Jin Ho Bang

Recent advances in nanostructured materials have been led by the development of new synthetic methods that provide control over size, morphology, and nano/microstructure. The utilization of high intensity ultrasound offers a facile, versatile synthetic tool for nanostructured materials that are often unavailable by conventional methods. The primary physical phenomena associated with ultrasound that are relevant to materials synthesis are cavitation and nebulization. Acoustic cavitation (the form

CdSe and CdTe nanocrystals are linked to nanostructured TiO2 films using 3-mercaptopropionic acid as a linker molecule for establishing the mechanistic aspects of interfacial charge transfer processes. Both these quantum dots are energetically capable of sensitizing TiO2 films and generating photocurrents in quantum dot solar cells. These two semiconductor nanocrystals exhibit markedly different external quantum efficiencies ( approximately 70% for CdSe and approximately 0.1% for CdTe at 555 nm)

Abstract One‐dimensional (1D) nanostructures of TiO 2 are grown directly on transparent, conductive glass substrate using hydrothermal/solvothermal methods. When employed as a photoanode in photoelectrochemical cells, the vertically aligned TiO 2 nanorod array exhibits slower charge recombination at electrolyte interface as compared to mesoscopic TiO 2 particulate film. Electrochemical deposition of CdSe onto TiO 2 nanorod array is carried out to extend absorption into visible light region. The

Nanosized hollow iron oxide was synthesized using high-intensity ultrasound with carbon nanoparticles as a template. The hollow iron oxide was characterized by TEM, STEM, EELS, XRD, Raman, Mössbauer, and SQUID analyses. The TEM examination, EDS, and EELS analyses demonstrated the formation of iron oxide with nanosized hollow cores. XRD, Raman, and Mössbauer studies revealed that the hollow iron oxide is the most thermodynamically stable iron oxide, hematite (α-Fe2O3). Magnetization measurements

The development of organic/inorganic hybrid nanocomposite systems that enable efficient solar energy conversion has been important for applications in solar cell research. Nanostructured carbon-based systems, in particular C(60), offer attractive strategies to collect and transport electrons generated in a light harvesting assembly. We have assembled CdSe-C(60) nanocomposites by chemically linking CdSe quantum dots (QDs) with thiol-functionalized C(60). The photoinduced charge separation and col

The preparation of visible-light-absorbing nanostructured ZnS:Ni2+ photocatalysts using ultrasonic spray pyrolysis (USP) is presented. The nanoparticles are significantly more active and stable towards H2 evolution from aqueous K2SO3 and Na2S solution than conventional ZnS:Ni2+ powders, owing to their good crystallinity and high surface area. This demonstrates the utility of USP in the preparation of highly active photocatalysts. Supporting information for this article is available on the WWW un

A general method has been developed for the preparation of microspheres of nanoporous pigments, their formulation into chemically responsive pigment inks, and the printing of these inks as colorimetric sensor arrays. Using an ultrasonic-spray aerosol-gel synthesis from chemically responsive dyes and common silica precursors, 16 different nanoporous pigment microspheres have been prepared and characterized. New colorimetric sensor arrays have been created by printing inks of these chemically resp

Carbon powders composed of porous micrometer-sized spheres were synthesized from simple organic salt precursors using ultrasonic spray pyrolysis (USP). These materials were tested as catalyst supports for a direct methanol fuel cell (DMFC) catalyst and as pore formers in a membrane electrode assembly (MEA). The effect of these materials on unit cell performance was evaluated and compared to traditional Vulcan XC-72 carbon nanoparticle powder. USP provides a simple and facile way to prepare porou

Hierarchically nanostructured titanium nitride is prepared via a novel and facile in situ dual templating approach. No prestructured templates are necessary; instead, a template is generated in situ during the synthesis from a liquid core and the resulting spherical shell, and the template is removed in the final heating without any additional chemical etching. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTReliable Counter Electrodes for the Hydrogen Evolution Reaction in Acidic MediaJunghyun LeeJunghyun LeeDepartment of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of KoreaMore by Junghyun Lee and Jin Ho Bang*Jin Ho BangDepartment of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of KoreaDepartment of Chemical and Molecular Engine

A recent surge of interest in metal (oxy)nitride materials for energy storage devices has given rise to the rapid development of various nanostructuring strategies for these materials. In supercapacitor applications, early transition metal (oxy)nitrides have been extensively explored, among which titanium oxynitride stands out due to its great potential for charge storage. Despite recent advances in supercapacitors based on titanium oxynitride, many underlying factors governing their capacitive

Recently, gold nanoclusters (Au NCs) have become more popular as their structure–property relationships start to rival those of conventional Au NPs. The molecular-type energy transition and quantum confinement effects of Au NCs are fundamentally different from those of Au NPs. Because of these intriguing features, Au NCs are gaining special attention in catalysis research and are being used as model catalysts to understand catalytic properties and structures at the atomic level. Although catalys

CdTeSe and CdTeS ternary quantum dots (QDs) that fluoresce in the red to near-IR regions have been prepared using chemical aerosol flow synthesis (CAFS). Changing the composition ratio of Te to Se permits bandgap tuning of CdTeSe QDs, and replacing selenium with sulfur in the precursor solution increased the quantum efficiency of CdTe QDs up to ∼37%, because of better surface passivation of the CdS outer shell that grows on top of the CdTe core. ICP-MS and XPS analyses showed the internal struct