Abstract
The present work is devoted to find a simple, inexpensive, and efficient synthesis for PbS. Nanoparticles and nanostructured thin films of lead sulfide are synthesized in short reaction times by using physicochemical methods at room conditions or similar ones. Also, a simple laboratory equipment and a basic experimental configuration is used. PbS was synthesized without ammonium or ammonia. The main precursors used in both syntheses are lead acetate, as lead source, polyethyleneimine, as a complexing agent, and thioacetamide, as a sulfur source. Acetylacetone has been employed as a dispersant agent to elaborate PbS nanoparticles, while the sodium hydroxide maintains a high pH, to elaborate PbS thin films. Characterizations reveal the existence of PbS nanoparticles whose size is smaller than 10 nm and with a bandgap of 3.35 eV. On the other hand, the resulting thin film is composed of PbS little crystallites of 22 nm with a homogeneous profile and its bandgap is 1.85 eV.
Highlights
The semiconductors are materials used in different electronic devices, according to their electronic properties, like bandgap or conductivity, for example
3.1 PbS nanoparticles This section begins with characterizations of nanoparticles leading to the formal identification of the synthesized chemical compound, Figure 1 displays a set of micrograph images coming from transmission electron microscopy, the images 1a1c correspond to three different work scale as is indicated, a kind of branched behavior adopted for the small cluster is observed at this sequence
We have presented a successful process to elaborate PbS nanoparticles with an aqueous solution reaction at room conditions in 10 minutes
Summary
The semiconductors are materials used in different electronic devices, according to their electronic properties, like bandgap or conductivity, for example. The PbS is a chalcogenide material that can change these properties by reducing its size to nanometric scales. The PbS can be employed in devices like solar cells, LEDs, photocatalysis, photoluminescence, or infrared photodetectors. There are reported applications for PbS on photocell as patent since 1948 by R. PbS quantum dots have been used as contrast materials in laboratory studies in tumors, checking their low cytotoxicity, there are researches related to this [6]. There are different methods of synthesis, for example, Khan et al reported the deposition of PbS thin films via aerosol assisted chemical vapor deposition [7]. Mechanochemical synthesis of PbS nanocrystals from lead oxide [8] and, a chemical synthesis for PbS nanoparticles [9] were reported
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