Large mesoporous carbons decorated with silver and gold nanoparticles by a self-assembly method: enhanced electrocatalytic activity for H2O2 electroreduction and sodium nitrite electrooxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2956-2962 ◽  
Author(s):  
X. J. Yang ◽  
Y. H. Wang ◽  
J. Bai ◽  
X. Y. He ◽  
X. E. Jiang
Keyword(s):  
Gold Nanoparticles ◽  
Sodium Nitrite ◽  
Self Assembly ◽  
Electrocatalytic Activity ◽  
Mesoporous Carbon ◽  
Mesoporous Carbons ◽  
Silver And Gold Nanoparticles ◽  
Assembly Method

The silver, gold nanoparticles were grown onto poly (diallyldimethyl ammoniumchloride, PDDA)-functionalized large mesoporous carbon (LMC) by simple self-assembly method. AuNPs or AgNPs/PDDA–LMC show superior electrocatalytic activity.

Fabrication of polypyrrole nanoplates decorated with silver and gold nanoparticles for sensor applications

RSC Advances ◽  
2015 ◽  
Vol 5 (85) ◽  
pp. 69745-69752 ◽  
Author(s):  
Junwei Ding ◽  
Kai Zhang ◽  
Gang Wei ◽  
Zhiqiang Su
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Electrocatalytic Activity ◽  
Assembly Process ◽  
Silver And Gold Nanoparticles ◽  
Sensor Applications

The PPyNPT–Ag and PPyNPT–Au nanohybrids fabricated by self-assembly process exhibit excellent electrocatalytic activity toward H2O2 and DA, respectively.

scholarly journals Electrodeposition–Assisted Assembled Multilayer Films of Gold Nanoparticles and Glucose Oxidase onto Polypyrrole-Reduced Graphene Oxide Matrix and Their Electrocatalytic Activity toward Glucose

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 993 ◽  
Author(s):  
Baoyan Wu ◽  
Shihua Hou ◽  
Yongyong Xue ◽  
Zhan Chen
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Electrocatalytic Activity ◽  
Multilayer Films ◽  
Glucose Biosensor ◽  
Future Design ◽  
Reduced Graphene

The study reports a facile and eco-friendly approach for nanomaterial synthesis and enzyme immobilization. A corresponding glucose biosensor was fabricated by immobilizing the gold nanoparticles (AuNPs) and glucose oxidase (GOD) multilayer films onto the polypyrrole (PPy)/reduced graphene oxide (RGO) modified glassy carbon electrode (GCE) via the electrodeposition and self-assembly. PPy and graphene oxide were first coated on the surface of a bare GCE by the electrodeposition. Then, AuNPs and GOD were alternately immobilized onto PPy-RGO/GCE electrode using the electrodeposition of AuNPs and self-assembly of GOD to obtain AuNPs-GOD multilayer films. The resulting PPy-RGO-(AuNPs-GOD)n/GCE biosensors were used to characterize and assess their electrocatalytic activity toward glucose using cyclic voltammetry and amperometry. The response current increased with the increased number of AuNPs-GOD layers, and the biosensor based on four layers of AuNPs-GOD showed the best performance. The PPy-RGO-(AuNPs-GOD)4/GCE electrode can detect glucose in a linear range from 0.2 mM to 8 mM with a good sensitivity of 0.89 μA/mM, and a detection limit of 5.6 μM (S/N = 3). This study presents a promising eco-friendly biosensor platform with advantages of electrodeposition and self-assembly, and would be helpful for the future design of more complex electrochemical detection systems.

Facile preparation protocol of magnetic mesoporous carbon acid catalysts via soft-template self-assembly method and their applications in conversion of xylose into furfural

2021 ◽  
Vol 379 (2209) ◽  
Author(s):  
P. Toumsri ◽  
W. Auppahad ◽  
S. Saknaphawuth ◽  
B. Pongtawornsakun ◽  
S. Kaowphong ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Carbon ◽  
Industrial Applications ◽  
Single Step ◽  
Advanced Materials ◽  
Soft Template ◽  
Assembly Method ◽  
Bet Specific Surface Area ◽  
Carbon Acid ◽  
Magnetic Mesoporous Carbon

Furfural is a valuable dehydration product of xylose. It has a broad spectrum of industrial applications. Various catalysts containing SO 3 H have been reported for the conversion of xylose into furfural. Nevertheless, the multi-step preparation is tedious, and the catalysts are usually fine powders that are difficult to separate from the suspension. Novel magnetic mesoporous carbonaceous materials (Fe/MC) were successfully prepared via facile self-assembly in a single step. A facile subsequent hydrothermal sulfonation of Fe/MC with concentrated H 2 SO 4 at 180°C gave mesoporous carbon bearing SO 3 H groups (SO 3 H@Fe/MC) without loss of the magnetic properties. Various techniques were employed to characterize the SO 3 H@Fe/MC as a candidate catalyst. It showed strong magnetism due to its Fe particles and possessed a 243 m 2  g −1 BET-specific surface area and a 90% mesopore volume. The sample contained 0.21 mmol g −1 of SO 3 H and gave a high conversion and an acceptable furfural yield and selectivity (100%, 45% and 45%, respectively) when used at 170°C for 1 h with γ-valerolactone as solvent. The catalyst was easily separated after the catalytic tests by using a magnet, confirming sufficient magneticstability. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 2)’.

scholarly journals Controllable synthesis of nitrogen-doped mesoporous carbons for supercapacitor applications

RSC Advances ◽  
2017 ◽  
Vol 7 (49) ◽  
pp. 30521-30532 ◽  
Author(s):  
Zhu Li ◽  
Kunkun Guo ◽  
Xuli Chen
Keyword(s):  
Current Density ◽  
Self Assembly ◽  
Solvent Evaporation ◽  
Mesoporous Carbons ◽  
Controllable Synthesis ◽  
Nitrogen Doped ◽  
Assembly Method ◽  
Evaporation Induced Self Assembly ◽  
Supercapacitor Applications

Nitrogen-doped mesoporous carbons have been controllably synthesized through a solvent evaporation induced self-assembly method. The carbons show 70% of the capacitor retained at current density of 50 A g−1 and no capacitance loss over 5000 cycles.

scholarly journals Selective Detection of Human Lung Adenocarcinoma Cells Based on the Aptamer-Conjugated Self-Assembled Monolayer of Gold Nanoparticles

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 195 ◽  
Author(s):  
Ngoc-Viet Nguyen ◽  
Chun-Ping Jen
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Human Lung ◽  
Specific Binding ◽  
Physical And Mechanical Properties ◽  
Target Cells ◽  
Self Assembled Monolayer ◽  
Assembly Method ◽  
Human Lung Adenocarcinoma Cells ◽  
Self Assembled

This study established a microfluidic chip for the capture of A549 human lung circulating tumor cells via the aptamer-conjugated self-assembled monolayer (SAM) of gold nanoparticles (AuNPs) in the channel. AuNPs are among the most attractive nanomaterials for the signal enhancement of biosensors owing to their unique chemical, physical, and mechanical properties. The microchip was fabricated using soft photolithography and casting and molding techniques. A self-assembly method was designed to attach AuNPs, cell-specific aptamers, and target cells onto the desired area (i.e., SAM area). In this study, the gold microelectrode configuration was characterized by fluorescence microscopy and impedance measurements to confirm the important modification steps. Subsequently, several investigations with the proposed assay were conducted with different cell samples to determine the specific binding ability of the device for A549 adenocarcinoma cancer cells. This work has ensured a simple, convenient, selective, and sensitive approach for the development of biosensors for lung cancer detection during the early stages.

scholarly journals Layer by Layer Assembled Chitosan-Coated Gold Nanoparticles for Enhanced siRNA Delivery and Silencing

2021 ◽  
Vol 22 (2) ◽  
pp. 831
Author(s):  
Elnaz Shaabani ◽  
Maryam Sharifiaghdam ◽  
Herlinde De Keersmaecker ◽  
Riet De Rycke ◽  
Stefaan De Smedt ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Fluorescent Protein ◽  
Transfection Efficiency ◽  
Direct Reduction ◽  
Sirna Delivery ◽  
Lung Epithelial Cells ◽  
Endosomal Escape ◽  
Layer By Layer ◽  
Assembly Method

Delivery of small interfering RNA (siRNA) provides one of the most powerful strategies for downregulation of therapeutic targets. Despite the widely explored capabilities of this strategy, intracellular delivery is hindered by a lack of carriers that have high stability, low toxicity and high transfection efficiency. Here we propose a layer by layer (LBL) self-assembly method to fabricate chitosan-coated gold nanoparticles (CS-AuNPs) as a more stable and efficient siRNA delivery system. Direct reduction of HAuCl4 in the presence of chitosan led to the formation of positively charged CS-AuNPs, which were subsequently modified with a layer of siRNA cargo molecules and a final chitosan layer to protect the siRNA and to have a net positive charge for good interaction with cells. Cytotoxicity, uptake, and downregulation of enhanced Green Fluorescent Protein (eGFP) in H1299-eGFP lung epithelial cells indicated that LBL-CS-AuNPs provided excellent protection of siRNA against enzymatic degradation, ensured good uptake in cells by endocytosis, facilitated endosomal escape of siRNA, and improved the overall silencing effect in comparison with commercial transfection reagents Lipofectamine and jetPEI®. Therefore, this work shows that LBL assembled CS-AuNPs are promising nanocarriers for enhanced intracellular siRNA delivery and silencing.

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