Bulk quantities of defect-free silicon (Si) nanowires with nearly uniform diameters ranging from 40 to 50 angstroms were grown a length several micrometers supercritical fluid solution-phase approach. Alkanethiol-coated gold nanocrystals (25 in diameter) used as seeds direct one-dimensional Si crystallization solvent heated and pressurized above its critical point. The orientation the produced this method could be controlled reaction pressure. Visible photoluminescence due quantum...

A new synthetic method was developed to produce robust, highly crystalline, organic-monolayer passivated silicon (Si) nanocrystals in a supercritical fluid. By thermally degrading the Si precursor, diphenylsilane, presence of octanol at 500 degrees C and 345 bar, relatively size-monodisperse sterically stabilized ranging from 15 40 diameter could be obtained significant quantities. Octanol binds nanocrystal surface through an alkoxide linkage provides steric stabilization hydrocarbon chain....

Au nanoparticles with diameters ranging between 15 and 170 nm have been synthesised in aqueous solution using a seed-mediated growth method, employing hydroxylamine hydrochloride as reducing agent. Thiolated polyethylene glycol (mPEG-SH) polymers, molecular weights from 2100 to 51 000 g mol−1, were used efficient particle stabilising ligands. Dynamic light scattering zeta potential measurements confirmed that the overall mean diameter of capped increased non-linear way increasing weight...

Semiconductor nanowires have been the subject of intensive research investment over past few decades. Their physical properties afford them applications in a vast network active microelectronic fields, including logic device scaling very large scale integrated circuits, sensor devices, and energy harvesting. A range routes to semiconductor nanowire production opened up as result advances fabrication techniques last number These can usually be categorized into one two paradigms, bottom-up or...

Mesoporous titania nanotubes with tunable dimension have been fabricated within the pores of alumina membranes by a simple sol-gel templating method. The 3D network structures these mesoporous (see figure) can provide both electron pathway and lithium ion which benefit their applications in high rate rechargeable battery.

Metallic nanowires of cobalt, copper, and iron oxide magnetite (Fe3O4) have been synthesized within the pores mesoporous silica using a supercritical fluid inclusion technique. The matrix provides means producing high density stable, hexagonally ordered arrays highly crystalline nanowires. formation metal mesopores was confirmed by transmission electron microscopy (TEM), N2 adsorption experiments, powder X-ray diffraction (PXRD). mechanism nanowire appears to occur through initial binding...

Ceria (CeO2) has many important applications, notably in catalysis. Many of its uses rely on generating nanodimensioned particles. redox chemistry where Ce4+ cations can be reversibly reduced to Ce3+ and associated anion vacancies. The significantly larger size (compared with Ce4+) been shown result lattice expansion. authors have observed expansion crystals (nanocrystals), these attributed the presence stabilized Ce3+−anion vacancy combinations systems. Experimental results presented here...

Nanostructured materials are central to the evolution of future electronics and information technologies. Ferroelectrics have already been established as a dominant branch in sector because their diverse application range such ferroelectric memories, tunnel junctions, etc. The on-going dimensional downscaling allow packing increased numbers components onto integrated circuits provides momentum for nanostructured devices. Nanoscaling can result modification functionality, phase transition...

The reactivity of various lanthana powders in air was studied. materials rapidly hydroxylate to form a stable hydroxide, La(OH) 3 , at room temperature. Smaller amounts an oxycarbonate species (La 2 O CO ) are also observed following exposure. This phase is hydroxylation. All oxide synthesized here show rapid reactions so that 24 h exposure atmosphere generally sufficient cause complete hydroxylation rate reaction related the crystallite size as determined by XRD. found follow two‐stage...

Summary This study assessed the film‐forming abilities of six types proteins, as well polysaccharides at various concentrations (proteins: 0–16%; polysaccharides: 0–4%) and heating temperatures (60–80 °C). Biopolymer films evaluated included: sodium caseinate (SC), whey protein isolate (WPI), gelatine (G); caboxymethyl cellulose (CMC), alginate (SA) potato starch (PS). Screening trials showed that optimal conditions were achieved using SC G (4% 8%), WPI (8% 12%), PS, CMC (2% 3%) or SA (1%...

Block copolymers (BCPs) and their directed self-assembly (DSA) has emerged as a realizable complementary tool to aid optical patterning of device elements for future integrated circuit advancements. Methods enhance BCP etch contrast DSA application further potential applications inorganic nanomaterial features (e.g., semiconductor, dielectric, metal oxide) are examined. Strategies modify, infiltrate controllably deposit materials by utilizing neat self-assembled thin films open rich design...

Abstract The shape sensitivity of Pd catalysts in Suzuki–Miyaura coupling reactions is studied using nanocrystals enclosed by well‐defined surface facets. catalytic performance with cubic, cuboctahedral and octahedral morphologies are compared. Superior reactivity observed for NCs {100} facets compared to {111} origin the enhanced associated a cubic morphology related leaching susceptibility nanocrystals. Molecular oxygen plays key role facilitating atoms from interaction O 2 itself...

Abstract The development of non-equilibrium group IV nanoscale alloys is critical to achieving new functionalities, such as the formation a direct bandgap in conventional indirect elemental semiconductor. Here, we describe fabrication uniform diameter, Ge 1− x Sn alloy nanowires, with incorporation up 9.2 at.%, far excess equilibrium solubility bulk Ge, through catalytic bottom-up growth paradigm using noble metal and catalysts. Metal catalysts permitted greater inclusion nanowires compared...

Since the isolation of two-dimensional (2D) phosphorene, black phosphorus (BP) has gained popularity due to its high carrier mobility and tunable bandgap. Poor ambient stability BP remains a key issue impedes use in electronic applications. Here we report new stabilization strategy based on covalent functionalization liquid exfoliated few-layer using aryl iodonium salts. Arylation salts enables modification without inducing oxidation alters degradation chemistry by inhibiting bridged oxygen...

An organic passivation process for nitride nanowires was first proposed to reduce Shockley–Read–Hall non-radiative recombination of nanowire light emitting diodes.

Nitrogen dioxide (NO2) is a gaseous air pollutant linked to respiratory and cardiovascular diseases environmental problems such as acid rain tropospheric ozone formation. Reference instruments for measuring NO2 are expensive, highlighting the need develop low cost sensor technologies wider scale monitoring of this critical pollutant. Here, we report development scalable using electrochemically exfoliated 2D molybdenum disulfide (MoS2) networks. The can detect wide range concentrations at...

Abstract Direct synthesis (co‐condensation reaction) and post‐synthesis reaction (grafting) are combined for the first time to efficiently fabricate bifunctionalized ordered mesoporous materials (OMMs). Ethylenediamine‐containing OMMs (ED‐MCM‐41) were synthesized via direct then further modified by phenyl (PH) group in a supercritical fluid (SCF) medium grafting reaction, resulting with ED PH groups (PH‐ED‐MCM‐41). X‐ray diffraction (XRD) patterns, N 2 sorption properties, transmission...

Semiconducting nanowires (NWs) are important "building blocks" for potential electrical and electromechanical devices. Here, we report on the mechanical properties of supercritical fluid-grown Ge NWs with radii between 20 80 nm. An analysis bending tensile stresses during deformation failure reveals that while have a Young's modulus comparable to bulk value, they an ultimate strength 15 GPa, which is maximum theoretical these materials. This exceptional highest reported any conventional...