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https://www.readbyqxmd.com/read/30320794/tunable-optical-pulling-force-mediated-by-resonant-electromagnetic-coupling
#1
Guangtao Guo, Tianhua Feng, Yi Xu
In terms of the law of momentum conservation, the optical pulling force (OPF) is a counterintuitive phenomenon for optical manipulation. We investigate analytically and numerically the tunable OPF exerted on the low refractive index nanoparticle (NP) in a hybrid dimer system when it is illuminated by a plane wave based on the coupled dipole approximation method and the finite-difference time-domain method, respectively. The underlying physical mechanism relies on the near-field electromagnetic coupling between the low refractive index dielectric NP and the plasmonic NP...
October 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/30316298/polymer-coated-gold-ferric-oxide-superparamagnetic-nanoparticles-for-theranostic-applications
#2
Muhammad Raisul Abedin, Siddesh Umapathi, Harika Mahendrakar, Tunyaboon Laemthong, Holly Coleman, Denise Muchangi, Santimukul Santra, Manashi Nath, Sutapa Barua
BACKGROUND: Engineered inorganic nanoparticles (NPs) are essential components in the development of nanotechnologies. For applications in nanomedicine, particles need to be functionalized to ensure a good dispersibility in biological fluids. In many cases however, functionalization is not sufficient: the particles become either coated by a corona of serum proteins or precipitate out of the solvent. We show that by changing the coating of magnetic iron oxide NPs using poly-L-lysine (PLL) polymer the colloidal stability of the dispersion is improved in aqueous solutions including water, phosphate buffered saline (PBS), PBS with 10% fetal bovine serum (FBS) and cell culture medium, and the internalization of the NPs toward living mammalian cells is profoundly affected...
October 13, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/30314327/homologous-gold-nanoparticles-and-nanoclusters-composites-with-enhanced-surface-raman-scattering-and-metal-fluorescence-for-cancer-imaging
#3
Xiaoxia Wu, Yan Peng, Xiaomei Duan, Lingyan Yang, Jinze Lan, Fu Wang
A large number of deaths from cancer can be attributed to the lack of effective early-stage diagnostic techniques. Thus, accurate and effective early diagnosis is a major research goal worldwide. With the unique phenomenon of localized surface plasmon resonance (LSPR), plasmonic nanomaterials have attracted considerable attention for applications in surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF). Both SERS and MEF are ultra-sensitive methods for the detection and identification of early tumor at molecular level...
October 11, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30308961/light-trapping-effect-in-perovskite-solar-cells-by-the-addition-of-ag-nanoparticles-using-textured-substrates
#4
Jiabin Hao, Huiying Hao, Jianfeng Li, Lei Shi, Tingting Zhong, Chen Zhang, Jingjing Dong, Jie Xing, Hao Liu, Zili Zhang
In this contribution, the efficiencies of perovskite solar cells have been further enhanced, based on optical optimization studies. The photovoltaic devices with textured perovskite film can be obtained and a power conversion efficiency (PCE) of the textured fluorine-doped tin oxide (FTO)/Ag nanoparticles (NPs) embedded in c-TiO₂/m-TiO₂/CH₃NH₃PbI₃/Spiro-OMeTAD/Au showed 33.7% enhancement, and a maximum of up to 14.01% was achieved. The efficiency enhancement can be attributed to the light trapping effect caused by the textured FTO and the incorporated Ag NPs, which can enhance scattering to extend the optical pathway in the photoactive layer of the solar cell...
October 10, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30303606/enhanced-light-matter-interactions-in-self-assembled-plasmonic-nanoparticles-on-2d-semiconductors
#5
Dinh Hoa Luong, Hyun Seok Lee, Ganesh Ghimire, Jubok Lee, Hyun Kim, Seok Joon Yun, Gwang Hwi An, Young Hee Lee
Two-dimensional (2D) transition-metal dichalcogenide (TMD) monolayers of versatile material library are spotlighted for numerous unexplored research fields. While monolayer TMDs exhibit an efficient excitonic emission, the weak light absorption arising from their low dimensionality limits potential applications. To enhance the light-matter interactions of TMDs, while various plasmonic hybridization methods have been intensively studied, controlling plasmonic nanostructures via self-assembly processes remains challenging...
October 10, 2018: Small
https://www.readbyqxmd.com/read/30302473/gold-loaded-microspheres-via-carbosilane-thioether-dendrimers-as-stabilizers-and-their-performance-in-layer-controllable-photonic-crystals
#6
Yu-Long Tong, Zhijie Zhu, Gang Peng, Tingting Cui, Su Chen
Gold nanoparticle (Au NP) incorporated photonic crystals (PCs) have been extensively studied due to the intricate interplay between the surface plasmon resonance of Au NPs and the periodic nanostructure of PCs. Herein, we successfully synthesized Au NP decorated poly(styrene-co-(generation 3 carbosilane-thioether vinyl-terminated dendrimer)) (P(st-co-G3Vi)) microspheres via in situ reduction of Au ions based on the strong coordination between the Au ions and the sulfur atom in G3Vi dendrimers. These composite Au-doped microspheres demonstrate a bumpy surface topography, which gives rise to a higher hydrophobicity and could effectively suppress the formation of an ubiquitous coffee-ring during the drying process of a colloidal suspension...
October 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/30300548/ph-and-temperature-dual-responsive-plasmonic-switches-of-gold-nanoparticle-monolayer-film-for-multiple-anti-counterfeit
#7
Baoqing Liu, Xuefei Lu, Ze Qiao, Liping Song, Qian Cheng, Jiawei Zhang, Afang Zhang, Youju Huang, Tao Chen
Two-dimensional (2D) gold nanoparticle (Au NP) monolayer film possesses a lot of fascinating peculiarities, and has shown promising applications in photoelectrical device, catalysis, spectroscopy, sensor and anti-counterfeiting. Due to localized surface plasmon resonance (LSPR) property predetermined by the nature structure of metal nanoparticle, it is usually difficult to realize reversible LSPR transition of 2D film. In this work, we report on fabrication of a large-area free-standing Au NP monolayer film with dual-responsive switchable plasmonic property using a pH- or thermal-responsive dendronized copolymer as stimuli-sensitive linker between neighbored NPs...
October 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30299926/high-pressure-effect-on-the-optical-extinction-of-a-single-gold-nanoparticle
#8
Fabio Medeghini, Mike Hettich, Romain Rouxel, Silvio D Silva Santos, Sylvain Hermelin, Etienne Pertreux, Abraao Torres Dias, Franck Legrand, Paolo Maioli, Aurélien Crut, Fabrice Vallée, Alfonso San Miguel, Natalia Del Fatti
When reducing the size of a material from bulk down to nanoscale, the enhanced surface-to-volume ratio and the presence of interfaces make the properties of nano-objects very sensitive not only to confinement effects but also to their local environment. In the optical domain, the latter dependence can be exploited to tune the plasmonic response of metal nanoparticles by controlling their surroundings, notably applying high pressures. To date, only a few optical absorption experiments have demonstrated this feasibility, on ensembles of metal nanoparticles in a diamond anvil cell...
October 9, 2018: ACS Nano
https://www.readbyqxmd.com/read/30294867/photothermal-convection-lithography-for-rapid-and-direct-assembly-of-colloidal-plasmonic-nanoparticles-on-generic-substrates
#9
Chang Min Jin, Wooju Lee, Dongchoul Kim, Taewook Kang, Inhee Choi
Controlled assembly of colloidal nanoparticles onto solid substrates generally needs to overcome their thermal diffusion in water. For this purpose, several techniques that are based on chemical bonding, capillary interactions with substrate patterning, optical force, and optofluidic heating of light-absorbing substrates are proposed. However, the direct assembly of colloidal nanoparticles on generic substrates without chemical linkers and substrate patterning still remains challenging. Here, photothermal convection lithography is proposed, which allows the rapid placement of colloidal nanoparticles onto the surface of diverse solid substrates...
October 7, 2018: Small
https://www.readbyqxmd.com/read/30289245/label-free-single-particle-colorimetric-detection-of-permanganate-by-gnps-ag-core-shell-nanoparticle-with-dark-field-optical-microscopy
#10
Zhongju Ye, Rui Weng, Yanhong Ma, Fuyan Wang, Hua Liu, Lin Wei, Lehui Xiao
Rapid quantification of permanganate (MnO4-) in aqueous solution with a convenient and sensitive single-particle detection (SPD) method is demonstrated by dark-field optical microscopy. The design is based on the selective etching of Ag shell from the glucose-protected GNPs@Ag nanoparticle by MnO4-. In the presence of MnO4-, extraordinary red-shift of localized surface plasmon resonance (LSPR, from blue to green) together with tremendous decrease of the extinction coefficient from individual GNPs@Ag nanoparticle are observed...
October 5, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30288618/antimicrobial-and-cytotoxicity-effects-of-synthesized-silver-nanoparticles-from-punica-granatum-peel-extract
#11
Sandhanasamy Devanesan, Mohamad S AlSalhi, Radhakrishnan Vishnu Balaji, Amirtham Jacob A Ranjitsingh, Anis Ahamed, Akram A Alfuraydi, Fulwah Y AlQahtani, Fadilah S Aleanizy, Ahmed H Othman
To address the growing challenges from drug-resistant microbes and tumor incidence, approaches are being undertaken to phytosynthesize metal nanoparticles, particularly silver nanoparticles, to get remedial measure. In this study, an attempt has been made to utilize a major biowaste product, pomegranate fruit peel (Punica granatum), to synthesize silver nanoparticles. The silver nanoparticles (AgNPs) were synthesized using the aqueous extract of pomegranate peel. The formation of synthesized AgNPs was confirmed through UV-Vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) as well as through the change of the colorless aqueous solution to a dark brown solution...
October 4, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/30284807/design-of-gold-hollow-nanorods-with-controllable-aspect-ratio-for-multimodal-imaging-and-combined-chemo-photothermal-therapy-in-the-second-near-infrared-window
#12
Kai Cai, Weiyun Zhang, Jin Zhang, Huiqiao Li, Heyou Han, Tianyou Zhai
Gold nanoparticles (AuNPs) exhibit great potential of biological application due to their good biocompatibility and tunable localized surface plasmon resonance (LSPR) property. Currently, although tuning of the aspect ratio of solid structure or designing of hollow structure has been performed to regulate the LSPR property of AuNPs, the method of preparing hollow anisotropic AuNPs has rarely been reported. In this study, we designed gold hollow nanorods (AuHNRs) with controllable aspect ratios by a Se-doping Te nanorod-templated method with the assistance of L-cysteine...
October 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30276390/local-trapping-of-energetic-holes-at-gold-nanoparticles-on-tio-2
#13
Hiroyasu Nishi, Masumi Sakamoto, Tetsu Tatsuma
Oxidation sites for plasmon-induced charge separation at gold nanocubes and nanorods on TiO2 were visualized by PbO2 deposition, and the sites were localized at plasmonic resonance sites. This indicates that energetic holes generated at those sites dominate the reactions, which can be applied to photo-nanofabrication beyond the diffraction limit.
October 16, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30275446/strong-coupling-and-induced-transparency-at-room-temperature-with-single-quantum-dots-and-gap-plasmons
#14
Haixu Leng, Brian Szychowski, Marie-Christine Daniel, Matthew Pelton
Coherent coupling between plasmons and transition dipole moments in emitters can lead to two distinct spectral effects: vacuum Rabi splitting at strong coupling strengths, and induced transparency (also known as Fano interference) at intermediate coupling strengths. Achieving either strong or intermediate coupling between a single emitter and a localized plasmon resonance has the potential to enable single-photon nonlinearities and other extreme light-matter interactions, at room temperature and on the nanometer scale...
October 1, 2018: Nature Communications
https://www.readbyqxmd.com/read/30274109/hydroxide-assisted-synthesis-of-monodisperse-and-biocompatible-gold-nanoparticles-with-dextran
#15
Junqi Tang, Xuewen Fu, Quanhong Ou, Kunpeng Gao, Shi-Qing Man, Jie Guo, Yingkai Liu
A simple and rapid approach to synthesize monodisperse and biocompatible gold nanoparticles (AuNPs) employing dextran as a reducing and stabilizing agents at different reaction conditions was described. The obtained dextran-gold nanoparticles (Dex-AuNPs) were characterized by transmission electron microscopy (TEM), UV-Vis spectroscopy, Nuclear magnetic resonance (NMR) spectroscopy, Fourier transformer infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis. The TEM examinations showed the resultant particles were 4-50 nm in size, monodispersity and uniform particle size distribution...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/30270469/efficient-degradation-of-phenol-and-4-nitrophenol-by-surface-oxygen-vacancies-and-plasmonic-silver-co-modified-bi2moo6-photocatalysts
#16
Huidong Shen, Wenwen Xue, Feng Fu, Jiefang Sun, Yanzhong Zhen, Danjun Wang, Bing Shao, Junwang Tang
In this work, we rationally combined the surface plasmon resonance effect of metallic Ag, surface oxygen vacancies and Bi2MoO6 photocatalyst together to construct novel oxygen vacancy-rich Ag/Bi2MoO6 (A/BMO-SOVs) photocatalysts and further investigated its synergistic effect on photocatalytic degradation of phenol and 4-nitrophenol under visible light irradiation (λ ≥ 420 nm). TEM, EPR and Raman spectra demonstrated the co-existence of metallic Ag nanoparticles, surface oxygen vacancies and Bi2MoO6 due to a controlled calcination process...
September 30, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30267409/sensitive-simple-and-rapid-colorimetric-detection-of-malachite-green-in-water-salmon-and-canned-tuna-samples-based-on-gold-nanoparticles
#17
Mina Heleyel, Shahla Elhami
BACKGROUND: Malachite green is used in aquaculture and fisheries as fungicides and antiseptic and it is also used in industry as a dye. However, Malachite green is carcinogenic and highly toxic for human and animal. In this study, a spectrophotometric method was developed to detect Malachite green. The method was based on the surface plasmon resonance property of gold nanoparticles and interaction between malachite green and gold nanoparticles. RESULTS: Malachite green-gold nanoparticles were rapidly aggregated in the acidic medium; as a result, a color change from red to blue was observed, which was easily detectable by the naked eye...
September 28, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/30265968/morphological-control-of-nanoprobe-for-colorimetric-antioxidant-detection
#18
Yi Wang, Pu Zhang, Wensheng Fu, Yingnan Zhao
Colloidal metal nanoparticles (NPs) with remarkable localized surface plasmon resonance (LSPR) have found wide use as probes in sensing. The LSPR that employed as the sensing signal is strongly associated with the morphology of nanoprobes. In this work, morphological change of Au nanocage to Au@Ag nanobox and thus the LSPR evolution are well regulated by trace amount of antioxidant, where the mechanism of seed-mediated growth is used as a powerful means in this process. Based on the linear relationship between morphology-induced LSPR evolution and the concentration of antioxidant, a simple, reliable and highly sensitive colorimetric method is developed for antioxidant detection...
December 30, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30265009/nonlinear-viscoelasticity-of-highly-ordered-two-dimensional-assemblies-of-metal-nanoparticles-confined-at-the-air-water-interface
#19
Shihomi Masuda, Salomé Mielke, Federico Amadei, Akihisa Yamamoto, Pangpang Wang, Takashi Taniguchi, Kenichi Yoshikawa, Kaoru Tamada, Motomu Tanaka
In this study, we investigated the viscoelastic properties of metal nanoparticle monolayers at the air/water interface by dilational rheology under the periodic oscillation of surface area. Au nanoparticles capped with oleylamine form a stable, dense monolayer on a Langmuir film balance. The stress response function of a nanoparticle monolayer was first analyzed using the classical Kelvin-Voigt model, yielding the spring constant and viscosity. The obtained results suggest that the monolayer of nanoparticles is predominantly elastic, forming a two-dimensional physical gel...
September 28, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30261657/recent-advances-of-plasmonic-nanoparticles-and-their-applications
#20
REVIEW
Jianxun Liu, Huilin He, Dong Xiao, Shengtao Yin, Wei Ji, Shouzhen Jiang, Dan Luo, Bing Wang, Yanjun Liu
In the past half-century, surface plasmon resonance in noble metallic nanoparticles has been an important research subject. Recent advances in the synthesis, assembly, characterization, and theories of traditional and non-traditional metal nanostructures open a new pathway to the kaleidoscopic applications of plasmonics. However, accurate and precise models of plasmon resonance are still challenging, as its characteristics can be affected by multiple factors. We herein summarize the recent advances of plasmonic nanoparticles and their applications, particularly regarding the fundamentals and applications of surface plasmon resonance (SPR) in Au nanoparticles, plasmon-enhanced upconversion luminescence, and plasmonic chiral metasurfaces...
September 26, 2018: Materials
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