IR-Luminescent PbS−Polystyrene Nanocomposites Prepared from Random Ionomers in Solution

Abstract

Hybrid composites of PbS nanoparticles embedded in sulfonated polystyrene matrixes were prepared without other added capping agent in the random ionomer. The nanocomposites were found to exhibit photoluminescence in both the near-infrared and visible regions. The infrared luminescence was tunable in the range 1100-1500 nm via quantum size effect. XRD, TEM, UV-vis, FTIR, DSC, and XPS techniques were employed to investigate the size, shape, morphology, absorption, and thermal properties as well as the formation mechanism of nanoparticles in the ionomer matrix. The unique microstructure of the sulfonated polystyrene ionomer was found to provide a confined medium for the formation of nanoparticles. The -SO 3groups acted as the coordination sites for Pb 2+ ion aggregation, PbS nanoparticles were then successfully grown in situ at these sites with a supply of S 2from thioacetamide. The sizes and shapes of the PbS nanoparticles produced were controllable by varying the sulfonate content of the polymer and the initial feed concentration of Pb 2+ ions. The average size of PbS nanoparticles was estimated to be 5-8 nm, with size dispersity of ∼10-12%. Some PbS nanorods, with an average diameter of 3.5 nm, were formed at higher Pb/SO 3 H feed ratios.

Interfacial modification of hole transport layers for efficient large-area perovskite solar cells achieved via blade-coating

“…3c). The main peaks ranging from 136 eV to 141.5 eV consist of the 138.5 eV (Pb 2 þ ions in perovskite structure) and 139.9 eV (Pb 2 þ ions coordinated to ÀSO À 3 groups), respectively [29,30]. As increasing the PSSH ratio in M-PEDOT:PSS, the ratio of Pb (SO3) to Pb (perovskite) (Pb (SO3) /Pb (perovskite) ) increased from 0.09 to 0.70.…”

Properties of PbS Nanocrystals Synthesized by Sonochemical and Sonoelectrochemical Methods

“…Indeed, it is relatively easy to prepare particles of ∼18 nm size and it could be expected that these PbS nanoparticles will exhibit a strong quantum confinement effect. It was reported that the band gap of PbS can be widened to the visible region by forming nanoparticles [2][3][4][5][6]. PbS nanoparticles are hence promising materials in electroluminescent devices such as light-emitting diodes and luminescent display devices.…”

“…PbS nanoparticles are hence promising materials in electroluminescent devices such as light-emitting diodes and luminescent display devices. PbS nanostructures with different morphologies have been prepared including particles [3][4][5], wires [7], rods [6,8], tubes [9], and hollow spheres [10] by different methods such as wet chemistry [4,6,7], solvothermal [11], thermal decomposition [12], microwave irradiation [5], electrodeposition [13], sonochemical [5,9,10], and photochemical using UV-or γ-irradiation [3,14].…”

A simple one‐step chemical route to gold/polymer core/shell composites and polymer hollow spheres

“…[1][2][3] Moreover, they hold the longterm stability and will offer new routes to influencing the interactions that may take place between the matrix and the nanoparticle. 4,5 The clever combination of different nanoscale materials can lead to the development of multifunctional nanomaterials.…”