Heavy Atom Effect on Metallole Nanoaggregates and Their Explosive Sensing Applications

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Metallole nanoaggregates exhibit unique electronic and optical properties.
• Aggregation-induced emission enhancement (AIEE) is a key characteristic of these materials.
• Investigating heavy central atoms in metalloles is crucial for tuning their properties.

Purpose of the Study:

• To investigate the electronic and optical properties of metallole nanoaggregates with Germanium (Ge) and Tin (Sn).
• To measure photoluminescence (PL) properties, quantum yields (QY), and critical aggregation concentrations.
• To explore the application of these nanoaggregates in detecting trinitrotoluene (TNT).

Main Methods:

• Synthesis and characterization of metallole nanoaggregates.
• Measurement of amplified photoluminescence (PL) properties and absolute quantum yields (QY).
• Determination of critical aggregation concentrations and evaluation of TNT detection via PL quenching.

Main Results:

• The AIEE property diminishes with increasing atomic weight of the central atom (Ge to Sn).
• Metallole nanoaggregates effectively detected TNT through photoluminescence quenching.
• A linear Stern-Volmer relationship was observed, confirming reliable TNT detection.

Conclusions:

• The electronic and optical properties of metallole nanoaggregates are tunable by altering the central atom.
• These nanoaggregates demonstrate significant potential as sensitive sensors for TNT detection.
• The observed Stern-Volmer linearity supports the quantitative application of these sensors.