Synthesis and thermoelectric characterisation of bismuth nanoparticles

Abstract

An effective method of preparation of\ud bismuth nanopowders by thermal decomposition of\ud bismuth dodecyl-mercaptide Bi(SC12H25)3 and preliminary\ud results on their thermoelectric properties are\ud reported. The thermolysis process leads to Bi nanoparticles\ud due to the efficient capping agent effect of\ud the dodecyl-disulfide by-product, which strongly\ud bonds the surface of the Bi clusters, preventing their\ud aggregation and significantly reducing their growth\ud rate. The structure and morphology of the thermolysis\ud products were investigated by differential scanning\ud calorimetry, thermogravimetry, X-ray diffractometry,\ud 1H nuclear magnetic resonance spectroscopy, scanning\ud electron microscopy, and energy dispersive\ud spectroscopy. It has been shown that the prepared\ud Bi nanopowder consists of spherical shape nanoparticles,\ud with the average diameter depending on the\ud thermolysis temperature. The first results on the\ud thermoelectric characterization of the prepared Bi\ud nanopowders reveal a peculiar behavior characterized\ud by a semimetal–semiconductor transition, and a\ud significant increase in the Seebeck coefficient when\ud compared to bulk Bi in the case of the lowest grain\ud size (170 nm)

Nanocomposites Based on Metal and Metal Sulfide Clusters Embedded in Polystyrene

“…and most semi-metals (Sb) produce the metallic phase [20][21][22], according to the following reaction: Me(SR) 2 → Me + RSSR (2) The temperature required for thermal degradation depends on the degradation mechanism and usually it is higher in the case of sulfide formation. …”

Bismuth nanoparticles integration into heavy metal electrochemical stripping sensor

“…Various reducing agents, including ethylene glycol , sodium borohydride , aqueous hydrazine solution , ethylene‐diammine and, recently, sodium hyposphite have been used to prepare Bi crystals. The use of an organometallic complex of bismuth as a precursor for the decomposition also has been reported . In addition, photochemical activation has been used to synthesize BiNPs .…”

The synthesis of metallic and semiconducting nanoparticles from reactive melts of precursors

“…12,33 As with silver thiolates it is presumed that this redox reaction involves the reduction of Bi(III) to Bi(0) and the oxidation of thiols to radicals which combine to form disuldes. 33,34 The same Bi(SC 12 H 25 ) 3 precursor has been decomposed at higher temperatures (140-180 C for 3 minutes under vacuum) to give large spherical Bi nanoparticles. 34 In this study it was found that increasing the decomposition temperature reduced nanoparticle size and improved shape regularity.…”

“…33,34 The same Bi(SC 12 H 25 ) 3 precursor has been decomposed at higher temperatures (140-180 C for 3 minutes under vacuum) to give large spherical Bi nanoparticles. 34 In this study it was found that increasing the decomposition temperature reduced nanoparticle size and improved shape regularity. 34 Wang et al also studied Bi(SC 12 H 25 ) 3 as a precursor for the solventless synthesis of Bi nanoparticles.…”