) to make gold nanoseeds from which AuNRs were grown with the aid of silver nitrate (AgNO3), HAuCl4, cetyltrimethylammonium bromide (CTAB), and hydroquinone (HQ). Scanning electron microscopy coupled with energy-dispersive X-ray (SEM-EDX), Transmission electron microscope (TEM), X-ray diffraction (XRD) and Ultra-violet-Visible spectroscopy (UV-Vis) were performed to study the shape, size, and structural and optical properties of AuNRs, respectively. The results showed that AuNRs with high aspect ratios (AR > 3) were single crystals with a heterogenous size distribution, and that the growth of Au nanoseeds into AuNRs took place along the [001] direction. AuNRs exhibited two plasmon resonance peaks at 520 nm and 903 nm, while gold nanoseeds had only a plasmon resonance peak at 521 nm. The as-synthesized AuNRs also showed SERS effects for thiophanate methyl, a broad-spectrum fungicide, with the limit of detection down to 5 mg/L of the fungicide. AuNR-coated glass can serve as a SERS-based sensing platform for rapid detection of thiophanate methyl with high sensitivity and reproducibility.

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Section: Growth Of Au Nanoseeds Into Aunrssupporting

confidence: 85%

Hydroquinone-Based Fabrication of Gold Nanorods with a High Aspect Ratio and LSPR Greater than 850 nm to Be Used as a Surface Plasmon Resonance Platform for Rapid Detection of Thiophanate Methyl

et al. 2020

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“…The as-prepared AuNP@rGO/PPyNT composite, four diffractions observed at 38.3, 44.4, 64.5, and 77.6°, which can be indexed as (111), (200), (220), and (311) planes of Au NP (JCPDS file no. 00-004-0784), respectively. , From the XRD peak (111), the volume-averaged particle size D was estimated by the well-known Scherer’s eq where D is the average size of the Au NP, λ κα , θ max , and B 2θ represent the X-ray wavelength (Cu Kα λ κα = 0.1541 nm, the maximum angle of the XRD peak, and the half-peak width for Au NP (111) in radians. According to the above eq , the Au NP particle size is 26.2 nm.…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle Embedded on a Reduced Graphene Oxide/polypyrrole Nanocomposite: Voltammetric Sensing of Furazolidone and Flutamide

et al. 2020

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A new electrochemical sensor has been constructed based on the in situ preparation of gold nanoparticle embedded on reduced graphene oxide and polypyrrole nanotube (AuNP@rGO/PPyNT) composite through a nanosecond laser-induced heating technique. The as-prepared composite is used for individual as well as the simultaneous electrochemical determination of chemotherapy drug (furazolidone, FU) and anticancer drug (flutamide, FLT). The composite was analyzed by X-ray Diffraction, scanning electron microscopy/energy-dispersive X-ray analysis, transmission electron microscopy, Raman spectrometry, and X-ray photoelectron spectroscopy analysis, thus confirming the successful synthesis of this composite and its physical features. The modified AuNP@rGO/PPyNT electrode was examined through cyclic voltammetry and differential pulse voltammetry (DPV) methods in pH 7.0 for the determination of FU and FLT in individual, simultaneous, and mixed systems. The fabricated sensor showed wide linear responses (0.01–1080.11 μM and 0.01–1214.11 μM) of analytes, with the lower limits of detection of 2.3 and 2.45 nM and higher sensitivity of 53.75 and 50.06 μA μM–1 cm–2, respectively. Furthermore, the constructed sensor demonstrates higher stability, reproducibility, and repeatability, and is effectively applied for the analysis of FU and FLT content in the human serum sample analysis with satisfactory recovery.

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“…As shown in Figure 6d,e, the glass substrate or AuNSps itself did not give any Raman signals of thiophanate methyl indicating thiophanate methyl-free surfaces. It should be noted that even though in the presence of thiophanate methyl, those signals could not be observed when the concentration [24]. No impurities were found in XRD spectra of AuNSp.…”

Section: Sers Measurementmentioning

confidence: 85%

“…The TEM images of AuNSps revealed monodisperse spherical nanostructures with the average diameter of 53.52 ± 0.36 nm (Figure 4c,d). [24]. No impurities were found in XRD spectra of AuNSp.…”

Section: Synthesis Of Aunspsmentioning

confidence: 87%

Potential Application of Gold Nanospheres as a Surface Plasmon Resonance Based Sensor for In-Situ Detection of Residual Fungicides

Nhat

Phong

Nguyen

et al. 2020

Sensors

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It is essential to develop a simple and sensitive method to rapidly detect residual fungicides in agricultural products to protect human health. So far, little studies have been reported on potential application of gold nanospheres (AuNSps) as a surface plasmon resonance based sensor for in-situ detection of residual fungicides. Therefore, in this study, we investigated the potential application of AuNSps as a surface plasmon resonance based sensor for in-situ detection of fungicides. AuNSps were successfully synthesized via a seed-mediated method with some modifications. Firstly, gold nanoseeds were made during the reduction of chloroauric acid by trisodium citrate dihydrate (TSC). Then, AuNSps were grown from the seeds by using HAuCl 4 , TSC and EDTA. AuNSps were subsequently dropped on a glass substrate before covered by thiophanate methyl, a broad-spectrum systemic fungicide. The AuNSps coated glass substrate was subsequently dried in the air for further surface-enhanced Raman spectroscopy (SERS) measurements. Optical properties, shape and size of AuNSps were confirmed by UV-vis spectroscopy, XRD, SEM-EDX and TEM. The results showed that AuNSps were successfully synthesized with the size of 53 nm, and their resonance peak was located at 560 nm. The Raman signal intensity of thiophanate methyl covered on AuNSps is higher than that without AuNSps, indicating SERS effects of AuNSps deposited glass substrate.

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Crystallite size determination of thermally deposited Gold Nanoparticles

Cited by 20 publications

References 19 publications

Hydroquinone-Based Fabrication of Gold Nanorods with a High Aspect Ratio and LSPR Greater than 850 nm to Be Used as a Surface Plasmon Resonance Platform for Rapid Detection of Thiophanate Methyl

Hydroquinone-Based Fabrication of Gold Nanorods with a High Aspect Ratio and LSPR Greater than 850 nm to Be Used as a Surface Plasmon Resonance Platform for Rapid Detection of Thiophanate Methyl

Gold Nanoparticle Embedded on a Reduced Graphene Oxide/polypyrrole Nanocomposite: Voltammetric Sensing of Furazolidone and Flutamide

Potential Application of Gold Nanospheres as a Surface Plasmon Resonance Based Sensor for In-Situ Detection of Residual Fungicides

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