scholarly journals Preparation of polymer gold nanoparticle composites with tunable plasmon coupling and their application as SERS substrates

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 19884-19894 ◽  
Author(s):  
Samir A. Belhout ◽  
Frederico R. Baptista ◽  
Stephen J. Devereux ◽  
Anthony W. Parker ◽  
Andrew D. Ward ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Optical Tweezer ◽  
Plasmon Coupling ◽  
Sers Substrates ◽  
Nanoparticle Composites ◽  
Composite Properties ◽  
Properties Of Composites ◽  
Plasmon Ruler

The plasmonic properties of composites with controlled AuNP loading are found to be well described by a plasmon ruler equation, and Raman optical tweezer results show the SERS performance in the bulk is dominated by the discrete composite properties.

scholarly journals Facile Detection and Quantification of Acetamiprid Using a Portable Raman Spectrometer Combined with Self-Assembled Gold Nanoparticle Array

Chemosensors ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 327
Author(s):  
Panxue Wang ◽  
Yan Sun ◽  
Li Wang ◽  
Xiang Li ◽  
Miaomiao Liu ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Correlation Coefficients ◽  
Nanoparticle Array ◽  
Sers Signal ◽  
Sers Substrates ◽  
Specificity And Sensitivity ◽  
Exciting Opportunity ◽  
Sers Detection ◽  
Self Assembled ◽  
Detection And Quantification

Rapid and facile determination of pesticides is critically important in food and environmental monitoring. This study developed a self-assembled gold nanoparticle array based SERS method for highly specific and sensitive detection of acetamiprid, a neonicotinoid pesticide that used to be difficult in SERS analysis due to its low affinity with SERS substrates. SERS detection and quantification of acetamiprid was conducted with self-assembled gold nanoparticle arrays at the interface of chloroform and water as the enhancing substrate. Since targets dissolved in chloroform (organic phase) also have access to the hot-spots of Au NP array, the developed method exhibited good sensitivity and specificity for acetamiprid determination. Under the optimal conditions, SERS intensities at Raman shifts of 631 cm−1 and 1109 cm−1 displayed a good linear relationship with the logarithm concentration of acetamiprid in the range of 5.0 × 10−7 to 1.0 × 10−4 mol/L (0.11335 ppm to 22.67 ppm), with correlation coefficients of 0.97972 and 0.97552, respectively. The calculated LOD and LOQ of this method were 1.19 × 10−7 mol/L (0.265 ppb) and 2.63 × 10−7 mol/L (0.586 ppb), respectively, using SERS signal at 631 cm−1, and 2.95 × 10−7 mol/L (0.657 ppb) and 3.86 × 10−7 mol/L (0.860 ppb) using SERS signal at 1109 cm−1, respectively. Furthermore, the developed SERS method was successfully applied in determining acetamiprid on the surface of apple and spinach. This method offers an exciting opportunity for rapid detection of acetamiprid and other organic pesticides considering its advantages of simple preparation process, good specificity and sensitivity, and short detection time (within 1 h).

Collective Plasmon Coupling in Gold Nanoparticle Clusters for Highly Efficient Photothermal Therapy

ACS Nano ◽  
2022 ◽  
Author(s):  
Jinxing Chen ◽  
Mingfu Gong ◽  
Yulong Fan ◽  
Ji Feng ◽  
Lili Han ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Photothermal Therapy ◽  
Plasmon Coupling ◽  
Highly Efficient ◽  
Nanoparticle Clusters

scholarly journals Fully Printed Flexible Chemiresistors with Tunable Selectivity Based on Gold Nanoparticle Composites

Proceedings ◽  
2020 ◽  
Vol 56 (1) ◽  
pp. 15
Author(s):  
Bendix Ketelsen ◽  
Patrick P. Tjarks ◽  
Ying-Chih Liao ◽  
Tobias Vossmeyer
Keyword(s):  
Gold Nanoparticle ◽  
Composite Nanomaterials ◽  
Functional Composite ◽  
Nanoparticle Composites

Functional composite nanomaterials are promising candidates for the fabrication of wearable, flexible chemiresistive sensors which can be used [...]

Sem and Tem Studies of NiAl2O4 Spinel Phase Distribution in Alumina Matrix

2013 ◽  
Vol 58 (2) ◽  
pp. 501-504 ◽  
Author(s):  
K. Konopka ◽  
L. Litynska-Dobrzynska ◽  
J. Dutkiewicz
Keyword(s):  
Fracture Toughness ◽  
Phase Distribution ◽  
Spinel Phase ◽  
Metal Particles ◽  
Alumina Matrix ◽  
Sem And Tem ◽  
Alumina Matrix Composite ◽  
Composite Properties ◽  
Almost Continuous ◽  
Properties Of Composites

Methods of enhancing of mechanical properties of ceramic-metal composites, particularly fracture toughness by introducing dispersed metal particles such as W, Mo, Ni, Al, etc to a ceramic matrix are well known. However, the dependence of the microstructures, especially interfaces, on the properties of composites is not well understood yet. Moreover, the ceramic-metal interfaces play a crucial role in tailoring the composite properties. In this paper we examine the alumina matrix composite with NiAl2O4 spinel phase and present the SEM and TEM studies of spinel distribution, size and crystallographic orientation. The composites were prepared by sintering Al2O3 and Ni powders below the melting point of Ni in argon. During the process of sintering the spinel phase appeared. It was not homogeneously distributed in the alumina matrix. The spinel phase areas were linked together and constituted an almost continuous form. We observed that the distribution and size of spinel influenced the fracture toughness of the composite.

Gold Nanoparticle Cluster Arrays for High-Performance SERS Substrates Fabricated by Electro-oxidative Lithography

ChemNanoMat ◽  
2016 ◽  
Vol 2 (8) ◽  
pp. 781-785 ◽  
Author(s):  
He Liu ◽  
Almut M. Schwenke ◽  
Florian Kretschmer ◽  
Stephanie Hoeppener ◽  
Ulrich S. Schubert
Keyword(s):  
Gold Nanoparticle ◽  
High Performance ◽  
Sers Substrates ◽  
Nanoparticle Cluster
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