Luminescence Mechanism of Carbon-Incorporated Silica Nanoparticles Derived from Rice Husk Biomass

Abstract

In this work, silica-based luminescent materials containing different contents of carbon were synthesized from rice husk biomass. The intrinsic structure, chemical composition, as well as photoluminescent features were investigated. The results suggest that two forms of carbon, i.e., carbon that is chemically bonded and nonbonded with silica, exist in the structure of the as-prepared amorphous silica nanoparticles, which are believed to be responsible for the origin and quenching of photoluminescence, respectively. The generation of successive localized energy levels within the band gap of silica by the chemically bonded carbon is believed to be the luminescent mechanism. The insight into the photoluminescence of rice husk derived carbon-incorporated silica nanoparticles in this work would be valuable for researchers to further modify the luminescent features for practical applications.

Synthesis of Rice Husk Derived Activated Mesoporous Carbon Immobilized Palladium Hybrid Nano‐Catalyst for Ligand‐Free Mizoroki‐Heck/Suzuki/Sonogashira Cross‐Coupling Reactions

“…On the other hand, rice production associated with generation of huge amount of rice husks (RHs). RHs are tough in nature and have low nutritional value and were disposed by burning in the open field which results greenhouse gas emission and waste of huge amount of energy . Thus, search for sustainable applications of RHs are highly desirable in terms of economic and environmental concern.…”

Nanoporous Silicon as a Green, High-Tech Educational Tool

“…Luminescent Si nanocrystals have two clear advantages here (health and safety plus environmental) compared to highly toxic cadmium usage, provided we can avoid handling toxic hydrofluoric acid, as was discussed in Section 2 . Currently, reported biogenic silicon and silica nanostructures have primarily exhibited blue-green luminescence [ 63 , 64 , 65 ]. An example is shown in Figure 3 , where rice husks were calcined to a white powder that emitted blue light under UV.…”

“…Micropores can be utilized in controlling DNA transport; mesopores in antibody and protein delivery; macropores are of comparable size to viruses and bacteria; but cellular in-growth for vascular tissue interfacing requires pores of hundreds of microns diameter. By comparing the size domains of different silicon processing tools (lithography, micromachining, and electrochemical etching) with biological building [64] with permission of the American Chemical Society).…”

Versatile Nanostructures from Rice Husk Biomass for Energy Applications

“…RH‐NSs exhibit versatile optical, electronical, electrochemical, electromagnetic, surface, and mechanical properties. RH‐derived GQDs, carbon‐containing silica nanocomposites, carbon‐grafted ultrathin silica nanoparticles, as well as silicon carbide NSs have been confirmed to exhibit intense and tunable photoluminescence (PL). The PL of the above RH‐NSs is dependent on the synthesis conditions, and sensitive to the surrounding environment.…”