Radiolytic production and properties of ultrasmall cadmium sulfide particles

Abstract

The radiolytic production of CdS particles from solutions containing cadmium ions and a thiol (3-mercapto-1,2-propanediol, RSH) is described. The production of the colloids is initiated by the reaction of solvated electron with the thiol to release HS" ions. The polynuclear complexes of cadmium with the thiolate form of RSH act as moderators to the growth of the particles and allow reproducible production of practically any predetermined size particles. The complexes at the surface of the particles also stabilize the particles for long periods of time. The particles are strongly fluorescent from size of ca. 8 Á in radius. Excess electrons in these particles lead to bleaching of the exciton band due to Coulomb screening effects. At higher doses, formation of cadmium atoms leads to increased absorption in the visible range.

Photocatalytic Degradation of Azo Dye (Methyl Red) In Water under Visible Light Using Ag-Ni/TiO2 Sythesized by /- - Irradiation Method

“…Various methodsfor the synthesis of modified TiO2photocatalyst included precipitation [8] , hydrothermal, solvothermal [9], chemical vapour deposition [10], and electrospinning [11] , radiolysis [12]. Among several methods for modified nanopowder TiO2, radiolysis method using-irradiation is advantageous because the experiment can be carried out at very mild conditions, ambient pressure and room temperature with high reproducibility and it is the unique method [13,14,15]. In addition, Zhang et al (2010) [16] also synthesized Ag-Ni alloy nanoparticles by radiolytic method.…”

Efficient Near‐Infrared Electrochemiluminescence from CdTe Nanocrystals with Low Triggering Potential and Ultrasensitive Sensing Ability

“…[18] To explore the role of wide-band-gap CdS shells on the ECL emission of NIR-emitting NCs, a biothiol compound, namely, glutathione (g-l-glutamyl-l-cysteineglycine, GSH), was used as the model molecule to form Cd À S bonds at the surface of the as-prepared CdTe NCs. As shown in Figure 3 B, the decreased ECL of the as-prepared CdTe NCs upon addition of GSH should be due to the replacement of HMP by GSH at the binding sites on the NCs surface; [19] this makes the hole injection onto the CdTe surface more difficult.…”

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

“…Limiting the attention to wet chemistry approaches, a wide plethora of synthetic routes has been proposed in the literature to prepare metal sulphide colloids ranging from non-aqueous sol-gel routes [70][71][72][73], hydro/solvothermal [24,[74][75][76][77][78][79][80][81][82][83][84][85][86], to sono- [19, and radiochemistry [111][112][113][114][115][116][117], laser ablation [118,119], micro- [120][121][122][123][124][125][126][127][128][129][130] and miniemulsion synthesis [131][132][133][134][135][136][137][138], seeded-growth [139] and nucleation/g...…”