研究目的
To predict and measure the piezoelectric properties of DL-alanine single crystals and polycrystalline aggregates, demonstrating that net molecular chirality is not necessary for piezoelectric behavior in organic crystals and exploring applications in energy harvesting and sensing.
研究成果
DL-alanine crystal films exhibit significant piezoelectric properties with an average d33 constant of 4.0 pC/N and maximum open circuit voltage of 0.8 V under compression, demonstrating that chirality is not essential for piezoelectricity. These crystals are suitable for applications in biosensors, flexible electronics, and energy harvesters, with potential for high performance in stack actuation and structural health monitoring.
研究不足
The polycrystalline film response is a combined d31, d32, and d33 response due to random crystal orientations, diluting the maximum predicted single crystal response. The fracture point of organic crystals is lower compared to piezoceramics, limiting stress applications. Nonuniform release during manual compression causes variation in voltage measurements.
1：Experimental Design and Method Selection:
Density functional theory (DFT) was used to predict piezoelectric tensors. Macroscopic and nanoscopic piezoelectric measurements were guided by modeling data.
2：Sample Selection and Data Sources:
DL-alanine single crystals and polycrystalline aggregates were grown using methods such as dropcasting and spin coating on substrates like copper and ITO glass.
3：List of Experimental Equipment and Materials:
Equipment includes a commercial d33 piezometer, transmission x-ray diffraction, scanning electron microscopy (SEM), piezoresponse force microscopy (PFM), multimeter, LABVIEW collection routine, conductive silver paint, and substrates (copper, ITO glass). Materials include DL-alanine, isopropyl alcohol.
4：Experimental Procedures and Operational Workflow:
Crystals were grown in 25% isopropyl alcohol. Piezoelectric response was measured using a d33 piezometer and PFM. Open circuit voltage was measured under manual compression with wires attached using conductive silver paint and a multimeter.
5：Data Analysis Methods:
Data were analyzed using DFT calculations, statistical analysis of piezoelectric constants, and LABVIEW for voltage recording.
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