Assembled growth of 3D Fe3O4@Au nanoparticles for efficient photothermal ablation and SERS detection of microorganisms

2018 ◽  
Vol 6 (36) ◽  
pp. 5689-5697 ◽  
Author(s):  
Wei-En Hong ◽  
I-Ling Hsu ◽  
Szu-Yung Huang ◽  
Chien-Wei Lee ◽  
Han Ko ◽  
...  
Keyword(s):  
Antibacterial Agent ◽  
Au Nanoparticles ◽  
Sers Signal ◽  
Photothermal Ablation ◽  
Sers Detection

A leukocyte-like Fe3O4@Au-polydopamine nanohybrid performed a magnetism-based enhanced SERS signal and efficient NIR-irradiated photothermal antibacterial agent.

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).

Facile Surface Modification of Mesoporous Au Nanoparticles for Highly Sensitive SERS Detection

2020 ◽  
Vol 92 (23) ◽  
pp. 15379-15387
Author(s):  
Dongjie Zhang ◽  
Hongjun You ◽  
Lingling Zhang ◽  
Jixiang Fang
Keyword(s):  
Surface Modification ◽  
Au Nanoparticles ◽  
Highly Sensitive ◽  
Sers Detection

scholarly journals Microporous silica membranes promote plasmonic nanoparticle stability for SERS detection of uranyl

Nanoscale ◽  
2020 ◽  
Vol 12 (46) ◽  
pp. 23700-23708
Author(s):  
Hoa T. Phan ◽  
Shenghao Geng ◽  
Amanda J. Haes
Keyword(s):  
Ionic Strength ◽  
Au Nanoparticles ◽  
Microporous Silica ◽  
Silica Membranes ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Stability ◽  
Sers Detection ◽  
Sers Sensing

Microporous silica membranes facilitate plasmonic stability of Ag@Au nanoparticles against variations in pH, ionic strength, and temperature for SERS sensing.

Ascorbic Acid Functionalized Anti-Aggregated Au Nanoparticles for Ultrafast MEF and SERS Detection of Tartrazine: An Ultra-Wide Piecewise Linear Range Study

The Analyst ◽  
2022 ◽  
Author(s):  
Mengru Li ◽  
Ran Li ◽  
Bo Han ◽  
Haojie Ma ◽  
Xueyan Hou ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Au Nanoparticles ◽  
Piecewise Linear ◽  
Linear Range ◽  
Food Colorant ◽  
Sers Detection ◽  
Excessive Intake ◽  
Range Study

Tartrazine, as a synthetic food colorant, is harmful to health upon excessive intake. In this work, we developed a simple, sensitive and ultrafast method to detect tartrazine effectively. Specifically, we...

scholarly journals Chitosan-Capped Au Nanoparticles for Laser Photothermal Ablation Therapy: UV-Vis Characterization and Optothermal Performances

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Giancarlo Margheri ◽  
Silvana Trigari ◽  
Mariabeatrice Berti ◽  
Maurizio Muniz Miranda ◽  
Rita Traversi
Keyword(s):  
Near Infrared ◽  
Au Nanoparticles ◽  
Ablation Therapy ◽  
Synthesis Conditions ◽  
Photothermal Ablation ◽  
Nir Absorption ◽  
One Step ◽  
The One ◽  
Refined Version

We have reported on the synthesis and characterization of near-infrared- (NIR-) absorbing colloidal nanoparticles prepared by exploiting the one-step reaction of HAuCl4 and Na2S2O3, followed by their stabilization with chitosan. This reaction also produces a big amount of unwanted nanoparticles detuned with respect to the NIR spectral region. For this reason, it is usually assumed that the product has to be filtered and enriched to enhance its NIR absorption, and the possible exploitation of the simpler raw product has never been worthy to be considered. Aiming to investigate this missing aspect, we chose to avoid the purification steps and rather focused on the preparation of the unrefined colloid, identifying the synthesis conditions that maximize its NIR absorbance and, subsequently, testing it as an optothermal transducer by measuring its molar heating rate (MHR). As expected, we found that the performances of the raw colloid are indeed lower than those of its refined version, but only to a limited extent. Moreover, MHR is unexpectedly higher than that deducible for other classical NIR-absorbing nanoparticles, like Au nanorods or Au nanostars. Thus, the product of the simpler preparation protocol appears as a competitive trade-off solution between easy manufacturing and optothermal performances.

Plasmonic coupling of dual gold nanoprobes for SERS imaging of sialic acids on living cells

2016 ◽  
Vol 52 (70) ◽  
pp. 10640-10643 ◽  
Author(s):  
Wanyao Song ◽  
Lin Ding ◽  
Yunlong Chen ◽  
Huangxian Ju
Keyword(s):  
Au Nanoparticles ◽  
Living Cells ◽  
Sialic Acids ◽  
Plasmonic Coupling ◽  
Sers Signal ◽  
Sers Imaging

A single-core–multi-satellite nanostructure was designed by the recognition of target sialic acids and the assembly of functional Au nanoparticles into a Au nanoflower-based probe, which leads to plasmonic coupling of two kinds of Au nanoprobes to produce a sensitive SERS signal for the imaging of sialic acids on living cells.

Highly active Au NP microarray films for direct SERS detection

2019 ◽  
Vol 7 (48) ◽  
pp. 15259-15268 ◽  
Author(s):  
Lingling Zhang ◽  
Xiaodie Li ◽  
Weihua Liu ◽  
Rui Hao ◽  
Hongrui Jia ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Au Nanoparticles ◽  
Three Dimensional ◽  
Pdms Film ◽  
Highly Active ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering

In this study, we demonstrated a flexible transparent three-dimensional (3D) ordered micro-hemisphere (MHS) array PDMS film with self-assembled Au nanoparticles (NPs) (an Au NP-MHS array film) as a surface-enhanced Raman scattering (SERS) platform for the in situ detection of pesticides in food.

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