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Vortex flow induced self-assembly in CsPbI3 rods leads to an improved electrical response towards external analytes
Tufan Paul1, Avisek Maity2, Partha Bairi3
1Department of Physics, Indian Institute of Technology Gandhinagar, Palaj 382355, India. rupakb@iitgn.ac.in.
Dalton Transactions (Cambridge, England : 2003)
|March 15, 2024
Summary
We developed a simple method for self-assembling cesium lead iodide (CsPbI3) rods at an air-water interface. These aligned CsPbI3 rods show significantly enhanced ammonia gas sensing capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Cesium lead iodide (CsPbI3) perovskite materials are promising for optoelectronic applications.
- Controlling the self-assembly and orientation of CsPbI3 nanostructures is crucial for device performance.
- Existing methods for CsPbI3 assembly often require complex instrumentation.
Purpose of the Study:
- To develop a facile and versatile strategy for self-assembling CsPbI3 rods at an air-water interface.
- To investigate the influence of a rotational flow field on the alignment of CsPbI3 rods.
- To explore the ammonia sensing performance of aligned CsPbI3 rods.
Main Methods:
- Self-assembly of CsPbI3 rods at an air-water interface using vortex motion.
- Optimization of parameters including subphase temperature, CsPbI3 concentration, and rotational speed.
- Transfer of aligned CsPbI3 rods onto various substrates.
- Structural characterization using X-ray diffraction (XRD) with Rietveld refinement.
- Ammonia gas sensing measurements comparing aligned and non-aligned CsPbI3 rods.
Main Results:
- CsPbI3 rods successfully self-assembled and aligned at the air-water interface via controlled vortex motion.
- Optimized conditions led to high coverage of aligned CsPbI3 rods on glass substrates.
- Rietveld refinement confirmed the aligned CsPbI3 is in the pure orthorhombic phase (Pnma space group).
- Oleic acid acted as a surfactant, forming reverse micelle-like structures around the CsPbI3 rods.
- Aligned CsPbI3 rods demonstrated a 47-fold current increment in ammonia sensing, indicating 5.6 times higher sensitivity.
Conclusions:
- A simple and effective method for self-assembling and aligning CsPbI3 rods was established.
- The aligned CsPbI3 rods exhibit enhanced performance in ammonia gas sensing applications.
- This technique offers a pathway for fabricating oriented perovskite nanostructures on diverse substrates without complex equipment.
