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Description
TCI E1457 Selenium (Powder), CAS number 7782-49-2, is elemental selenium supplied in powder form and prepared for electronic materials research, particularly as a precursor for colloidal quantum dots. Selenium is a chalcogen group element that serves as an essential component in a wide range of semiconductors, including cadmium selenide, zinc selenide, lead selenide, and silver selenide. In routine laboratory practice, selenium powder is first dissolved or reacted with phosphine compounds or long-chain amines to form a reactive precursor solution used in nanocrystal synthesis.
The powder form is chosen because it offers a large surface area, so dissolution and precursor formation proceed more rapidly and more uniformly than they would with lump or shot material. Selenium also has a relatively low melting point for a solid element and readily forms complexes with trioctylphosphine, a characteristic that underpins the widely used hot injection synthesis method. Elemental purity is a critical factor in optoelectronic applications, because even trace quantities of metallic impurities can introduce lattice defects and degrade the optical performance of the resulting nanocrystals.
In Indonesian laboratories, this material is typically handled by university research groups, government research institutes, and materials science laboratories working on quantum dot synthesis, thin film semiconductors, and optoelectronic device development. It is normally weighed inside a glove box or under an inert atmosphere and used in Schlenk line work, where precursor solutions are prepared fresh before each nanocrystal synthesis run.
Laboratory Applications
Colloidal quantum dot synthesis — the powder dissolves readily in coordinating solvents to give the selenium precursor solution required for controlled nucleation and growth of nanocrystals.
Cadmium selenide nanocrystal preparation — supplies the chalcogen source for the classic CdSe system, where uniform precursor concentration governs the final particle size distribution and emission wavelength.
Zinc selenide and core–shell structures — serves as the selenium source when growing ZnSe shells or alloyed interfaces that passivate the core and improve overall photoluminescence stability.
Lead selenide and infrared-active materials — provides elemental selenium for PbSe systems studied in near-infrared detection and photovoltaic research, where precursor purity directly affects device response.
Hot injection precursor chemistry — its ready complexation with trioctylphosphine makes it well suited to the rapid injection protocols that separate nucleation from growth in quantum dot work.
Pack sizes: available in the standard research-scale pack sizes offered by the manufacturer; please confirm the size required when ordering
Storage: keep in a tightly closed container in a cool, dry, well-ventilated place away from incompatible materials
Handling and Storage
Store the container tightly closed in a cool, dry and well-ventilated area, protected from moisture and from sources of ignition or heat. Original manufacturer bottles or chemically compatible glass containers with secure closures are suitable; transfer into a clean, dry vessel if smaller working quantities are needed. Handle the powder in a fume hood or glove box to avoid generating or inhaling dust, and wear gloves, safety glasses and a laboratory coat. Keep it separated from strong oxidizing agents, and observe the manufacturer's safety data sheet together with your institution's chemical waste procedures for disposal of residues and contaminated consumables.
