Sub-10 nm S-Doped In₂O₃ Cubes Prepared via a Protein Hydrogel Space-Confined Strategy for ppb-Level Xylene Detection...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Current xylene-sensing materials face limitations due to size effects and electronic orbital configurations.
• Developing advanced materials with enhanced sensitivity and selectivity is crucial for effective environmental monitoring and industrial applications.

Purpose of the Study:

• To introduce a novel synthesis strategy for creating highly sensitive xylene-sensing materials.
• To overcome the limitations of existing sensing materials by utilizing protein hydrogels for spatial confinement.
• To enhance the performance of indium oxide (In2O3) based sensors through precise control over material properties.

Main Methods:

• Utilized protein hydrogels as a template to create spatially confined domains for material synthesis.
• Synthesized uniformly dispersed, sub-10 nm sulfur-doped indium oxide (S-doped In2O3) cubes, the smallest reported.
• Characterized the synthesized materials for their specific surface area, oxygen vacancy concentration, and electronic orbital configurations.

Main Results:

• Successfully prepared the smallest known In2O3 cubes (sub-10 nm) with uniform dispersion.
• Achieved an exceptionally low xylene detection limit of 5 parts per billion (ppb).
• Demonstrated that spatial confinement and S-doping effectively modulate electronic orbitals, enhancing adsorption and electron transfer.

Conclusions:

• The hydrogel-templated spatial confinement strategy is effective for preparing advanced sensing materials.
• Electron orbital modulation via size control and nonmetallic doping significantly enhances xylene sensing performance.
• This approach offers a novel pathway for developing highly sensitive and efficient cubic quantum dot-based sensing materials.