Electrogenerated chemiluminescence (ECL) was observed from TOPO-capped CdSe nanocrystals dissolved in CH2Cl2 containing 0.1 M TBAP. The solution of monodisperse with an absorption maximum at 537 nm synthesized 330 °C using TOPO (trioctylphosphineoxide) and TOP (trioctylphosphine) as capping agents Cd-acetate Se powder precursors. photoluminescence (PL) spectrum showed emission 545 nm. Cyclic voltammetry differential pulse this displayed no distinctive features, but light through the...

Differential pulse voltammetry (DPV) of TOPO-capped CdTe nanoparticles (NPs) in dichloromethane and a mixture benzene acetonitrile showed two anodic one cathodic peaks the NPs themselves an additional peak resulting from oxidation reduced NPs. The electrochemical band gap (∼2.1 eV) between first DPV was close to value (2 obtained absorption spectrum. Electrogenerated chemiluminescence (ECL) highly intense for scans into negative potential region dichloromethane. fact that ECL occurs at about...

The electrogenerated chemiluminescence (ECL) spectrum of CdSe/ZnSe nanocrystals (NCs) dispersed in a CH2Cl2 solution containing 0.1 M TBAP was obtained by stepping the potential between +2.3 and −2.3 V. Unlike spectra from ECL Si or CdSe NCs, where emission occurs single peak that is significantly red-shifted photoluminescence (PL) (attributed to surface states), produced two peaks: sharp whose position almost identical PL another broader with red shift ∼200 nm compared PL. This suggests...

An unusual enhancement of photoluminescence from CdSe nanocrystals (NCs) dispersed in air-saturated CHCl3 was observed as a function time. Within two weeks, for samples kept the dark, intensity increased by much factor 6, based on peak height, with no change position or width. This can be attributed to reaction dissolved oxygen, which results surface passivation. NCs growth solution (TOP/TOPO) showed increase.

Organic layer capped Ge nanocrystals (NCs) were synthesized by an arrested-growth method within supercritical octanol. Electrogenerated chemiluminescence (ECL) from the NCs dispersed in N,N'-dimethylformamide (DMF) containing 0.1 M tetra-n-butylammonium perchlorate (TBAP) was observed during potential scans or pulses through annihilation of electrogenerated oxidized and reduced species. The light emission intensity higher oxidation pulses, suggesting that forms more stable than ones. ECL...

The mechanistic aspects of a two-step method for the electrodeposition BiVO4 semiconductor (previously developed in Rajeshwar/Tacconi laboratory) were elaborated by combined application voltammetry and EQCM. electrosynthesized films also characterized ex situ using SEM, EDX, XRD, XPS. Stripping pre-electrodeposited bismuth films, followed reaction either with VO43− (formed hydrolysis from initially added VO3− species) or hydroxide ions, produced Bi2O3 thin on Pt electrode. deposition...

ConspectusMetal oxide semiconductors have many features that make them attractive for both fundamental and applied studies. For example, these compounds contain elements (e.g., Fe, Cu, Ti, etc.) are derived from minerals rendering earth-abundant and, most often, also not toxic. Therefore, they been examined possible applicability in a very diverse range of technological applications including photovoltaic solar cells, charge storage devices, displays, smart windows, touch screens, etc. The...

A sensor is demonstrated that capable of spatial discrimination cyanide with use only a single stationary sensing element. Different regions the element are light activated to reveal solution concentration at point illumination. In this addressable photoelectrochemical (LAP) consists an n-CdSe electrode immersed in solution, open-circuit potential determined under alkaline ferro-/ferricyanide photopotential highly responsive cyanide, linear response (120 mV) log [KCN]. LAP detection...

A two-step electrosynthesis strategy was conceived and demonstrated for the preparation of films supported on Pt substrate. In first step, a Bi film electrodeposited substrate from an acidic medium. second this film, after transfer to medium containing (hydrolyzed) vanadium precursor, anodically stripped generate . situ precipitation then yielded The morphology surface/bulk composition were probed by scanning electron microscopy, energy-dispersive X-ray analysis, photoelectron spectroscopy....

Here, we prepared a cobalt–metal organic framework (MOF) by anodic electrodeposition at room temperature and transformed it first to Co3O4 calcination. The MOF-derived was then employed as sacrificial template fabricate CoSe films via anion exchange with NaHSe medium. Electrodeposited MOF showed uniform well-defined dodecahedral morphology particle size in the 3–4 μm range. retained original morphology, these morphological features were essentially preserved derived from exchange. Both...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaboratory Experiments on Electrochemical Remediation of the Environment: Electrocoagulation Oily WastewaterJorge G. Ibanez , Martha M. Takimoto Ruben C. Vasquez Sanjay Basak Noseung Myung and Krishnan Rajeshwar View Author Information University Texas at Arlington, TX 76019-0065Cite this: J. Chem. Educ. 1995, 72, 11, 1050Publication Date (Print):November 1, 1995Publication History Received3 August 2009Published online1 November 1995Published...

Nanocomposite films of Au-modified bismuth oxide (Au-Bi2O3) were synthesized via anodic electrodeposition Bi combined with a galvanic replacement reaction. First, Bi2O3 was prepared by the oxidation pre-electrodeposited in 0.1 M NaOH electrolyte. The amount metallic tuned controlling time or deposition potential. Thus-prepared Bi-Bi2O3 composite converted to Au-Bi2O3 galvanically replacing Au from an aqueous HAuCl4 solution. photocatalytic activity nanocomposite for decomposition methyl...

The mechanism of electrodeposition cobalt selenide (CoSe) thin films was investigated by the combined application linear sweep voltammetry (LSV) and electrochemical quartz crystal microgravimetry (EQCM) on Pt-coated electrodes. Cobalt were electrodeposited Pt surface from 0.1 M Na2SO4 electrolyte solution containing 5 mM SeO2 Co(CH3COO)2 voltammetry. Four cathodic waves observed during scans reactions corresponding to these with LSV EQCM. Combined stripping EQCM showed that CoSe via two...

Nanocomposite films of Pt-CuO were synthesized via galvanostatic electrodeposition combined with galvanic replacement and post-synthesis thermal anneal. First, Cu-Cu2O composite was prepared by electrodeposition; heat-treatment the as-prepared at 375°C for 10 h resulted in a CuO electrode showing response to glucose long term stability. Further enhanced obtained electrode, which mM PtCl4 solution 30 s followed annealing h. The resulting showed excellent alkaline an analytical sensitivity...

Recent advancements in aluminum materials and electrochemistry open a current density compatibility domain which anodes nickel oxide cathodes can simultaneously discharge at high faradaic efficiency. The resultant overlapping region permits demonstration of an aluminum/nickel battery capable unusually specific power energy

We report the electrochemical preparation of cadmium selenide nanoparticles at gold electrodes modified with molecular templates. The templates were obtained by properly arranging thiolated β-cyclodextrin self-assembled monolayers (SAMs) on electrodes. Selenium was first deposited a SAM-modified electrode an appropriate potential, followed reduction to in solution containing leading deposition CdSe. Cd codeposited time CdSe removed anodic dissolution potential where it oxidized. Scanning...

Bismuth telluride (Bi 2Te 3 ) is a benchmark material for thermoelectric power generation and cooling applications. Electrodeposition versatile technique preparing thin films of this material; however, it affords variable composition depending on the preparation history. A simple rapid assay electrodeposited films, therefore, has both fundamental practical importance. In study, new protocol electroanalysis Bi presented by combining two powerful complementary techniques electrochemical quartz...