Biomineralization of PbS and PbS–CdS core–shell nanocrystals and their application in quantum dot sensitized solar cells

Abstract

Biomineralization is demonstrated as a facile aqueous route to the synthesis of PbS and PbS–CdS core–shell quantum dot nanocrystals.

Enzymatic biomineralization of biocompatible CuInS2, (CuInZn)S2and CuInS2/ZnS core/shell nanocrystals for bioimaging

“…We have previously reported biomineralization of PbS/ CdS core/shell particles through the sequential addition of pre- cursors. 34 Incubation of CSE in a buff ered solution of zinc acetate and L-cysteine leads to the formation of an absorption peak at 280 nm, Fig. S6, † in agreement with reports of ZnS nanoparticle formation.…”

“…34,35 These latter materials will directly form a metal sulfide solid upon reaction with the reactive sulfur, likely H2S, formed by the enzymatic turnover of L-cysteine by the putative cystathio-nine γ-lyase class CSE enzyme. 28 In contrast, reaction with indium nitrate forms a relatively stable species with a charac-teristic absorption peak at 290 nm, which has previously been identified as a molecular cluster of indium and sulfur, 46 rather than bulk or nanocrystalline In2S3.…”

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

“…[ 282 ] Biomineralized PbS and PbS–CdS core–shell nanocrystals induced by Stenotrophomonas maltophilia are used in quantum‐dot‐sensitized experimental solar cells to harvest more energy. [ 283 ] Biomineralization of γ‐FeOOH using the Gram‐negative iron‐oxidizing bacteria, Acidovorax sp. BoFeN1 strain, has been used to prepare α‐Fe 2 O 3 bacteriomorphs.…”

Single enzyme direct biomineralization of ZnS, ZnxCd1−xS and ZnxCd1−xS–ZnS quantum confined nanocrystals

“…2 We are pursuing an alternative and more direct approach to biomineralization whereby we isolate, engineer and in a scalable fashion produce a single enzyme that is responsible for the generation of the reactive chemical precursor from an otherwise inert solution and also plays a key role in templating nanomaterial formation. [10][11][12][13][14] We have previously demonstrated the application of a putative cystathionine g-lyase, smCSE, in the direct biomineralization of CdS, [10][11][12] PbS and PbS-CdS coreshell 13 quantum conned nanocrystals and an engineered form of silicatein for the biomineralization of CeO 2Àd and Ce 1Àx Zr x O 2Àd catalytic nanocrystals. 14 In this work, we demonstrate the activity role of smCSE towards the biomineralization of ZnS, Zn x Cd 1Àx S and Zn x Cd 1Àx S-ZnS quantum conned nanoparticles.…”