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Yaocheng Deng, Lin Tang, Chengyang Feng, Guangming Zeng, Jiajia Wang, Yaoyu Zhou, Yani Liu, Bo Peng, Haopeng Feng
To realize the full utilization of solar energy, the design of highly efficient photocatalyst with improved visible-near-infrared photocatalysis performance has attracted great attentions for environment pollutant removal. In this work, we rationally employed the surface plasmon resonance effect of metallic Ag in the phosphorus doped ultrathin g-C3N4 nanosheets (PCNS) and BiVO4 composites to construct a ternary Ag@PCNS/BiVO4 photocatalyst. It was applied for the photodegradation of ciprofloxacin (CIP), exhibiting 92...
November 15, 2017: Journal of Hazardous Materials
Eva De Leo, Ario Cocina, Preksha Tiwari, Lisa V Poulikakos, Patricia Marqués-Gallego, Boris leFeber, David J Norris, Ferry Prins
Combining the ability to localize electromagnetic fields at the nanoscale with a directional response, plasmonic antennas offer an effective strategy to shape the far-field pattern of coupled emitters. Here, we introduce a family of directional multi-resonant antennas that allows for polarization-resolved spectral identification of fluorescent emission. The geometry consists of a central aperture surrounded by concentric polygonal corrugations. By varying the periodicity of each axis of the polygon individually, this structure can support multiple resonances that provide independent control over emission directionality for multiple wavelengths...
November 21, 2017: ACS Nano
Andrea Torchi, Federica Simonelli, Riccardo Ferrando, Giulia Rossi
Photothermal therapies are based on the optical excitation of plasmonic nanoparticles in the biological environment. The effects of the irradiation on the biological medium depend critically on the heat transfer process at the nanoparticle interface, on the temperature reached by the tissues as well as on the spatial extent of temperature gradients. Unfortunately, both the temperature and its biological effects are difficult to be probed experimentally at the molecular scale. Here, we approach this problem using non-equilibrium molecular dynamics simulations...
November 21, 2017: ACS Nano
Yueli Xing, Xinmin Li, Taixian Yuan, Wei Cheng, Dandan Li, Tianxiao Yu, Xiaojuan Ding, Shijia Ding
Recently, hairpin stacking circuits (HSC) based on toehold-mediated strand displacement have been engineered to detect nucleic acids and proteins. However, the three metastable hairpins in a HSC system can potentially react non-specifically in the absence of a catalyst, limiting its practical application. Here, we developed a unique hairpin design guideline to eliminate circuit leakage of HSC, and the high-performance HSC was successfully implemented on logic gate building and biosensing. We began by analyzing the sources of circuit leakage and optimizing the toehold lengths of hairpins in the HSC system based on the surface plasmon resonance (SPR) technique...
November 21, 2017: Analyst
Lihui Lin, Yanxin Lu, Mengmeng Yuan, Fenghua Shi, Haixia Xu, Yihang Chen
Graphene plasmons, owing to their diverse applications including electro-optical modulation, optical sensing, spectral photometry and tunable lighting at the nanoscale, have recently attracted much attention. One key challenge in advancing this field is to precisely control the propagation of graphene plasmons. Here, we propose an on-chip integrated platform to engineer the wave front of the graphene plasmons through a metasurface with a refractive index of zero. We demonstrate that a well-designed graphene/photonic-crystal metasurface can possess conical plasmonic dispersion at the Brillouin zone center with a triply degenerate state at the Dirac frequency, giving rise to the zero-effective-index of graphene plasmons...
November 21, 2017: Nanoscale
Jin Zhu, Xiaolong Li, Wei Zheng, Biao Wang, Yubo Tian
The results of this reported work indicated that gold nanoparticles (Au NPs) arrays self-assembled on Indium Tin Oxide (ITO) glasses can obtain broader localized surface plasmon resonance (LSPR) wavelength range and higher sensitivity than the bare quartz. The results of surface electric field calculated using Finite Difference Time Domain (FDTD) showed that the electric field of nanoparticles on ITO glasses is enhanced and the repulsive forces within each particle is weakened. According to the dipolar interaction mechanism, a weakened repulsive forces within each particle lead to a lower resonance frequency and a strong redshift of the LSPR spectra...
November 21, 2017: Nanotechnology
Lanlan Li, Wei Wei, Wen-Juan Jia, Yongchang Zhu, Yan Zhang, Jiang-Huai Chen, Jiaqi Tian, Huanxiang Liu, Yong-Xing He, Xiaojun Yao
Conformational conversion of the normal cellular prion protein, PrP(C), into the misfolded isoform, PrP(Sc), is considered to be a central event in the development of fatal neurodegenerative diseases. Stabilization of prion protein at the normal cellular form (PrP(C)) with small molecules is a rational and efficient strategy for treatment of prion related diseases. However, few compounds have been identified as potent prion inhibitors by binding to the normal conformation of prion. In this work, to rational screening of inhibitors capable of stabilizing cellular form of prion protein, multiple approaches combining docking-based virtual screening, steady-state fluorescence quenching, surface plasmon resonance and thioflavin T fluorescence assay were used to discover new compounds interrupting PrP(C) to PrP(Sc) conversion...
November 20, 2017: Journal of Computer-aided Molecular Design
Akbar Samadi, Poul Martin Bendix, Lene B Oddershede
Nanostructures with exceptional absorption in the near infrared (NIR) regime are receiving significant attention due to their ability to promote controlled local heating in biological material upon irradiation. Also, such nano-structures have numerous applications in nano-electronics and for bio-exploration. Therefore, significant effort is being put into controlling and understanding plasmonic nanostructures. However, essentially all focus has been on NIR resonant gold nanoparticles and remarkably little attention has been given to nanoparticles of other materials that may have superior properties...
November 21, 2017: Nanoscale
C Dab, C Awada, A Merlen, A Ruediger
We report on photochemical and photophysical properties produced by Surface Plasmon Resonance (SPR) on metallic nanograins by means of high resolution Functionalized Tip-Enhanced Raman Spectroscopy (F-TERS). This technique relies on a sharp gold tip functionalized with Raman-active molecules to be scanned relatively to plasmonic hot-spots on a surface. We describe the local variation of plasmon-induced Raman enhancement on the surface of nanostructures that also affects the photochemistry while the quantitative interpretation of peak intensities requires the consideration of surface topography near the tip apex...
November 21, 2017: Physical Chemistry Chemical Physics: PCCP
Kun-Che Kao, Yoshinori Kuroiwa, Hiroyasu Nishi, Tetsu Tatsuma
Metal-semiconductor plasmonic nanostructures are capable of converting light energy through plasmon-induced charge separation (PICS), providing fruitful new strategies to utilize solar energy in various fields, including photocatalysis. Here, we enhance the PICS efficiencies for hydrogen evolution from water at a Pt cathode coupled with a TiO2/Au photoanode by coating the TiO2/Au with a p-type NiO layer on which a Pt co-catalyst is deposited. PICS occurs at the Au-TiO2 interface under visible light. The electrons injected from the Au nanoparticles into TiO2 are transported to the Pt cathode and cause hydrogen evolution from water, the action spectrum of which matches the plasmonic extinction spectrum of the Au nanoparticles...
November 21, 2017: Physical Chemistry Chemical Physics: PCCP
Xianzhong Yang, Jing Li, Yuxin Zhao, Jianhua Yang, Liyan Zhou, Zhigao Dai, Xiao Guo, Shanjun Mu, Quanzhen Liu, Chunming Jiang, Mengtao Sun, Jianfang Wang, Wenjie Liang
Plasmonic nanomaterials, along with their assemblies, provide numerous applications due to their profound optical properties. In this work, we report the self-assembly of Au@Ag core-shell nanocuboids (NCs) into staircase superstructures in both vertical and horizontal orientations through two-stage droplet evaporation. Each stair is composed of a uniform well-aligned monolayer of NCs. The gap distance between NCs can be greatly shrunk to boost the corresponding surface-enhanced Raman scattering (SERS) performance using an ethanol wash method...
November 21, 2017: Nanoscale
Yu-Jung Lu, Ruzan Sokhoyan, Wen-Hui Cheng, Ghazaleh Kafaie Shirmanesh, Artur R Davoyan, Ragip A Pala, Krishnan Thyagarajan, Harry A Atwater
Emission control of colloidal quantum dots (QDs) is a cornerstone of modern high-quality lighting and display technologies. Dynamic emission control of colloidal QDs in an optoelectronic device is usually achieved by changing the optical pump intensity or injection current density. Here we propose and demonstrate a distinctly different mechanism for the temporal modulation of QD emission intensity at constant optical pumping rate. Our mechanism is based on the electrically controlled modulation of the local density of optical states (LDOS) at the position of the QDs, resulting in the modulation of the QD spontaneous emission rate, far-field emission intensity, and quantum yield...
November 21, 2017: Nature Communications
Ilaria Moscetti, Salvatore Cannistraro, Anna Rita Bizzarri
Surface Plasmon Resonance (SPR) is a powerful technique to study the kinetics of biomolecules undergoing biorecognition processes, particularly suited for protein-protein interactions of biomedical interest. The potentiality of SPR was exploited to sense the interactions occurring within the network of the tumor suppressor p53, which is crucial for maintaining genome integrity and whose function is inactivated, mainly by down regulation or by mutation, in the majority of human tumors. This study includes p53 down-regulators, p53 mutants and also the p53 family members, p63 and p73, which could vicariate p53 protective function...
November 20, 2017: Sensors
Naseer Muhammad, Adnan Daud Khan, Zi-Lan Deng, Karim Khan, Ashish Yadav, Qiang Liu, Zhengbiao Ouyang
We report spectral splitting behaviors based on Fano resonances in a novel simple planar metasurface composed of gold nanobars and nanorings. Multiple plasmonic modes and sharp Fano effects are achieved in a broadband transmittance spectrum by exploiting the rotational symmetry of the metasurface. The transmission properties are effectively modified and tuned by modulating the structural parameters. The highest single side Q-factor and FoM which reaches 196 and 105 are observed at Fano resonances. Our proposed design is relatively simple and can be applied for various applications such as multi-wavelength highly sensitive plasmonic sensors, switching, and slow light devices...
November 19, 2017: Nanomaterials
Samuel S Hinman, Kristy S McKeating, Quan Cheng
Three-dimensional (3D) printing has undergone an exponential growth in popularity due to its revolutionary and near limitless manufacturing capabilities. Recent trends have seen this technology utilized across a variety of scientific disciplines, including the measurement sciences, but precise fabrication of optical components for high performance biosensing has not yet been demonstrated. We report here 3D printing of high-quality, custom prisms by stereolithography that enable Kretschmann- configured plasmonic sensing of bacterial toxins...
November 20, 2017: Analytical Chemistry
Yanhui Zhang, Hongxu Guo, Wen Weng, Ming-Lai Fu
Reduced graphene oxide (RGO) as an electron-conductive medium and photosensitizer have been widely used to construct efficient RGO/semiconductor photocatalysts for solar energy conversion; however, the role of RGO has been largely underestimated. Herein, the surface plasmon resonance (SPR) effect, thermal effect, support effect, and size effect of Au/RGO are demonstrated to play important roles in enhancing the photocatalytic activity, which has not been considered previously. Au/RGO nanocomposites, synthesized via a facile wet chemistry route, exhibit an excellent visible light photocatalytic performance for selective oxidation of benzylic alcohols...
November 20, 2017: Physical Chemistry Chemical Physics: PCCP
Niranjan V Ilawe, M Belén Oviedo, Bryan M Wong
No abstract text is available yet for this article.
November 20, 2017: Journal of Chemical Theory and Computation
Jun Guo, Yin Zhang, Lin Shi, Yanfei Zhu, Megersa Feyissa Mideksa, Ke Hou, Wenshi Zhao, Dawei Wang, Meiting Zhao, Xiaofei Zhang, Jiawei Lv, Jianqi Zhang, Xiaoli Wang, Zhiyong Tang
Hetero-nanostructures featured with both strong plasmon absorption and high catalytic activity are believed to be ideal platforms to realize efficient light-driven catalysis. However, in reality it remains great challenge to acquire high performance catalysis in such hetero-nanostructures due to poor generation and transfer of plamson-induced hot electrons. In this report, we demonstrate that Au nanorod@Pd superstructures (Au@Pd SSs), where the ordered Pd nanoarrays are precisely grown on Au nanorod surfaces via solution-based seed-mediated approach, would be an excellent solution for this challenge...
November 20, 2017: Journal of the American Chemical Society
Anneli Joplin, Seyyed Ali Hosseini Jebeli, Eric Sung, Nathan Diemler, Patrick J Straney, Mustafa Yorulmaz, Wei-Shun Chang, Jill E Millstone, Stephan Link
Bimetallic nanocatalysts have the potential to surmount current limitations in industrial catalysis if their electronic and optical properties can be effectively controlled. However, improving the performance of bimetallic photocatalysts requires a functional understanding of how the intricacies of their morphology and composition dictate every element of their optical response. In this work, we examine Au and Pt-decorated Au nanorods on a single particle level to ascertain how Pt influences the plasmon resonance of the bimetallic nanostructure...
November 20, 2017: ACS Nano
Fairus Atida Said, Pulliyaseri Susthitha Menon, Venkatachalam Rajendran, Sahbudin Shaari, Burhanuddin Y Majlis
In this study, the authors investigated the effects of a single layer graphene as a coating layer on top of metal thin films such as silver, gold, aluminum and copper using finite-difference time domain method. To enhance the resolution of surface plasmon resonance (SPR) sensor, it is necessary to increase the SPR reflectivity and decrease the full-width-half maximum (FWHM) of the SPR curve so that there is minimum uncertainty in the determination of the resonance dip. Numerical data was verified with analytical and experimental data where all the data were in good agreement with resonance angle differing in <10% due to noise present in components such as humidity and temperature...
December 2017: IET Nanobiotechnology
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