High resolution XPS spectra of (a) Pb(4f) and (b) S(2p
A precise fit was obtained for two peaks at 161.3 eV and 166.8 eV, corresponding to the core levels of S 2+ in PbS. Cumulatively, XPS analysis confirms the film's primary composition as PbS,...
Room-temperature direct synthesis of semi-conductive PbS …
2019年11月13日 · According to X-ray photoelectron spectroscopy (XPS) analysis, as shown in Fig. 3a, b, the iodide to lead (I/Pb) ratio is 0.84 in a spin-coated film of PbS-I NCs, which is comparable to the...
XPS studies and factor analysis of PbS nanocrystal-doped SiO
1999年7月1日 · PbS nanocrystal-doped SiO 2 glass thin films and a single evaporated PbS film were studied by X-ray photoelectron spectroscopy (XPS) and factor analysis (FA). The composite films contained PbS crystallites with mean dimensions as small as 1–2 nm dielectrically embedded in the SiO 2 host.
The role of surface passivation for efficient and photostable PbS ...
2016年4月4日 · To identify the origin of the low efficiency, we performed surface X-ray photoelectron spectroscopy (XPS) to probe the species on the surface of the QDs for both EDT- and TBAI-treated QD...
XPS spectra of Pb4f before and after reduction. (a) Before …
XPS spectral analysis showed a 4.8 eV difference in binding energy between Pb 4f7/2 and Pb 4f5/2 for lead and lead oxide.
Size shift of XPS lines observed from PbS nanocrystals
2010年6月1日 · X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy are used to study Si nanocrystal formation in Si-implanted SiO2 films as a function of thermal annealing.
Surface chemistry of as-synthesized and air-oxidized PbS …
2018年11月1日 · XPS Pb 4f spectra show that when exposed to air, the peaks from the core PbS and surface Pb(RCOO) 2 and Pb(OH) 2 components, are accompanied by new peaks related to PbSO 3 and PbSO 4. Blue shifts and reduced luminescence from PbS QDs in air are correlated with surface oxidation, and are more pronounced for QD sizes with shapes that include (1 0 ...
铅 | Thermo Fisher Scientific - CN
XPS 光谱解读. Pb4f 区域具有明显的自旋轨道分裂峰 (Δ 金属 =4.87eV)。 铅金属 Pb4f 区域的谱峰峰形不对称。 对暴露于空气后的铅金属进行 O1s 区域分析，结果表明铅的天然氧化物中氢氧化铅的浓度较高。 基本信息说明
Optimizing Surface Chemistry of PbS Colloidal Quantum Dot for …
2020年11月27日 · Ligand exchange is performed on PbS colloidal quantum dots using conventional PbX2 ligands and KI3 additives via a facile one-step process, which simultaneously eliminate the undesirable sites and ef...
XPS-and-DFT analyses of the Pb 4f - ScienceDirect
2017年5月31日 · We used the appropriate XPS spectra of Pb-metal (Pb 0), α-PbO 2 (Pb 4+) and α-PbO (Pb 2+) XPS external standards for comparison and qualification of the Pb 4f core-levels structure of our samples. Our selection was justified by the relatively high stability of these lead compounds at normal ambient.