Projekta nosaukums: Uz pašorganizējošiem peptīdiem balstītu bioloģiski saderīgu enerģijas ieguves sistēmu izstrāde
Pētniecības pieteikuma nr: 1.1.1.9/LZP/1/24/018
Projekta ilgums: 01.04.2025.-31.03.2028.
Projekta vadītājs: Suvankar Mondal
Kopējais finansējums: EUR 185 510
LU CFI finansējums: EUR 9275,50
Projekta kopsavilkums:
Jauniem hibrīdiem nanoģeneratoriem (HNG) no bioloģiski saderīgiem, elastīgiem materiāliem tiek pievērsta liela uzmanība dēļ to augstās ģenerētās elektriskās jaudas un plašām pielietojumu perspektīvām elektroniskajā industrijā. Pieaugošais pieprasījums pēc apkārtējais videi draudzīgiem elektroniskajiem materiāliem, kuri ir viegli izgatavojami un optimizējami ar ķīmisku modificēšanu, ir motivējis pašorganizējušu peptīdu nanocaurulīšu pētījumu attīstību.
Galvenie projekta mērķi:
sintezēt un raksturot pašorganizējošas peptīdu nanocaurulītes un plānās kārtiņas;
izveidot un pārbaudīt HNG, kas izgatavoti uz pašorganizējošu peptīdu mikrostruktūru bāzes, noskaidrojot to enerģijas iegūšanas un pašuzlādējošu sensoru perspektīvas;
izveidot bio-sensorus, kas reģistrē ārējas vides izmaiņas (temperatūra, pH, šķīdinātāji u.c.).
PROJEKTA PROGRESS
12.11.2025.
During this period, recent studies on peptide-based piezoelectric biomaterials were reviewed, emphasizing the development of biocompatible energy-harvesting systems using self-assembled diphenylalanine (FF) dipeptide films. The review provided detailed insights into synthesis routes, self-assembly mechanisms, piezoelectric performance, and potential applications in biosensing, biomedical implants, and self-powered electronic systems. There were also analyzed different thin-film fabrication methods (drop-casting, inkjet printing, dip-coating, spin-coating, and vapor-phase self-assembly) to identify the most effective route for achieving uniform crystalline alignment and improved piezoelectric response. Based on these findings, the experimental methodology for fabricating FF thin films and their characterization was outlined.
Crystalline FF films were fabricated through a two-step process. First, amorphous FF films were prepared from an HFIP-based solution (50 mg/mL) by spin-coating at 5000 rpm for 60 seconds under low humidity (<30%) to prevent premature crystallization. These amorphous films were then crystallized in a climatic chamber at 30 °C and 90% relative humidity for two hours, which promoted molecular ordering and uniform film morphology. The FF films were deposited on both conductive Si and glass substrates, exhibiting regions with needle-like crystallites and large crystalline plates.
Dielectric characterization was performed using Au and Cr electrodes deposited by magnetron sputtering. Measurements were carried out in the temperature range of −120 °C to 50 °C and frequency range of 130 Hz to 1 MHz, using a LINKAM sample cell connected to precision impedance analyzers. Proper electrical connections and low-capacitance coaxial cables minimized parasitic effects, while automated temperature control ensured reliable data acquisition.
The results showed that most Au contacts had low resistivity, while FF films on glass exhibited higher resistivity and reduced hysteresis near 0 °C. Overall, significant progress was achieved in understanding FF thin-film fabrication, crystallinity, and dielectric behavior, providing a strong foundation for future work on peptide-based piezoelectric energy harvesters.