Investigation of the Influence of Sensor Films Made of the Mycelium of Basidiomycetes on the Characteristics of a Me1/AlN/Me2/Diamond Ultrahigh-Frequency Resonator

Smirnov, A. V.; Asafiev, Nikita O.; Sorokin, B. P.; Ziangirova, M. Yu.; Golyshkin, Alexander; Krasnopolskaya, Tatyana S.; Kuznetsova, I. E.

doi:10.1134/s1064226920110169

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“…Further studies have shown that mycelium films can be used to create reusable acoustic humidity sensors [ 16 ]. It also was shown that mycelium films of higher fungi with thicknesses up to 1 µm can be used as sensor coatings for BAW resonators with an operating frequency up to 3.5 GHz [ 17 ]. However, the studies carried out are insufficient for an unambiguous conclusion about the possibility of the development of gas sensors based on acoustic devices with mycelium films as sensitive coatings.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is necessary to develop appropriate technologies for creation of the films based on mycelium of higher fungi and their deposition on the surface of piezoelectric plates. As is known, there are several approaches to the creation of the aforementioned films [ 16 , 17 ]. For example, it is possible to use a homogenizate or mycelium extract with various concentrations, to include a polymer in the resulting film, to use ethanol, water, or water/ethanol mixtures with different ratios as solvents, etc.…”

Section: Introductionmentioning

confidence: 99%

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Features of the Formation of Sensitive Films Based on Mycelium of Higher Fungi for Surface and Plate Acoustic Waves Gas Sensors

Smirnov

Анисимкин

Krasnopolskaya

et al. 2023

Sensors

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A comparative analysis of the responses of two types of acoustic waves (surface SAW and plate APW) with close frequencies and the same type of waves (SAW) with different frequencies toward various liquid vapors (water, acetone, ethanol) was carried out in this paper. Two types of films based on mycelium of higher fungus Ganoderma lucidum (Curtis) P. Karst (G. lucidum) prepared by various methods were used as sensitive coatings. These films were based on G. lucidum mycelium ethanolic (48% v/v) homogenizate (MEGl) and extract (EGl). A film deposition procedure compatible with acoustic devices technology was developed. Various piezoelectric substrates (YX-LiNbO3, 128 YX-LiNbO3) were used for appropriate acoustic delay lines production. It was found that additional SAW and APW attenuation associated with the appearance of mycelium films on the surface of the acoustic waveguide is two times greater for MEGL than for EGL films in the frequency range of 20–80 MHz The changes in acoustic wave amplitude and phase due to vapor absorption were measured and compared with each other, taking into account the differences in geometry of the samples. It was found that the phase response of the SAW delay lines with EGL films is three times higher than one with the presence of MEGL films for water and ethanol vapors. The films used are demonstrated good reproducibility and long-term stability for at least 2 months. Based on the results obtained, it was concluded that MEGl film is not appropriate for use in high frequency SAW delay lines as a sensitive coating. However, both types of the films (MEGl and EGl) could be used as sensitive coatings for low frequency SAW and APW sensors based on corresponding delay lines. Additionally, it was found that the films used are not sensitive to acetone vapor. As a result of the work carried out, a technique for creating sensitive films based on the mycelium of higher fungi compatible with the planar technology of acoustoelectronic delay lines was developed. The possibility of using such films for the development of gas SAW and APW sensors was shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%