Reversible electrochemical injection of discrete numbers electrons into sterically stabilized silicon nanocrystals (NCs) (approximately 2 to 4 nanometers in diameter) was observed by differential pulse voltammetry (DPV) N,N'-dimethylformamide and acetonitrile. The gap between the onset electron hole injection-related highest occupied lowest unoccupied molecular orbitals-grew with decreasing nanocrystal size, DPV peak potentials above for roughly correspond expected Coulomb blockade or...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectrochemistry of CdS Nanoparticles: A Correlation between Optical and Electrochemical Band GapsSantosh K. Haram, Bernadette M. Quinn, Allen J. BardView Author Information Department Chemistry Biochemistry The University Texas at Austin, 78712 Cite this: Am. Chem. Soc. 2001, 123, 36, 8860–8861Publication Date (Web):August 18, 2001Publication History Received14 March 2001Revised15 June 2001Published online18 August inissue 1 September...

Nanoparticles of copper sulfide have been synthesized by reacting a ammonia complex with an equimolar thiourea solution in Triton-X 100/cyclohexane water-in-oil microemulsions. The presence exceptionally sharp and blue-shifted peak at 475 ± 2 nm the UV−vis spectrum reveals formation quasi-monodispersed, size-quantized particles. Using absorption spectroscopy, chalchocite (Cu2S) phase is inferred. position spectra was found to be independent net micellar water content as well aging effect. It...

Band structure parameters such as the conduction band edge, valence edge and quasi-particle gap of diffusing CdSe quantum dots (Q-dots) various sizes were determined using cyclic voltammetry. These are strongly dependent on size Q-dots. The results obtained from voltammetric measurements compared to spectroscopic theoretical data. fit reported calculations based semi-empirical pseudopotential method (SEPM)-especially in strong size-confinement region, is best so far, according our knowledge....

Cyclic voltammetry has been used as a tool to study the quantum confinement in oleic acid stabilized CdTe dot dispersions. The band structure parameters, conduction edge, valence and quasi-particle gap, have estimated function of size, ranging from ca. 2.4 4.7 nm compared with corresponding UV−vis data. To support experimental results, density functional theory (DFT) based calculations performed for passivated nonstoichiometric CdmTen (m≠n) clusters, using projector augmented wave method....

Earth-abundant quaternary chalcogenides are promising candidate materials for thin-film solar cells. Here we have synthesized Cu2NiSnS4 nanocrystals and thin films in a novel zincblende type cubic phase using facile hot-injection method. The structural, electronic, optical properties studied various experimental techniques, the results further corroborated within first-principles density functional theory based calculations. estimated direct band gap ∼ 1.57 eV high absorption coefficient 106...

MXenes have gained significant attention as layered two-dimensional (2D) materials by virtue of their favorable electrical conductivity and tunable surface properties. Herein, γ-radiolytic synthesis was carried out for the development Pt/Ti3C2Tx electrocatalyst via in situ generated reducing agents. Its characterization X-ray absorption spectroscopy (XAS) indicated strong metal–support interaction (SMSI) Pt with Ti3C2Tx, which is pivotal enhancing stability facilitating electron transfer...

This study explores and presents a comprehensive understanding of the synergistic effect in situ formed TiO2 Ti2C MXene (TTMXene) nanomaterials to derive enhanced energy characteristics high-performance flexible symmetric supercapacitors. The TTMXene two-dimensional (2D) (nanocomposite) materials were synthesized by simple single-step chemical etching method. thus exhibits layered structure with an average particle size range 10–50 nm. electrochemical studies demonstrate that nanocomposite...

In this report, we have systematically investigated the effect of SWCNTs on electrochemical performance BiVO₄: a material not studied thus far for energy storage.

Abstract We report the optimized synthesis and electrochemical characterization of a composite few-layered nanostructured MoS 2 along with an electroactive metal oxide BiVO 4 . In comparison to pristine , graphene/BiVO /BiVO nanocomposite provides impressive values charge storage longer discharge times improved cycling stability. Specific capacitance 610 Fg −1 (170 mAhg ) at 1 Ag 166 (46 10 were obtained for just 2.5 wt% loaded The results suggest that explicitly synthesized small...

Electrocatalytic oxidation of methanol on silica hollow spheres, loaded with platinum nanoparticles (Pt-SiO2-HS), is reported. The functionalized spheres were prepared by the surfactant (lauryl ester tyrosine) template-assisted synthesis. These γ-radiolysis. Energy-dispersive X-ray analysis (EDAX) and photoelectron spectroscopy (XPS) analyses confirmed presence Si Pt in composite. High-resolution transmission electron microscopy showed formation uniformly deposited over a predominant Pt(111)...

Cyclic voltammetry has been used to investigate the interaction between reduced graphene oxide (r-GO) and CdTe quantum dots (Q-CdTe). For that, composite of Q-CdTe with r-GO (r-GO-CdTe) was prepared by carrying out reduction synthesis simultaneously, in a single bath. r-GO-CdTe characterized UV–visible, steady state fluorescence, time-resolved X-ray diffraction (XRD), Raman, transmission electron microscopy (TEM). employed determine quasi-particle gap band edge parameters r-GO-CdTe. The blue...

The band gap bowing effect in oleic acid-stabilized CdSxSe1–x alloy quantum dots (Q-dots) with varying composition has been studied experimentally by means of cyclic voltammetry and theoretically using density functional theory based calculations. Distinct cathodic anodic peaks observed the voltammograms diffusing are attributed to respective conduction valence edges. quasi-particle values determined from voltammetric measurements compared interband transition UV–vis PL spectra. Electronic...

Graphene oxide (GO) synthesized from a modified Hummer's method was reduced (referred, rGO) by using 100 MeV Au ion species and its response to the sense H2O2 investigated. The changes in atomic composition structural properties of rGO after irradiation were studied x-ray diffraction, Fourier transform infrared spectroscopy photo-electron spectroscopy. These results suggested that removal oxygen-containing functional groups improvement electrochemical performance graphene (rGO) irradiation....

To improve the constraints of kesterite Cu2ZnSnS4 (CZTS) solar cell, such as undesirable band alignment at p–n interfaces, bandgap tuning, and fast carrier recombination, cadmium (Cd) is introduced into CZTS nanocrystals forming Cu2Zn1–xCdxSnS4 through cost-effective solution-based method without postannealing or sulfurization treatments. A synergetic experimental–theoretical approach was employed to characterize assess optoelectronic properties materials. Tunable direct gap energy ranging...

We report the novel use of scanning electrochemical microscope (SECM) to follow compression a monolayer monodisperse silver thiol-capped nanoparticles on Langmuir trough. SECM allowed direct visualization lateral connectivity particles in film at air/water interface through monitoring transition from negative feedback (insulating substrate) positive (conducting Pt tip, with ferrocene methanol (FcMeOH) as redox mediator, interparticle separation decreased by compressing film. The an...

Schematic representation of the preparation a MGP nanocomposite and its ultra-high stable supercapacitance.