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plasmon resonance nanoparticles

Samaneh Kameli, Ali Mehrizad
Recent improvements based on heterojunction nanocomposites have opened new possibilities in photocatalysis. In this research, an ultrasound assisted co-precipitation method was used to fabricate silver, zinc sulfide, and reduced graphene oxide (Ag-ZnS/rGO) nanocomposite, and characterization results indicated that 3% Ag-ZnS spherical nanoparticles are successfully embedded in rGO matrix. The potential of the Ag-ZnS/rGO, as a visible light active photocatalyst, was assessed through optimizing degradation of Tetracycline (TC) by response surface methodology...
August 14, 2018: Photochemistry and Photobiology
Cristiano Matricardi, Christoph Hanske, Juan Luis Garcia-Pomar, Judith Langer, Agustin Mihi, Luis M Liz-Marzán
Metal colloids are of great interest in the field of nanophotonics, mainly due to their morphology-dependent optical properties, but also because they are high quality building blocks for complex plasmonic architectures. Close-packed colloidal supercrystals not only serve for investigating the rich plasmonic resonances arising in strongly coupled arrangements, but also enables tailoring the optical response, on both the nano- and the macroscale. Bridging these vastly different length scales at reasonable fabrication costs has remained fundamentally challenging, but is essential for applications in sensing, photovoltaics or optoelectronics, among other fields...
August 14, 2018: ACS Nano
Churong Ma, Jiahao Yan, Yingcong Huang, Chengxin Wang, Guowei Yang
Nanophotonic materials for solar energy harvesting and photothermal conversion are urgently needed to alleviate the global energy crisis. We demonstrate that a broadband absorber made of tellurium (Te) nanoparticles with a wide size distribution can absorb more than 85% solar radiation in the entire spectrum. Temperature of the absorber irradiated by sunlight can increase from 29° to 85°C within 100 s. By dispersing Te nanoparticles into water, the water evaporation rate is improved by three times under solar radiation of 78...
August 2018: Science Advances
Joseph Adetunji Elegbede, Agbaje Lateef, Musibau Adewuyi Azeez, Tesleem Babatunde Asafa, Taofeek Akangbe Yekeen, Iyabo Christianah Oladipo, Elijah Adegoke Adebayo, Lorika Selomi Beukes, Evariste Bosco Gueguim-Kana
Green synthesis of nanoparticles has fuelled the use of biomaterials to synthesise a variety of metallic nanoparticles. The current study investigates the use of xylanases of Aspergillus niger L3 (NEA) and Trichoderma longibrachiatum L2 (TEA) to synthesise silver nanoparticles (AgNPs). Characterisation of AgNPs was carried out using UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy, while their effectiveness as antimicrobial, antioxidant, catalytic, anticoagulant, and thrombolytic agents were determined...
September 2018: IET Nanobiotechnology
Remya Vijayan, Siby Joseph, Beena Mathew
The present work is emphasised on the bio-fabrication of silver and gold nanoparticles in a single step by a microwave-assisted method using the leaf extract of Synedrella nodiflora as both reducing and stabilising agent . The synthesised nanoparticles are highly stable and show surface plasmon resonance peak at 413 and 535 nm, respectively, for silver and gold nanoparticles in UV-Vis spectrum. The functional group responsible for the reduction of metal ions were obtained from Fourier transform infrared spectroscopy...
September 2018: IET Nanobiotechnology
Elias E Elemike, Damian C Onwudiwe, Anthony C Ekennia, Anine Jordaan
In this study, the conversion of silver ions into ∼30.74 nm sized silver nanoparticles (AgNPs) was achieved in 30 min at a reaction temperature of 80-90°C in aqueous leaf extract of Artemisia afra . The synthesised AgNPs showed surface plasmon resonance in the range of 423-438 nm. Spherical and face-centred cubic nanoparticles were confirmed by transmission electron microscope (TEM) and X-ray diffraction (XRD) analysis, respectively. Fourier transform infra-red (FTIR) results indicated that the obtained nanoparticles were stabilised and capped through the carbonyl and carboxylate ion groups possibly from flavonoids, terpenoids, phenolics and esters content of the extracts...
September 2018: IET Nanobiotechnology
Seungjoo Yi, Won Kyu Lee, Ji-Ho Park, Jae-Seung Lee, Ji-Hun Seo
The goal of this study is to develop a simple one-pot method for the synthesis of a zwitterionic small molecule bearing disulfide moiety, which can effectively inhibit nonspecific protein adsorption on macroscopic and nanoscopic gold surfaces. To this end, the optimal molecular structure of a pyridine disulfide derivative was explored and a zwitterionic small molecule was successfully synthesized from the tertiary amine residue on the pyridine ring through a one-pot method. The coating conditions of the synthesized zwitterionic molecules on the gold surface were optimized through contact angle measurements, and the strong interactions between the gold surface and the disulfide moiety of the zwitterion small molecule were confirmed by surface plasmon resonance (SPR) analysis and X-ray photoelectron spectroscopy...
August 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ayaz Anwar, Aaliya Minhaz, Syed Saad Hussain, Areeba Anwar, Shabana Usman Simjee, Muhammad Ishaq, Naveed Ahmed Khan, Muhammad Raza Shah
Gold nanoparticles (AuNPs) stabilized by new cationic 1‑(3‑(acetylthio)propyl)pyrazin‑1‑ium ligand (PPTA) were synthesized. AuNPs stabilized by PPTA (PPTA-AuNPs) were found to be spherical and polydispersed with the average size of 60 nm. Human neuroblastoma (SHSY-5Y) cells permeability of PPTA-AuNPs was found to be a key feature to study the intracellular quenching of Fe(III) proliferative activity. In vitro MTT assay revealed non-cytotoxicity of PPTA and PPTA-AuNPs at 100 μM concentration, while treatment of 100 μM of Fe(III) with SHSY-5Y cells resulted into higher cells viability...
August 1, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Mingjin Dai, Hongyu Chen, Rui Feng, Wei Feng, Yunxia Hu, Huihui Yang, Guangbo Liu, Xiaoshuang Chen, Jia Zhang, Cheng-Yan Xu, PingAn Hu
A dual-band self-powered photodetector (SPPD) with high sensitivity is realized by a facile combination of InSe Schottky diode and Au plasmonic nanoparticle (NP) arrays. Comparing with pristine InSe devices, InSe/Au photodetectors possess an additional capability of photodetection in visible to near-infrared (NIR) region. This intriguing phenomenon is attributed to the wavelength selective enhancement of pristine responsivities by hybridized quadrupole plasmons resonance of Au NPs. It is worth pointing out that the maximum of enhancement ratio in responsivity reaches up to ~1200% at wavelength of 685 nm...
August 10, 2018: ACS Nano
Aruna Jyothi Kora
Selenium nanoparticles (Se NPs) were synthesised using sodium borohydride as a reductant and gum kondagogu as a stabiliser. Plant gum serves as a renewable, non-toxic, non-immunogenic, biopolymer based feedstock. Role of gum on synthesis and mean particle size was studied using ultraviolet-visible spectroscopy and dynamic light scattering. NP generation was visualised with orange red colouration and NPs exhibited a surface plasmon resonance peak at 250 nm. Formed NPs were amorphous, polydisperse and spherical...
August 2018: IET Nanobiotechnology
Luke Henderson, Oara Neumann, Caterina Kaffes, Runmin Zhang, Valeria Marangoni, Murali K Ravoori, Vikas Kundra, James Bankson, Peter Nordlander, Naomi J Halas
Engineering a compact, near-infrared plasmonic nanostructure with integrated image-enhancing agents for combined imaging and therapy is an important nanomedical challenge. Recently we showed that Au@Si@Au nanomatryoshkas (NM) are a highly promising nanostructure for hosting either T1 MRI or fluorescent contrast agents with a photothermal therapeutic response in a compact geometry. Here we show that a near-infrared-resonant NM can provide simultaneous contrast enhancement for both T1 magnetic resonance imaging (MRI) and fluorescence optical imaging (FOI) by encapsulating both types of contrast agents in the internal silica layer between the Au core and shell...
August 8, 2018: ACS Nano
Kamsul Abraha, Agung Bambang Setio Utomo
A theoretical analysis and computational study of biomaterial sample detection with surface plasmon resonance (SPR) phenomenon spectroscopy are presented in this work with the objective of achieving more sensitive detection. In this paper, a Fe₃O₄@Au core-shell, a nanocomposite spherical nanoparticle consisting of a spherical Fe₃O₄ core covered by an Au shell, was used as an active material for biomaterial sample detection, such as for blood plasma, haemoglobin (Hb) cytoplasm and lecithin, with a wavelength of 632...
August 7, 2018: Biosensors
Xiangyan Chen, Xia Zhao, Yanyun Gao, Jiaqi Yin, Mingyue Bai, Fahe Wang
Gold nanoparticles (AuNPs) have been widely used in catalysis, photothermal therapy, and targeted drug delivery. Carrageenan oligosaccharide (CAO) derived from marine red algae was used as a reducing and capping agent to obtain AuNPs by an eco-friendly, efficient, and simple synthetic route for the first time. The synthetic conditions of AuNPs were optimized by response surface methodology (RSM), and the CAO-AuNPs obtained were demonstrated to be ellipsoidal, stable and crystalline by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD)...
August 7, 2018: Marine Drugs
Jing Gao, Minna Jia, Yingying Xu, Jimin Zheng, Na Shao, Meiping Zhao
A highly sensitive colorimetric method for detection of alkaline phosphatase (ALP) and carbohydrate antigen (CA125) was developed, which was achieved by ascorbic acid (AA) - mediated enhanced growth of silver nanoparticles (AgNPs) promoted with NaBH4 as pre-reducing agent. With prereduction by NaBH4 , the AA controlled growth of AgNPs was promoted and the localized surface plasmon resonance absorbance was much higher compared with that without prereduction. ALP could hydrolyze L-ascorbic acid 2-phosphate trisodium salt (AAP) to form AA, which could then reduce Ag+ to AgNPs resulting in the enhancement of localized surface plasmon resonance peak of AgNPs and accompanying the color change from colorless to bright yellow...
November 1, 2018: Talanta
Alexander Lambert, Zhanjun Yang, Wei Cheng, Zhenda Lu, Ying Liu, Quan Cheng
Sensitive detection and monitoring of biological interactions in a high throughput, multiplexed array format has numerous advantages. We report here a method to enhance detection sensitivity in surface plasmon resonance (SPR) spectroscopy and SPR imaging via the effect of accumulation of conjugated nanoparticles of varying sizes. Bacterial cholera toxin (CT) was chosen for the demonstration of enhanced immunoassay by SPR. After immobilization of CT on a gold surface, specific recognition is achieved by biotinylated anti-CT...
August 7, 2018: ACS Sensors
Dezheng Darson Li, Xi Gu, Victoria Timchenko, Qing Nian Chan, Anthony Chin Yin Yuen, Guan-Heng Yeoh
Gold nanoparticle aggregation has a strong influence on the plasmonic resonance and hence the effectiveness in various photothermal applications. In relation to this, a comprehensive numerical model is developed to simulate and characterise the gold nanoparticle aggregation process at various particle volume fractions and base fluid pH levels. Computational fluid dynamics techniques are utilised to model the base fluid, while discrete phase modelling is adopted in determining the nanoparticle trajectories. Two-way coupling is implemented to handle the particle-fluid interactions...
August 4, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Laurent Lermusiaux, Sébastien Bidault
DNA is a powerful tool to assemble gold nanoparticles into discrete structures with tunable plasmonic properties for photonic or biomedical applications. Because of their photothermal properties or when used in biological media, these nanostructures can experience drastic modifications of the local temperature that can affect their morphology and, therefore, their optical responses. Using single nanostructure spectroscopy, we demonstrate that, even with a fully stable DNA linker, gold particle dimers can undergo substantial conformational changes at temperatures larger than 50 ◦C and aggregate irreversibly...
August 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yuanyuan Yao, Ji Ji, Hongding Zhang, Kun Zhang, Baohong Liu, Pengyuan Yang
Single-cell analysis provides an important strategy to evaluate cellular heterogeneity. Although surface-enhanced Raman scattering (SERS) has been considered as a promising label-free technique for single-cell analysis, it remains at the early stage for characterizing the extracellular metabolites of single cells. Herein, we developed a convenient, flexible and straightforward three-dimensional (3D) plasmonic trap array for simultaneously compartmentalizing and sensitively detecting single-cell metabolite. The 3D trap was spontaneously self-formed by an interfacial-energy-driven process when a liquid droplet was covered with an immiscible oil liquid (polydimethylsiloxane, PDMS)...
August 3, 2018: Analytical Chemistry
Liang Shang, Chuanjun Liu, Bin Chen, Kenshi Hayashi
Detection of plant volatile organic compounds (VOCs) enables monitoring of pests and diseases in agriculture. We previously revealed that a localized surface plasmon resonance (LSPR) sensor coated with a molecularly imprinted sol-gel (MISG) can be used for cis-jasmone vapor detection. Although the selectivity of the LSPR sensor was enhanced by the MISG coating, its sensitivity was decreased. Here, gold nanoparticles (AuNPs) were doped in the MISG to enhance the sensitivity of the LSPR sensor through hot spot generation...
August 3, 2018: ACS Sensors
Haijie Lu, Jianbin Pan, Yinzhu Wang, Si-Yuan Ji, Wei Zhao, Xiliang Luo, Jing-Juan Xu, Hong-Yuan Chen
This paper describes an electrochemiluminescence resonance energy transfer (ECL-RET) system using Ru(bpy)32+-doped silica nanoparticles (RuSi NPs) as the ECL donor and hollow Au nanocages as the ECL acceptor. Tetrahedron DNA (TD) was used to construct the biosensing interface and control the distance (4.8 nm) between the ECL donor-acceptor pairs. The surface plasmon resonance (SPR) nanostructures, Au nanocages were assembled via the hairpin based sandwich assay. Due to the well overlap between the plasmon absorption spectrum of Au nanocages (628 nm) and the ECL emission spectrum of RuSi NPs (620 nm), high efficient energy transfer could occur...
August 3, 2018: Analytical Chemistry
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