Ammonia-sensitive halide CsCuI film for gas sensor and stimuli-responsive anti-counterfeiting.

Eco-friendly lead-free halide perovskites have emerged as promising materials for multiple applications due to their unique optoelectronic properties. In this work, we investigate the ammonia (NH)-sensitive CsCuI film for its potential in NH sensor and stimuli-responsive fluorescence anti-counterfeiting. CsCuI-based NH sensor demonstrates a high response to NH (△R/R = 1.

Surface Reconstruction of CsPbBr Nanocrystals by the Ligand Engineering Approach for Achieving High Quantum Yield and Improved Stability.

Oleylamine/oleic acid (OAm/OA) as the commonly used ligand is indispensable in the synthesis of perovskite nanocrystals (PNCs). Unfortunately, poor colloidal stability and unsatisfactory photoluminescence quantum yield (PLQY) are observed, resulting from a highly dynamic binding nature between ligands. Herein, we adopt a facile hybrid ligand (DDAB/ZnBr) passivation strategy to reconstruct the surface chemistry of CsPbBr NCs.