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Silicon nanoparticles

E Tiguntseva, A Chebykin, A Ishteev, R Haroldson, B Balachandran, E Ushakova, F Komissarenko, H Wang, V Milichko, A Tsypkin, D Zuev, W Hu, S Makarov, A Zakhidov
Recently, hybrid halide perovskites have emerged as one of the most promising types of materials for thin-film photovoltaic and light-emitting devices because of their low-cost and potential for high efficiency. Further boosting their performance without detrimentally increasing the complexity of the architecture is critically important for commercialization. Despite a number of plasmonic nanoparticle based designs having been proposed for solar cell improvement, inherent optical losses of the nanoparticles reduce photoluminescence from perovskites...
August 17, 2017: Nanoscale
Yuxiang Qin, Diao Liu, Tianyi Zhang, Zhen Cui
Surface functionalization is very effective in enhancing sensing properties of a chemiresistive gas sensor. In this work, we develop a novel and cost-effective process to prepare Ag-modified silicon nanowire (SiNW) sensors and further suggest a resistance effect model to clarify the enhanced sensing mechanism of Ag-modified SiNWs. The SiNWs were formed via metal-assisted chemical etching (MACE), and the Ag nanoparticle (NP) modification was achieved in situ based on the MACE-produced Ag dendrites by involving a crucial anisotropic postetching of TMAH...
August 16, 2017: ACS Applied Materials & Interfaces
Grzegorz Kwiatkowski, Fabian Jähnig, Jonas Steinhauser, Patrick Wespi, Matthias Ernst, Sebastian Kozerke
Hyperpolarized silicon particles have been shown to exhibit long spin-lattice relaxation times at room temperature, making them interesting as novel MRI probes. Demonstrations of hyperpolarized silicon particle imaging have focused on large micron size particles (average particle size (APS) = 2.2 μm) as they have, to date, demonstrated much larger polarizations than nanoparticles. We show that also much smaller silicon-29 particles (APS = 55 ± 12 nm) can be hyperpolarized with superior properties...
August 11, 2017: Scientific Reports
T Ikonen, T Nissinen, E Pohjalainen, O Sorsa, T Kallio, V-P Lehto
Silicon is being increasingly studied as the next-generation anode material for Li-ion batteries because of its ten times higher gravimetric capacity compared with the widely-used graphite. While nanoparticles and other nanostructured silicon materials often exhibit good cyclability, their volumetric capacity tends to be worse or similar than that of graphite. Furthermore, these materials are commonly complicated and expensive to produce. An effortless way to produce nanostructured silicon is electrochemical anodization...
August 11, 2017: Scientific Reports
Wen-Jeng Ho, Ruei-Siang Sue, Jian-Cheng Lin, Hong-Jang Syu, Ching-Fuh Lin
This paper reports impressive improvements in the optical and electrical performance of metal-oxide-semiconductor (MOS)-structure silicon solar cells through the incorporation of plasmonic indium nanoparticles (In-NPs) and an indium-tin-oxide (ITO) electrode with periodic holes (perforations) under applied bias voltage. Samples were prepared using a plain ITO electrode or perforated ITO electrode with and without In-NPs. The samples were characterized according to optical reflectance, dark current voltage, induced capacitance voltage, external quantum efficiency, and photovoltaic current voltage...
August 10, 2016: Materials
Wen-Jeng Ho, Jian-Cheng Lin, Jheng-Jie Liu, Chien-Wu Yeh, Hong-Jhang Syu, Ching-Fuh Lin
In this study, we sought to improve the light trapping of textured silicon solar cells using the plasmonic light scattering of indium nanoparticles (In NPs) of various dimensions. The light trapping modes of textured-silicon surfaces with and without In NPs were investigated at an angle of incidence (AOI) ranging from 0° to 75°. The optical reflectance, external quantum efficiency (EQE), and photovoltaic performance were first characterized under an AOI of 0°. We then compared the EQE and photovoltaic current density-voltage (J-V) as a function of AOI in textured silicon solar cells with and without In NPs...
July 1, 2017: Materials
Suxia Ren, Lili Dong, Xiuqiang Zhang, Tingzhou Lei, Franz Ehrenhauser, Kunlin Song, Meichun Li, Xiuxuan Sun, Qinglin Wu
Nanofibers with excellent activities in surface-enhanced Raman scattering (SERS) were developed through electrospinning precursor suspensions consisting of polyacrylonitrile (PAN), silver nanoparticles (AgNPs), silicon nanoparticles (SiNPs), and cellulose nanocrystals (CNCs). Rheology of the precursor suspensions, and morphology, thermal properties, chemical structures, and SERS sensitivity of the nanofibers were investigated. The electrospun nanofibers showed uniform diameters with a smooth surface. Hydrofluoric (HF) acid treatment of the PAN/CNC/Ag composite nanofibers (defined as p-PAN/CNC/Ag) led to rougher fiber surfaces with certain pores and increased mean fiber diameters...
January 14, 2017: Materials
Chih-Hui Lo, Teh-Min Hu
The morphology of particles, along with other particle attributes, has been shown to affect the biological fate of particles administered into the body. Particles with collapsed surfaces or shells (dimpled, buckled or crumpled) can have different appearances, under the microscope, that resemble many things encountered in our daily life, such as apples/cherries, doughnuts, and bowls. Recent studies have demonstrated that they are not just particles with interesting geometries, but they can also be used as functional blocks for assembled complex materials...
August 3, 2017: Soft Matter
Naveed Hussain, Tongxiang Liang, Qingyun Zhang, Tauseef Anwar, Ya Huang, Jiangliang Lang, Kai Huang, Hui Wu
Despite substantial progress in the science and technology of 2D nanomaterials, facile fabrication of ultrathin 2D metals remains challenging. Herein, an efficient hot-pressing method is developed to fabricate free-standing ultrathin Bi nanosheets from Bi nanoparticles. Highly crystalline Bi nanosheets with thickness as low as ≈2 nm and area of more than several micrometers are successfully fabricated on silicon substrates. The ultrathin Bi nanosheets exhibit morphology and structural dependent enhanced broad range photoemission in visible region of spectrum...
August 1, 2017: Small
Thawatchart Chulapakorn, Ilya Sychugov, Sethu Saveda Suvanam, Jan Linnros, Daniel Primetzhofer, Anders Hallen
The influence of swift heavy ion (SHI) irradiation on the photoluminescence (PL) of silicon nanoparticles (SiNPs) and defects in SiO<sub>2</sub>-film is investigated. SiNPs were formed by implantation of 70 keV Si<sup>+</sup> and subsequent thermal annealing to produce optically active SiNPs and to remove implantation-induced defects. Seven different ion species with energy between 3-36 MeV and fluence from 10<sup>11</sup>-10<sup>14</sup> cm<sup>-2</sup> were employed for irradiation of the implanted samples prior to the thermal annealing...
July 26, 2017: Nanotechnology
Peter E Petrochenko, Jiwen Zheng, Brendan J Casey, M Reza Bayati, Roger J Narayan, Peter L Goering
Porous PMMA is a versatile biomaterial with good biocompatibility but high susceptibility to bacterial colonization, which we mitigated by utilizing immobilized antimicrobial silver nanoparticles (AgNPs). A uniform porous thin film was deposited onto silicon wafers by simultaneously ablating PMMA and silver (Ag) using pulsed laser deposition (PLD) optimized for minimal human cell toxicity and antibacterial efficacy. PMMA without Ag became heavily colonized by E. coli in simulated dynamic conditions, while Ag-containing samples prevented all colonization...
July 21, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
Heejun Jang, Il-Suk Kang, Jihye Kim, Jonghyun Kim, Yun Jeong Cha, Dong Ki Yoon, Wonhee Lee
Despite the importance of nanofluidic TEM chips, a simple fabrication method has yet to be developed due to the difficulty of wafer bonding techniques using a nanoscale thick bonding layer. We present a simple and robust wafer scale bonding technique using parylene as a bonding layer. A nanoscale thick parylene layer was deposited on a SiN wafer and patterned to construct nanofluidic channels. The patterned parylene layer was directly bonded to another SiN wafer by thermal surface activation and bonding, with a bonding strength of ~3 MPa...
July 24, 2017: Nanotechnology
Andrew P Cádiz Bedini, Benjamin Klingebiel, Martina Luysberg, Reinhard Carius
Silicon nanoparticles (Si-NPs) are increasing in relevance in diverse fields of scientific and nanotechnological inquiry, where currently some of the most important areas of research involve energy storage and biomedical applications. The present article is concerned with a curious and scalable method for the preparation of discrete, unoxidized, hydrogenated, and amorphous Si-NPs of tunable size in the range of 1.5-50nm. Using ultrasound generated with a conventional ultrasonic horn, the "fusion" of Si-NPs is demonstrated at ambient temperature and pressure by sonicating solutions containing readily available, semiconductor-grade purity trisilane (Si3H8)...
November 2017: Ultrasonics Sonochemistry
Pei Huang, Han-Qiao Shi, Hong-Mei Xiao, Yuan-Qing Li, Ning Hu, Shao-Yun Fu
The mismatch of refractive index (RI) between light emitting diode (LED) chips and packaging resins severely lowers the lighting emitting efficacy of LED. The RI can be enhanced by the introduction of high RI nanoparticles but meanwhile it is a great challenge to maintain the high transparency for resins due to the agglomeration of nanoparticles. In this work, a facile strategy is proposed to fabricate silicone nanocomposites with a high transparency (>88%, less than 2% decrease relative to pure silicone resin), largely enhanced RI (an increase from 1...
July 20, 2017: Scientific Reports
Muhammad Amjad, Yang Yang, Ghulam Raza, Hui Gao, Jun Zhang, Leping Zhou, Xiaoze Du, Dongsheng Wen
The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments...
July 8, 2017: Journal of Colloid and Interface Science
Hao Cui, Shuoyu Li, Shaozhi Deng, Huanjun Chen, Chengxin Wang
We demonstrated a flexible transparent and free-standing Si nanowire paper (SiNWP) as a surface enhanced Raman scattering (SERS) platform for in situ chemical sensing on warping surfaces with high sensitivity. The SERS activity has originated from the three-dimension interconnected nanowire network structure and electromagnetic coupling between closely separated nanowires in the SiNWP. In addition, the SERS activity can be highly improved by functionalizing the SiNWP with plasmonic Au nanoparticles. The hybrid substrate not only showed excellent reproducibility and stability of the SERS signal, but also maintained the flexibility and transparency of the pristine SiNWP...
March 24, 2017: ACS Sensors
Fransiska S H Krismastuti, Melissa R Dewi, Beatriz Prieto-Simon, Thomas Nann, Nicolas H Voelcker
We report on the design and testing of photonic biosensors for the type-selective detection of different types of matrix metalloproteinases (MMPs). The ability to detect a panel of different MMP types has important implications for prognosis of wound healing. We combine the immunocapture of MMPs on dispersed magnetic nanoparticles modified with antibodies specific for target MMPs (immuno-magNPs) with subsequent MMP detection upon fluorogenic peptide cleavage in porous silicon resonant microcavity (pSiRM) architectures...
February 24, 2017: ACS Sensors
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics, owing to their thinness and softness. While most of them are based on thin metal films, a silicon membrane, or nanoparticle-based printable inks, we report sub-micrometer thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed as filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ∼85%, and a stretchability of more than 40%...
July 27, 2017: ACS Nano
Robson Rosa da Silva, Mauricio Cavicchioli, Lais Rocalho de Lima, Caio Gomide Otoni, Hernane da Silva Barud, Silvia Helena Santagneli, Agnieszka Tercjak, André Capaldo Amaral, Renata Aquino Carvalho, Sidney José Lima Ribeiro
In this work we explored the fabrication of flexible and transparent hybrids of silk fibroin and epoxy modified siloxane for photonic applications. It is well known that regenerated silk fibroin (SF) solutions can form free-standing films with high transparency. Although SF has a restricted number of chemically reactive side groups, the main issues of as-casted pristine SF films regard the high solubility into aqueous media, brittleness, and low thermal stability. The design of SF films with enhanced functionality but yet highly transparent triggers new opportunities on broader range of applications in biophotonics...
July 17, 2017: ACS Applied Materials & Interfaces
Mónica P A Ferreira, Sanjeev Ranjan, Sini Kinnunen, Alexandra Correia, Virpi Talman, Ermei Mäkilä, Brianda Barrios-Lopez, Marianna Kemell, Vimalkumar Balasubramanian, Jarno Salonen, Jouni Hirvonen, Heikki Ruskoaho, Anu J Airaksinen, Hélder A Santos
Ischemic heart disease is the leading cause of death globally. Severe myocardial ischemia results in a massive loss of myocytes and acute myocardial infarction, the endocardium being the most vulnerable region. At present, current therapeutic lines only ameliorate modestly the quality of life of these patients. Here, an engineered nanocarrier is reported for targeted drug delivery into the endocardial layer of the left ventricle for cardiac repair. Biodegradable porous silicon (PSi) nanoparticles are functionalized with atrial natriuretic peptide (ANP), which is known to be expressed predominantly in the endocardium of the failing heart...
July 17, 2017: Small
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