01703nas a2200205   4500008004100000022001400041245010200055210006900157260000800226300001400234490000800248520097000256653002501226653002301251653001701274653002701291100002001318700003101338856012801369       2024                        eng d  a0031-865500aOne-pot, easy and scalable synthesis of large-size short wave length IR emitting PbS quantum dots0 aOnepot easy and scalable synthesis of largesize short wave lengt  cJUL  a1020-10300 v1003 a<p>
	This study presents a versatile and efficient method to synthesize large-size lead sulfide (PbS) quantum dots (QDs) that display emission in the short-wave infrared (SWIR) region, using accessible and stable diethylammonium diethyldithiocarbamate (C-2)(2)DTCA and octylammonium octyldithiocarbamate (C(8)DTCA) as sulfur sources. As these sulfur sources enable the formation of well-dispersed, large-size PbS QDs in a very convenient way, this method can further be taken up for scale-up studies. Importantly, this approach allows precise control over QD sizes, thereby enhancing their SWIR optical properties. By adjusting the hot injection temperatures and sulfur source concentrations, different synthesis routes are explored, providing flexibility for the desired QD characteristics. The results presented here offer a promising opportunity to leverage the synthesized PbS QDs in applications such as optoelectronics, sensors, and imaging technology.</p>
10ahot injection method10aOptical properties10aquantum dots10ashort wave IR emission1 aSahu, Umasharan1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/one-pot-easy-and-scalable-synthesis-large-size-short-wave-length-ir-emitting-pbs-quantum02285nas a2200217   4500008004100000245009800041210006900139260000800208300001200216490000600228520156200234653002301796653001101819653001801830653001201848653001701860100001501877700001901892700003101911856012501942       2026                        eng d00aSelf-powered photodetection in AgBiS2 nanocrystals synthesized from AgBi-mixed-metal thiolate0 aSelfpowered photodetection in AgBiS2 nanocrystals synthesized fr  cJAN  a448-4560 v93 a<p>
	AgBiS2 has emerged as a promising optoelectronic material owing to its high absorption coefficient, environmentally friendly and abundant components, offering a sustainable alternative to lead- and cadmium-based chalcogenides. Realizing the full potential of AgBiS2 devices, however, requires scalable synthesis routes that include development of suitable precursors and minimize the use of harsh solvents, elevated temperatures, inert environments, etc. Here, we present a facile, solvent-free synthesis of phase pure AgBiS2 nanocrystals (NCs) at room temperature and under ambient conditions, enabled by the AgBi mixed-metal thiolate (AgBi-MMT) precursor complex. The initial choice of metal salts determines the nature of the metal thiolate intermediate complex, which subsequently influences the quality of the resulting AgBiS2 NCs. As a single-source precursor of the metals, AgBi-MMT enables controlled release of Ag+ and Bi3+ ions, yielding phase-pure AgBiS2 NCs. Furthermore, the MMT that is derived from AgI and BiI3 precursors promotes in situ surface passivation of the AgBiS2 NCs by iodide ions by trapping molecular I2 within its matrix. Under illumination, these iodide ions undergo reversible migration, generating a built-in potential and enabling self-powered photodetection in devices prepared from the as-synthesized NCs. This work expands the synthesis methodology of AgBiS2, highlighting the importance of metal thiolates as precursors in nanomaterial syntheses, and influence of iodine species in photo-operational devices.</p>
10abuilt-in potential10aiodine10aion migration10alayered10aquantum dots1 aDas, Mouli1 aSwathi, S., P.1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/self-powered-photodetection-agbis2-nanocrystals-synthesized-agbi-mixed-metal-thiolate