Synergistic interaction between gold nanoparticles and nickel phthalocyanine in layer-by-layer (LbL) films: evidence of constitutional dynamic chemistry (CDC)

2009 ◽  
Vol 11 (25) ◽  
pp. 5086 ◽  
Author(s):  
Wagner S. Alencar ◽  
Frank N. Crespilho ◽  
Marccus V. A. Martins ◽  
Valtencir Zucolotto ◽  
Osvaldo N. Oliveira, Jr ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Synergistic Interaction ◽  
Layer By Layer ◽  
Nickel Phthalocyanine ◽  
Lbl Films

scholarly journals Electronic Tongue Based on Nanostructured Hybrid Films of Gold Nanoparticles and Phthalocyanines for Milk Analysis

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Luiza A. Mercante ◽  
Vanessa P. Scagion ◽  
Adriana Pavinatto ◽  
Rafaela C. Sanfelice ◽  
Luiz H. C. Mattoso ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Chemical Sensors ◽  
Film Growth ◽  
Electronic Tongue ◽  
Principal Component ◽  
Inorganic Materials ◽  
Milk Analysis ◽  
Layer By Layer ◽  
Nanostructured Films ◽  
Lbl Films

The use of gold nanoparticles combined with other organic and inorganic materials for designing nanostructured films has demonstrated their versatility for various applications, including optoelectronic devices and chemical sensors. In this study, we reported the synthesis and characterization of gold nanoparticles stabilized with poly(allylamine hydrochloride) (Au@PAH NPs), as well as the capability of this material to form multilayer Layer-by-Layer (LbL) nanostructured films with metal tetrasulfonated phthalocyanines (MTsPc). Film growth was monitored by UV-Vis absorption spectroscopy, atomic force microscopy (AFM), and Fourier transform infrared spectroscopy (FTIR). Once LbL films have been applied as active layers in chemical sensors, Au@PAH/MTsPc and PAH/MTsPc LbL films were used in an electronic tongue system for milk analysis regarding fat content. The capacitance data were treated using Principal Component Analysis (PCA), revealing the role played by the gold nanoparticles on the LbL films electrical properties, enabling this kind of system to be used for analyzing complex matrices such as milk without any prior pretreatment.

Layer-by-layer assembly of hemoglobin and gold nanoparticles for enhancing the ability of oxygen carrying

2016 ◽  
Vol 363 ◽  
pp. 566-571 ◽  
Author(s):  
Lijun Sun ◽  
Xiaojun Liu ◽  
Qiaoling Sun ◽  
Meng Cai ◽  
Jiajing Zhou ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Layer Assembly

Selective Hydrogen Bonding Controls Temperature Response of Layer-by-Layer Upper Critical Solution Temperature Micellar Assemblies

Soft Matter ◽  
2021 ◽  
Author(s):  
Aliaksei Aliakseyeu ◽  
Victoria Albright ◽  
Danielle Yarbrough ◽  
Samantha Hernandez ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Methacrylic Acid ◽  
Temperature Response ◽  
Solution Temperature ◽  
Layer By Layer ◽  
Critical Solution Temperature ◽  
Hydrogen Bonding Interactions ◽  
Upper Critical Solution Temperature ◽  
Lbl Films

This work establishes a correlation between the selectivity of hydrogen-bonding interactions and the functionality of micelle-containing layer-by-layer (LbL) assemblies. Specifically, we explore LbL films formed by assembly of poly(methacrylic acid)...

scholarly journals Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 70
Author(s):  
Maria Raposo ◽  
Carlota Xavier ◽  
Catarina Monteiro ◽  
Susana Silva ◽  
Orlando Frazão ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Layer By Layer ◽  
Film Stability ◽  
A Value ◽  
Device Reliability ◽  
Sensor Devices ◽  
Lbl Films ◽  
The Stability

Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

scholarly journals Surface-Initiated Atom Transfer Polymerized Anionic Corona on Gold Nanoparticles for Anti-Cancer Therapy

Pharmaceutics ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 261
Author(s):  
Wei Mao ◽  
Sol Lee ◽  
Ji Un Shin ◽  
Hyuk Sang Yoo
Keyword(s):  
Gold Nanoparticles ◽  
Transfection Efficiency ◽  
Cancer Therapeutics ◽  
Atom Transfer ◽  
Layer By Layer ◽  
Dependent Manner ◽  
Metallic Particles ◽  
Anti Cancer

Surface initiated atom transfer radical polymerization (SI-ATRP) documented a simple but efficient technique to grow a dense polymer layer on any surface. Gold nanoparticles (AuNPs) give a broad surface to immobilize sulfhyryl group-containing initiators for SI-ATRP; in addition, AuNPs are the major nanoparticulate carriers for delivery of anti-cancer therapeutics, since they are biocompatible and bioinert. In this work, AuNPs with a disulfide initiator were polymerized with sulfoethyl methacrylate by SI-ATRP to decorate the particles with anionic corona, and branched polyethyeleneimine (PEI) and siRNA were sequentially layered onto the anionic corona of AuNP by electrostatic interaction. The in vitro anti-cancer effect confirmed that AuNP with anionic corona showed higher degrees of apoptosis as well as suppression of the oncogene expression in a siRNA dose-dependent manner. The in vivo study of tumor-bearing nude mice revealed that mice treated with c-Myc siRNA-incorporated AuNPs showed dramatically decreased tumor size in comparison to those with free siRNA for 4 weeks. Furthermore, histological examination and gene expression study revealed that the decorated AuNP significantly suppressed c-Myc expression. Thus, we envision that the layer-by-layer assembly on the anionic brushes can be potentially used to incorporate nucleic acids onto metallic particles with high transfection efficiency.

Fabrication of microelectrodes using flow layer-by-layer self assembly of gold nanoparticles

2012 ◽  
Vol 52 (5) ◽  
pp. 1043-1051 ◽  
Author(s):  
Panittamat Kumlangdudsana ◽  
Adisorn Tuantranont ◽  
Stephan Thierry Dubas ◽  
Luxsana Dubas
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Layer By Layer

Layer-by-layer self-assembly of 2D graphene nanosheets, 3D copper oxide nanoflowers and 0D gold nanoparticles for ultrasensitive electrochemical detection of alpha fetoprotein

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 56583-56589 ◽  
Author(s):  
Yulan Wang ◽  
Dan Wu ◽  
Yong Zhang ◽  
Xiang Ren ◽  
Yaoguang Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Copper Oxide ◽  
Electrochemical Detection ◽  
Self Assembly ◽  
Graphene Nanosheets ◽  
Electrochemical Immunosensor ◽  
Alpha Fetoprotein ◽  
Quantitative Detection ◽  
Layer By Layer ◽  
Label Free

In this work, a novel and ultrasensitive label-free electrochemical immunosensor was developed for the quantitative detection of alpha fetoprotein (AFP).

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