Bio- and chemical sensing, biomaterials, in vivo electronics are some of the latest advances for porous silicon (p-Si) discussed this review. p-Si is extremely versatile owing largely to its well-known luminescence properties (the Figure shows photoluminescence from patterned p-Si), high surface area, facile synthesis, while recent techniques "soft" functionalization allow a level control over interfacial characteristics.

Block copolymer thin films can be used as soft templates for a wide range of surfaces where large area patterns nanoscale features are desired. The cylindrical domains acid-sensitive, self-assembled monolayers polystyrene-poly(2-vinylpyridine) block copolymers on silicon were utilized structural elements the production parallel metal nanowires. Metal ion loading P2VP with simple aqueous solutions anionic complexes is accomplished via protonation this basic block, rendering it cationic;...

Most discoveries in materials science have been made empirically, typically through one-variable-at-a-time (Edisonian) experimentation. The characteristics of materials-based systems are, however, neither simple nor uncorrelated. In a device such as an organic photovoltaic, for example, the level complexity is high due to sheer number components and processing conditions, thus, changing one variable can multiple unforeseen effects their interconnectivity. Design Experiments (DoE) ideally...

ADVERTISEMENT RETURN TO ISSUEPREVEnergy FocusNEXTLead-Free Perovskite Solar CellsPrashant V. Kamat, Juan Bisquert, and Jillian BuriakView Author Information University of Notre Dame, Indiana 46556, United States Universitat Jaume I, 12006 Castelló, Spain Alberta, Edmonton, Alberta T6G 2G2, CanadaCite this: ACS Energy Lett. 2017, 2, 4, 904–905Publication Date (Web):April 14, 2017Publication History Received20 March 2017Accepted20 2017Published online14 April inissue 14...

Redox flow batteries (RFBs) are promising energy storage candidates for grid deployment of intermittent renewable sources such as wind power and solar energy. Various new redox-active materials have been introduced to develop cost-effective high-power-density next-generation RFBs. Electrochemical kinetics play critical roles in influencing RFB performance, notably the overpotential cell density. Thus, determining kinetic parameters employed species is essential. In this Perspective, we...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLewis Acid Mediated Functionalization of Porous Silicon with Substituted Alkenes and AlkynesJillian M. Buriak Matthew J. AllenView Author Information Department Chemistry, 1393 Brown Laboratories Purdue University, West Lafayette, Indiana 47907-1393 Cite this: Am. Chem. Soc. 1998, 120, 6, 1339–1340Publication Date (Web):January 30, 1998Publication History Received25 November 1997Revised5 January 1998Published online30 inissue 1 February...

Lewis acid mediated hydrosilylation of alkynes and alkenes on non-oxidized hydride-terminated porous silicon derivatizes the surface with alkenyl alkyl functionalities, respectively. A very broad range chemical groups may be incorporated, allowing for tailoring interfacial characteristics material. The reaction is shown to protect stabilize surfaces from atmospheric or direct attack without compromising its valuable material properties such as high porosity, area visible room-temperature...

Silicon chips form the backbone of modern computing and yet until recently, surface chemistry this technologically essential material has remained relatively unexplored. As size devices on silicon wafers shrink (towards gigascale integration), characteristics play increasingly crucial roles in proper functioning device since ratio atoms/bulk escalates. While oxide served thus far as main passivation route, there is strong interest precisely tailoring interface properties, not only for...

A novel white light-promoted reaction using photoluminescent nanocrystalline silicon enables the hydrosilylation of alkenes and alkynes, providing stabilization porous without significant loss photoemissive qualities material. Photopatterning lithographic fabrication isolated structures are made possible. Experiments observations presented which indicate that light promoted is unique to silicon, does not function on nonemissive Hydrosilylation a reactive center generated from...

By illumination with white light porous silicon surfaces can be functionalized alkynes and alkenes (see scheme). The hydrosilylation reactions are very simple to perform lead stable, patterned surfaces. This methodology opens new opportunities in the technological applications of both integrated circuits sensors.

Thin noble metal films have been prepared as a result of the immersion germanium substrates into dilute, aqueous solutions AuCl4-, PdCl42-, or PtCl42-, respectively. Deposition proceeds via galvanic displacement in absence fluoride, pH adjusters, complexing agents, external reducing agents. This manner deposition serves cost-effective, high-throughput methodology with control over surface morphology and rate by modulation plating parameters such concentration, temperature, time.

Precise positioning of metallic nanostructures on semiconductor surfaces is important for applications such as photovoltaics, photoelectrocatalysis, metal interconnects, sensing platforms, and many others. In this paper, we demonstrate the utilization self-assembling diblock copolymer monolayer films, made up polystyrene-block-poly(2- or 4-vinylpyridine) (PS-b-P2VP PS-b-P4VP), to spatially direct an aqueous reduction reaction surfaces, a process call galvanic displacement. The forms...

Block copolymer self-assembly is an innovative technology capable of patterning technologically relevant substrates with nanoscale precision for a range applications from integrated circuit fabrication to tissue interfacing, example. In this article, we demonstrate microwave-based method rapidly inducing order in block structures. The technique involves the usage commercial microwave reactor anneal films presence appropriate solvents, and explore effect various parameters over polymer...

The cycling stability of Sb-based anodes for sodium-ion batteries can be greatly improved by adding Sn and Bi atoms in a substitutional solid solution with the host Sb lattice.

Silicon is the cornerstone material of semiconductor industry. As feature sizes on chips continue to decrease in size, ratio surface bulk increases, and as a result, role defects, states other subtle features play larger roles functioning device. Although silicon oxides have served industry well passivation chemistry choice, there interest expanding repertoire accessible efficient chemical functional strategies available for use, fully understand nature these interfaces. For new applications...

In light of the intense recent interest in methylammonium lead halides, CH3NH3PbX3 (X = Cl, Br, and I) as sensitizers for photovoltaic cells, dynamics (MA) cation these perovskite salts has been reinvestigated a function temperature via 2H, 14N, 207Pb NMR spectroscopy. cubic phase all three salts, MA undergoes pseudoisotropic tumbling (picosecond time scale). For example, correlation time, τ2, C-N axis iodide salt is 0.85 ± 0.30 ps at 330 K. The are essentially continuous across ↔ tetragonal...

Research into organic photovoltaics (OPVs) is rapidly growing worldwide because it offers a route to low temperature, inexpensive processing of lightweight, flexible solar cells that can be mass manufactured cheaply. Unlike silicon or other inorganic semiconductors (e.g., CdTe, CIGs), OPVs are complicated by the requirement having multiple materials and layers must integrated enable cell function. The enormous number research hours required optimize all aspects integrate them successfully...

Silver nanowire mesh electrodes represent a possible mass-manufacturable route toward transparent and flexible for plastic-based electronics such as organic photovoltaics (OPVs), light emitting diodes (OLEDs), others. Here we describe that is based upon spray-coated silver meshes on polyethylene terephthalate (PET) sheets are treated with straightforward combination of heat pressure to generate have low sheet resistance, good optical transmission, topologically flat, adhere well the PET...

The self-assembly of block copolymers to generate nanopatterns is great interest as an inexpensive approach sub-20 nm lithography. Compared thermal annealing, solvent vapor annealing has several intriguing advantages with respect the thin films copolymers, particularly for polymers high interaction parameters, χ, and molecular weights. In this methods paper, we describe a controlled flow system integrated in situ microscopy laser reflectometry, well feedback loop that automatically controls...