Preparations and luminescent properties of PbS nanoparticle phosphors incorporated in a SiO₂ matrix

Abstract

A synthetic route for the preparation of luminescent PbS nanoparticles encapsulated in SiO2 at room temperature by the sol‐gel process is presented. The particle size and morphology of the PbS nanoparticles were observed by transmission electron microscopy (TEM). The particle sizes were estimated from the X‐ray diffraction (XRD) peaks using the Scherrer's equation. The measured particle sizes were in the range of 10 to 50 nm inside the SiO2 matrix. The cathodoluminescence (CL) measured with a Fiber Optics PC2000 spectrometer showed the emission peak to be at the wavelength of 680 nm. The phosphor was degraded in an oxygen atmosphere. The chemical composition of the prepared samples was analyzed by an energy dispersive spectrometer (EDS). X‐ray photoelectron spectrometer (XPS) was used to measure the surface chemical composition of the SiO2:PbS nanoparticles before and after electron degradation. XPS analysis on the degraded spot showed the development of characteristic SiO, SiOx and elemental Si peaks on the low‐energy side of the SiO2 peak. The desorption of O2 from the surface, which resulted in a decrease in the CL intensity is attributed to the dissociation of SiO2 into elemental Si and O by the electron bombardment. The degradation was less severe at higher oxygen pressures. PbSO4 was also formed on the surface during the electron beam degradation process. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Trifunctional Electrolyte Additive Hexadecyltrioctylammonium Iodide for Lithium–Sulfur Batteries with Extended Cycle Life

“…PbO/SiO 2 nanoparticles were prepared through a sol–gel method. , Tetraethyl orthosilicate (TEOS) was added to the mixture of water, glycerol, nitric acid (HNO 3 ), acetic acid (HAc), and lead acetate (Pb­(Ac) 2 ) and then hydrolyzed at room temperature. The molar ratio was H 2 O/glycerol/HNO 3 /HAc/Pb­(Ac) 2 /TEOS = 20:1:0.02:1:0.04:1.…”

“…PbO/SiO 2 nanoparticles were prepared through a sol−gel method. 36,37 Tetraethyl orthosilicate (TEOS) was added to the mixture of water, The sol was stirred until the gel is formed, and finally, the gel was calcined in a muffle furnace at 550 °C for 2 h. After cooling to room temperature, the PbO/SiO 2 nanoparticles were obtained.…”

Sulfide Sensor Based on Room-Temperature Phosphorescence of PbO/SiO2 Nanocomposite

“…The nanometer particles of PbO/SiO 2 were prepared by the sol−gel method. , TEOS was hydrolyzed at room temperature with a mixed solution of H 2 O, C 3 H 8 O 3 , HNO 3 , HAc, and Pb(AC) 2 in molar ratios of 20:1:0.02:1:0.04 per mole of TEOS. ( Warning : lead and its compounds are highly toxic when eaten or inhaled; please wear a respirator and gloves to prevent being poisoned, and take back the waste residue .)…”

Synthesis and luminescent properties of PbS/SiO2 core-shell quantum dots

“…Для большинства составов коллоидных КТ управление оптическими переходами с участием ловушечных состояний в КТ достигается за счет формирования оболочки на поверхности КТ из широкозонных полупроводников (структуры ядро/оболочка) [17,[36][37][38]. Формирование структур ядро/оболочка на основе КТ PbS, в частности КТ PbS/SiO 2 , мало изучено [27,[39][40][41]. Тогда как формирование оболочек SiO 2 на интерфейсах КТ способствует не только «залечиванию» структурно-примесных дефектов КТ, участвующих в формировании люминесцентных свойств, но и обеспечивает управление монодисперсностью КТ в ансамбле, повышение коллоидной стабильности КТ, снижение цитотоксичности [17,27,[36][37][38][39][40][41].…”

“…Формирование структур ядро/оболочка на основе КТ PbS, в частности КТ PbS/SiO 2 , мало изучено [27,[39][40][41]. Тогда как формирование оболочек SiO 2 на интерфейсах КТ способствует не только «залечиванию» структурно-примесных дефектов КТ, участвующих в формировании люминесцентных свойств, но и обеспечивает управление монодисперсностью КТ в ансамбле, повышение коллоидной стабильности КТ, снижение цитотоксичности [17,27,[36][37][38][39][40][41]. Таким образом, управление люминесцентными свойствами КТ PbS, в том числе за счет формирования структур ядро/оболочка на их основе, является актуальной задачей, решение которой впоследствии откроет перспективу создания на их основе материалов и устройств для современных приложений нанофотоники.…”