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Semiconductor plasmonic

Maofeng Zhang, Tun Chen, Yongkai Liu, Jiluan Zhang, Haoran Sun, Jian Yang, Jiping Zhu, Jia-Qin Liu, Yu-Cheng Wu
It is urgent to develop a rapid, reliable and in-site determination method to detect or monitor trace amounts of toxic substances in the field. Here, we report an alternative surface-enhanced Raman scattering (SERS) method coupled with a portable Raman device on a plasmonic three-dimension (3D) hot spots sensing surface. Plasmonic AgNPs were uniformly deposited on a 3D TiO2 nanopore arrays as sensitive SERS substrate, and further coated with graphene oxide (GO). We demonstrate the plasmon-induced SERS enhancement (5...
October 18, 2018: ACS Sensors
S Glassner, H Keshmiri, D J Hill, J F Cahoon, B Fernandez, M I den Hertog, A Lugstein
The combination of Moore's law and Dennard's scaling rules have constituted the fundamental guidelines for the silicon-based semiconductor industry for decades. Furthermore, the enormous growth of global data volume has pushed the demand for complex and densely packed devices. In recent years, it has become clear that wired interconnects impose increasingly severe speed and power limitations onto integrated circuits as scaling slows toward a halt. To overcome these limitations, there is a clear need for optical data processing...
October 18, 2018: Nano Letters
Zhengqing Liu, Ziyang Lu, Michel Bosman, Na Li, Terry J Frankcombe, Guohua Jia, Antonio Tricoli, Yun Liu, Yaping Du, Zongyou Yin
Durability is still one of the key obstacles for the further development of photocatalytic energy-conversion systems, especially low-dimensional ones. Encouragingly, recent studies show that nanoinsulators such as SiO2 and MgO exhibit substantially enhanced photocatalytic durability than the typical semiconductor p25 TiO2 . Extending this knowledge, MgO-Au plasmonic defect nanosystems are developed that combine the stable photoactivity from MgO surface defects with energy-focusing plasmonics from Au nanoparticles (NPs), where Au NPs are anchored onto monodispersed MgO nanotemplates...
October 17, 2018: Small
Huimin Liu, Hui Song, Wei Zhou, Xianguang Meng, Jinhua Ye
Searching for highly active and efficient photocatalysts for photo-induced/photo-assisted reactions is always the most challenging task for solar energy utilization. In previous studies, the search for such materials has mainly focused on precious plasmonic metals (Au, Ag, Cu, etc) and semiconductor oxides (TiO2, ZnO, WO3, etc). Here, we report the potential application of hexagonal tantalum mononitride (TaN) as optical support in photocatalytic reactions, which could harness visible light to assist CO2 conversion and decompose organic pollutants...
October 17, 2018: Angewandte Chemie
Tanujjal Bora, Joydeep Dutta
Silver-zinc oxide nanorods (Ag-ZnO NRs) and gold-zinc oxide nanorods (Au-ZnO NRs) plasmonic photocatalysts were fabricated by the deposition of Ag and Au nanoparticles on ZnO NRs. The photocatalysts were studied with electron microscopy, energy dispersive spectroscopy (EDS), UVvis optical absorption and photoluminescence spectroscopy. The effect of type of metals on the ZnO surface on its photocatalytic activity under ultra violet (UV) as well as visible light excitation are investigated and their contribution towards enhanced photo-generated charge separation in terms of the type of junction (Ohmic or Schottky) the metal forms with the semiconductor are explained...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Kamal Kumar Paul, P K Giri
Shape tailored TiO₂ nanostructures with various dimensionality (zero to three dimension) have unique physicochemical and functional properties that facilitates its efficient energy and environment applications, e.g., solar light driven photocatalytic hydrogen generation and decontamination of organic/inorganic toxic pollutants, CO₂ reduction into the hydrocarbon fuels, solar cells, supercapacitors and lithium-ion batteries etc. However, the wide band gap nature and the fast recombination of the photogenerated charge carriers in TiO₂ usually limit its overall performance under solar light illumination...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Jialu Li, Yuan Zhao, Linlong Tang, Changbin Nie, Jing Wang, Wei Yao
We present an insulator-semiconductor-metal plasmonic hot-electron photodetector based on a grating structure that uses monolayer MoS₂ as a semiconductor. Within the MoS₂ bandgap wavelength, the choice of design can be used to increase the photocurrent via the enhanced electric field of surface plasmons. Beyond the bandgap, hot electrons generated by surface plasmons can contribute to the photocurrent, which overcomes the limitation of the semiconductor's bandgap. Using a finite element method simulation, we determined the optimal geometric configuration for the grating and metal parameters...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Ahmad A Darweesh, Stephen J Bauman, Desalegn T Debu, Joseph B Herzog
We propose and report on the design of a 1-D metallo-dielectric nano-grating on a GaAs substrate. We numerically study the impact of grating period, slit and wire widths, and irradiating angle of incidence on the optical response. The optimal wire width, w = 160 nm, was chosen based on previous results from investigations into the influence of wire width and nano-slit dimensions on optical and electrical enhancements in metal-semiconductor-metal photodetectors. In this present project, resonant absorption and reflection modes were observed while varying the wire and nano-slit widths to study the unique optical modes generated by Rayleigh-Wood anomalies and surface plasmon polaritons...
October 9, 2018: Nanomaterials
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
Anne C Berends, Johannes D Meeldijk, Marijn A van Huis, Celso de Mello Donega
Colloidal 2D semiconductor nanosheets (NSs) are an interesting new class of materials due to their unique properties. However, synthesis of these NSs is challenging, and synthesis procedures for materials other than the well-known Pb- and Cd-chalcogenides are still underdeveloped. In this paper, we present a new approach to make copper indium sulfide (CIS) NSs and study their structural and optical properties. The CIS NSs form via self-organization and oriented attachment of 2.5 nm chalcopyrite CuInS2 nanocrystals (NCs), yielding triangular- and hexagonal-shaped NSs with a thickness of ∼3 nm and lateral dimensions ranging from 20 to 1000 nm...
December 26, 2017: Chemistry of Materials: a Publication of the American Chemical Society
Zhixin Zhou, Xia Liu, Liang Yue, Itamar Willner
Nucleic acid-based constitutional dynamic networks (CDNs) attract growing interest as a means to mimic complex biological networks. The triggered stabilization of the CDNs allows the dictated guided reversible reconfiguration and re-equilibration of the CDNs to other CDN configurations, where some of the constituents are up-regulated, while other constituents are down-regulated. Although substantial progress in controlling the adaptive dynamic control of the compositions of networks by means of auxiliary triggers was demonstrated, the use of CDNs as active ensembles for controlling chemical functionalities is still a challenge...
October 1, 2018: ACS Nano
Minmin Wang, Ping Wang, Chuanping Li, Haijuan Li, Yongdong Jin
Ultrathin metal-organic frameworks (MOFs) nanosheets with large active sites and superior catalytic properties have attracted extensive interests and are promising for oxygen evolution reaction (OER) for water splitting. Herein, we report a novel and highly efficient hetero-nanostructured OER system based on plasmonic AuNPs and ultrathin semiconductor-like Co/Ni-MOF nanosheets. The OER performance of the hybrid system can be tuned (by varying the AuNP sizes) and the oxidation current significantly enhanced to ~ 10-fold with incorporated AuNPs of ~ 20 nm...
September 26, 2018: ACS Applied Materials & Interfaces
Zhenyi Zhang, Yang Liu, Yurui Fang, Baosheng Cao, Jindou Huang, Kuichao Liu, Bin Dong
Plasmonic metal nanostructures have been widely used to enhance the upconversion efficiency of the near-infrared (NIR) photons into the visible region via the localized surface plasmon resonance (LSPR) effect. However, the direct utilization of low-cost nonmetallic semiconductors to both concentrate and transfer the NIR-plasmonic energy in the upconversion system remains a significant challenge. Here, a fascinating process of NIR-plasmonic energy upconversion in Yb3+ /Er3+ -doped NaYF4 nanoparticles (NaYF4 :Yb-Er NPs)/W18 O49 nanowires (NWs) heterostructures, which can selectively enhance the upconversion luminescence by two orders of magnitude, is demonstrated...
September 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Carlos Alberto Huerta-Aguilar, Viviana Palos-Barba, Pandiyan Thangarasu, Ranjit T Koodali
In this paper, we report the combination of two metal oxides (TiO2 ZnO) that allows mixed density of states to reduce band gap energy, facilitating the photo-oxidation of Congo red dye under visible light. For the oxidation, a possible mechanism is proposed after analyzing the intermediates by GC-MS, and it is consistent with Density Functional Theory (DFT). The nanohybrids were characterized comprehensibly by several analytical techniques such as X-Ray diffraction (XRD), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and X-ray Photoelectron Spectroscopy (XPS)...
December 2018: Chemosphere
Meysam Keshavarz, Bo Tan, Krishnan Venkatakrishnan
Accurate in vitro molecular-level analysis is an essential step prior to in vivo and clinical application for early diagnosis and cancer treatment. Among the diagnostic techniques, surface-enhanced Raman scattering (SERS) biosensing has shown growing potential due to its noninvasive and real-time characterization of the biomolecules. However, the application of SERS biosensing is mostly limited to the plasmonic noble metals, in the form of either nanoparticles or tips and substrates (fixed probe), on which surface plasmon resonance (SPR) is the prominent enhancement principle...
October 3, 2018: ACS Applied Materials & Interfaces
Jiaji Cheng, Yiwen Li, Marie Plissonneau, Jiagen Li, Junzi Li, Rui Chen, Zikang Tang, Lauriane Pautrot-d'Alençon, Tingchao He, Mona Tréguer-Delapierre, Marie-Hélène Delville
Compared to the limited absorption cross-section of conventional photoactive TiO2 nanoparticles (NPs), plasmonic metallic nanoparticles can efficiently convert photons from an extended spectrum range into energetic carriers because of the localized surface plasmon resonance (LSPR). Using these metal oxide semiconductors as shells for plasmonic nanoparticles (PNPs) that absorb visible light could extend their applications. The photophysics of such systems is performed using transient absorption measurements and steady extinction simulations and shows that the plasmonic energy transfer from the AgNWs core to the TiO2 shell results from a hot carrier injection process...
September 20, 2018: Scientific Reports
Xuejiao Wang, Xupeng Zhu, Huimin Shi, Yiqin Chen, Zhiquan Chen, Yixuan Zeng, Zhixiang Tang, Huigao Duan
Seeking for ultrasensitive and low-cost substrates is highly demandable for practical applications of surface-enhanced Raman scattering (SERS) technology. In this work, we report an ultrasensitive SERS-active substrate based on wet-chemistry-synthesized vertically aligned large-area TiO2 nanosheets (NSs) decorated by densely packed gold nanoparticles (Au NPs) with sub-5 nm gaps. Via a multistep successive deposition process, three-dimensional-stacked Au NPs sandwiched by a 3 nm SiO2 layer were assembled onto the TiO2 NS, enabling numerous hotspots due to the formation of both ultratiny plasmonic gaps and semiconductor/metal interfaces...
October 4, 2018: ACS Applied Materials & Interfaces
G McConnell, S Mabbott, A L Kanibolotsky, P J Skabara, D Graham, G A Burley, N Laurand
Organic semiconductor lasers are a sensitive biosensing platform that respond to specific biomolecule binding events. So far, such biosensors have utilized protein-based interactions for surface functionalization but a nucleic acid-based strategy would considerably widen their utility as a general biodiagnostic platform. This manuscript reports two important advances for DNA-based sensing using an organic semiconductor (OS) distributed feedback (DFB) laser. First, the immobilization of alkyne-tagged 12/18-mer oligodeoxyribonucleotide (ODN) probes by Cu-catalyzed azide alkyne cycloaddition (CuAAC) or "click-chemistry" onto an 80 nm thick OS laser film modified with an azide-presenting polyelectrolyte monolayer is presented...
October 1, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yaoran Liu, Linhan Lin, Bharath Bangalore Rajeeva, Jeremy W Jarrett, Xintong Li, Xiaolei Peng, Pavana Kollipara, Kan Yao, Deji Akinwande, Andrew K Dunn, Yuebing Zheng
Optical manipulation of colloidal nanoparticles and molecules is significant in numerous fields. Opto-thermoelectric nanotweezers exploiting multiple coupling among light, heat, and electric fields enables the low-power optical trapping of nanoparticles on a plasmonic substrate. However, the management of light-to-heat conversion for the versatile and precise manipulation of nanoparticles is still elusive. Herein, we explore the opto-thermoelectric trapping at plasmonic antennas that serve as optothermal nanoradiators to achieve the low-power (∼0...
September 27, 2018: ACS Nano
X X Wang, C X Xu, F F Qin, Y J Liu, A G Manohari, D T You, W Liu, F Chen, Z L Shi, Q N Cui
Zinc (Zn) surface plasmons (SPs) have been widely reported for their impressive performance in improving the optical properties of semiconductors. Zn is an effective metal with SPs response in the ultraviolet region, but the disadvantage of strong metal activity limits the application mentioned above. Here, in order to ensure the stability of metal Zn, ZnO/Zn microspheres were synthesized by an one-step laser ablation method to distribute Zn nanoparticles simultaneously on both inner and outer surfaces of ZnO microspheres...
September 27, 2018: Nanoscale
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