Gold Nanoparticle Aggregate Morphology with Controllable Interparticle Spacing Prepared by a Polyelectrolyte Network Template

2008 ◽  
Vol 61 (1) ◽  
pp. 1 ◽  
Author(s):  
Feng Zhao ◽  
Jing Kun Xun ◽  
Shu Feng Liu
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
Large Scale ◽  
Polymer Network ◽  
Resonance Wavelength ◽  
Interparticle Spacing ◽  
Excitation Wavelength ◽  
Mica Surface ◽  
Simple Method ◽  
Nanostructured Gold

Gold nanoparticle self-assembly behaviour on a mica surface was investigated. A large-scale modified partially hydrated polyacrylamide network on a mica surface was successfully fabricated with a simple method. Gold nanoparticles were self-assembled onto a two-dimensional polymer network template by electrostatic interaction, and an interesting nanostructured gold morphology with controllable interparticle spacing was formed on the mica surface. By adjusting the gold aqueous concentrations, the particle distance could be optimized to approach strongest coupling between adjacent particles and match the plasmon resonance wavelength to the laser excitation wavelength. Thus, the spacing between nanoparticles could be controlled for tunable surface-enhanced Raman scattering substrates for optimal signal amplification.

scholarly journals Large-scale, power-efficient Au/VO2 active metasurfaces for ultrafast optical modulation

Nanophotonics ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 909-918
Author(s):  
Tongtong Kang ◽  
Zongwei Ma ◽  
Jun Qin ◽  
Zheng Peng ◽  
Weihao Yang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Power Efficiency ◽  
High Performance ◽  
Optical Switching ◽  
Large Scale ◽  
Colloidal Crystal ◽  
Resonance Wavelength ◽  
Optical Modulation ◽  
Power Efficient ◽  
Ultrafast Optical

AbstractActive metasurfaces, in which the optical property of a metasurface device can be controlled by external stimuli, have attracted great research interest recently. For optical switching and modulation applications, high-performance active metasurfaces need to show high transparency, high power efficiency, as well as ultrafast switching and large-scale fabrication capability. This paper reports Au/VO2-based active metasurfaces meeting the requirements above. Centimeter-scale Au/VO2 metasurfaces are fabricated by polystyrene sphere colloidal crystal self-assembly. The devices show optical modulation on-off ratio up to 12.7 dB and insertion loss down to 3.3 dB at 2200 nm wavelength in the static heating experiment, and ΔT/T of 10% in ultrafast pump-probe experiments. In particular, by judiciously aligning the surface plasmon resonance wavelength to the pump wavelength of the femtosecond laser, the enhanced electric field at 800 nm is capable to switch off the extraordinary optical transmission effect at 2200 nm in 100 fs time scale. Compared to VO2 thin-film samples, the devices also show 50% power reduction for all-optical modulation. Our work provides a practical way to fabricate large-scale and power-efficient active metasurfaces for ultrafast optical modulation.

Tuning Gold Nanoparticle Size with Fixed Interparticle Spacing in Large-Scale Arrays: Implications for Plasmonics and Nanoparticle Etching Masks

2021 ◽  
Vol 4 (3) ◽  
pp. 2733-2742
Author(s):  
Nathan J. Ray ◽  
Jae-Hyuck Yoo ◽  
Salmaan Baxamusa ◽  
Hoang T. Nguyen ◽  
Selim Elhadj ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Large Scale ◽  
Interparticle Spacing ◽  
Nanoparticle Size

scholarly journals Self-assembly of large-scale gold nanoparticle arrays and their application in SERS

2014 ◽  
Vol 9 (1) ◽  
pp. 114 ◽  
Author(s):  
Sheng-Qing Zhu ◽  
Tong Zhang ◽  
Xin-Li Guo ◽  
Xiao-Yang Zhang
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
Large Scale ◽  
Nanoparticle Arrays

PROTOTIPE APLIKASI PENYIRAMAN TANAMAN MENGGUNAKAN SENSOR KELEMBABAN TANAH BERBASIS MICRO CONTOLLER ATMEGA 328

2019 ◽  
Vol 5 (1) ◽  
pp. 97-106
Author(s):  
Rudi Budi Agung ◽  
Muhammad Nur ◽  
Didi Sukayadi
Keyword(s):  
Soil Moisture ◽  
Growth And Development ◽  
Large Scale ◽  
Simple Method ◽  
Moisture Sensor ◽  
Sensor Development ◽  
Soil Moisture Sensor ◽  
Application Systems ◽  
Harvesting Systems ◽  
Working Principle

The Indonesian country which is famous for its tropical climate has now experienced a shift in two seasons (dry season and rainy season). This has an impact on cropping and harvesting systems among farmers. In large scale this is very influential considering that farmers in Indonesia are stilldependent on rainfall which results in soil moisture. Some types of plants that are very dependent on soil moisture will greatly require rainfall or water for growth and development. Through this research, researchers tried to make a prototype application for watering plants using ATMEGA328 microcontroller based soil moisture sensor. Development of application systems using the prototype method as a simple method which is the first step and can be developed again for large scale. The working principle of this prototype is simply that when soil moisture reaches a certainthreshold (above 56%) then the system will work by activating the watering system, if it is below 56% the system does not work or in other words soil moisture is considered sufficient for certain plant needs.

A Novel Technique for Large-Scale Fabrication of 3D Colloidal Crystals: Suspending Self-Assembly in Water Medium (SSAM)

2021 ◽  
Author(s):  
Zhengting Zhang ◽  
Guiyun Yi ◽  
Xiaodong Wang ◽  
Peng Li ◽  
Zhuoyan Wan ◽  
...  
Keyword(s):  
Self Assembly ◽  
Large Scale ◽  
Colloidal Crystals ◽  
Water Medium ◽  
Novel Technique

Fluorescence biosensor for Salmonella typhimurium detection in food based on nano-self-assembly of alendronic acid modified upconversion and gold nanoparticles

2021 ◽  
Author(s):  
Min Chen ◽  
Leiqing Pan ◽  
K. Tu
Keyword(s):  
Gold Nanoparticles ◽  
Salmonella Typhimurium ◽  
Gold Nanoparticle ◽  
Alendronic Acid ◽  
Self Assembly ◽  
Upconversion Nanoparticles ◽  
Fluorescent Biosensor ◽  
Fluorescence Biosensor

A simple and quick responsive fluorescent biosensor for Salmonella typhimurium detection based on the recognition of aptamer coupled with alendronic acid (ADA)@upconversion nanoparticles (UCNPs) and gold nanoparticle (AuNPs) has been...

scholarly journals Kinked Bisamides as Efficient Supramolecular Foam Cell Nucleating Agents for Low-Density Polystyrene Foams with Homogeneous Microcellular Morphology

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1094
Author(s):  
Bastian Klose ◽  
Daniel Kremer ◽  
Merve Aksit ◽  
Kasper P. van der Zwan ◽  
Klaus Kreger ◽  
...  
Keyword(s):  
Cell Size ◽  
Self Assembly ◽  
Large Scale ◽  
Elevated Temperatures ◽  
Foam Cell ◽  
Cell Structure ◽  
Expansion Ratio ◽  
Low Density ◽  
Nucleating Agents ◽  
Foam Density

Polystyrene foams have become more and more important owing to their lightweight potential and their insulation properties. Progress in this field is expected to be realized by foams featuring a microcellular morphology. However, large-scale processing of low-density foams with a closed-cell structure and volume expansion ratio of larger than 10, exhibiting a homogenous morphology with a mean cell size of approximately 10 µm, remains challenging. Here, we report on a series of 4,4′-diphenylmethane substituted bisamides, which we refer to as kinked bisamides, acting as efficient supramolecular foam cell nucleating agents for polystyrene. Self-assembly experiments from solution showed that these bisamides form supramolecular fibrillary or ribbon-like nanoobjects. These kinked bisamides can be dissolved at elevated temperatures in a large concentration range, forming dispersed nano-objects upon cooling. Batch foaming experiments using 1.0 wt.% of a selected kinked bisamide revealed that the mean cell size can be as low as 3.5 µm. To demonstrate the applicability of kinked bisamides in a high-throughput continuous foam process, we performed foam extrusion. Using 0.5 wt.% of a kinked bisamide yielded polymer foams with a foam density of 71 kg/m3 and a homogeneous microcellular morphology with cell sizes of ≈10 µm, which is two orders of magnitude lower compared to the neat polystyrene reference foam with a comparable foam density.

Free-Standing Gold-Nanoparticle Monolayer Film Fabricated by Protein Self-Assembly of α-Synuclein

2015 ◽  
Vol 127 (15) ◽  
pp. 4654-4659 ◽  
Author(s):  
Junghee Lee ◽  
Ghibom Bhak ◽  
Ji-Hye Lee ◽  
Woohyun Park ◽  
Minwoo Lee ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
Monolayer Film ◽  
Free Standing

Self-assembly of sodium and potassium betulinates into hydro- and organo-gels: entrapment and removal studies of fluorophores and synthesis of gel–gold nanoparticle hybrid materials

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17290-17296 ◽  
Author(s):  
Braja Gopal Bag ◽  
Shib Shankar Dash
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Materials ◽  
Betulinic Acid ◽  
Self Assembly ◽  
Solvent Mixtures ◽  
Potassium Salts ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent ◽  
Removal Studies ◽  
Sodium And Potassium

Sodium and potassium salts of a renewable nano-sized triterpenoid betulinic acid have been prepared and their self-assembly properties in water and aqueous solvent mixtures have been studied.

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