A Simple Method for Synthesis of PbS Nanoparticles Using 2-Mercaptoethanol as the Capping Agent

Abstract

Lead sulfide nanoparticles were synthesized at room temperature via a simple chemical reaction. In this synthesis, 2-mercaptoethanol was used as the capping agent and sodium sulfide was used as a sulfur source. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UVvis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy Electron microscopy study showed that without using a capping agent the bulk PbS is obtained, while adding the mercaptoethanol leads to production of nanoparticles. We found that the electronic absorption spectra as well as the particle sizes depend on the used capping agents. Two exitonic peaks with a large blue shift were observed when mercaptoethanol was used.

NANOPARTÍCULAS DE SULFETO DE CHUMBO (PbS): PREPARAÇÃO E CARACTERIZAÇÃO POR MET

“…O PbS é um semicondutor e nanopartículas semicondutoras demonstraram ser promissoras em aplicações como microeletrônica, optoeletrônica, óptica e foto catálise, podendo ser útil ainda em dispositivos eletroluminescentes como diodos emissores de luz, apresentando um gap direto de 0,41 eV e raio de Bohr do exciton de 18 nm à temperatura ambiente. (Nabiyouni, 2012).…”

“…Quando os tamanhos dos cristais são menores que o raio de Bohr, o exciton fica confinado em todas as três direções espaciais, um fenômeno chamado de efeito de confinamento quântico (Wu, 2023), se tornando um sistema interessante para estudar esse efeito, visto que propriedades ópticas e eletrônicas dos materias são dependentes do tamanho das partículas. (Nabiyouni, 2012). A utilização de materiais optoeletrônicos como os pontos quânticos coloidas (CQDs) demonstra ser promissor, e o uso de CQDs de sulfeto de chumbo estão emergindo como um material com boas expectativas para uso em dispositivos optoeletrônicos infravermelhos, incluindo fotodetectores e diodos emissores de luz, e como existe a necessidade de obtenção de uma alta qualidade, métodos de síntese vem sendo desenvolvidos, como a de uso de Ácido Oleico (AO) como ligante (Wu, 2023).…”

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

“…The ultimate objective is to create an extended absorption range that spans the entire solar spectrum, ranging from the ultraviolet (UV) to the IR. The synthesis of PbS and PbSe QDs typically involves costly reagents and sulfur/selenium sources that pose environmental risks. , In-situ synthesis processes circumvent these issues, offering a straightforward and high-yield production of thermally stable PbS and PbSe nanocrystals . Recent developments have introduced hybrid graphene/PbS QD phototransistors, , PbS/carbon nanotube (CNT) nanohybrids, − and PbS/MoX 2 (X = S, Se) phototransistors ,, as promising contenders in the realm of IR photovoltaic devices.…”

SYNTHESIS AND CHARACTERIZATION OF PbS NANOSTRUCTURES TO COMPARE WITH BULK

“…Recently researchers show interest in lead sulfide (PbS) nanoparticles due to its different structural, optical, photo conducting properties which cannot be availed from their bulk materials [1][2][3][4].PbS nanoparticles are much applicable in solar cell, photo detector, laser, LED etc for large Bohr exciton radius (20 nm) , shape as well as size tunable properties. Interestingly, group II-VI semiconductor nano particles are extensively used in nano devices [5][6][7].…”

“…Also PbS nano has thousand time greater optical response of same size CdS nano. A number of methods can be followed to grow PbS nanostructure [10][11][12][13][14][15].Some of the methods cause environmental hazards and required high temperature [16][17][18][19][20]. Aliphatic ligands have stabilizing and passivating property [21][22].…”