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. 2023 Feb 27;24(5):4638.
doi: 10.3390/ijms24054638.

Characteristics of a Rollable Dielectric Barrier Discharge Plasma and Its Effects on Spinach-Seed Germination

Jun Sup Lim  1 , Daeun Kim  2 , Sehoon Ki  3 , Sohail Mumtaz  1 , Abdul Munnaf Shaik  2 , Ihn Han  1 , Young June Hong  1 , Gyungsoon Park  2 , Eun Ha Choi  1   2
Affiliations

Characteristics of a Rollable Dielectric Barrier Discharge Plasma and Its Effects on Spinach-Seed Germination

Jun Sup Lim et al. Int J Mol Sci. .

Abstract

We investigated the characteristics of a rollable dielectric barrier discharge (RDBD) and evaluate its effects on seed germination rate and water uptake. The RDBD source was composed of a polyimide substrate and copper electrode, and it was mounted in a rolled-up structure for omnidirectional and uniform treatment of seeds with flowing synthetic air gas. The rotational and vibrational temperatures were measured to be 342 K and 2860 K, respectively, using optical emission spectroscopy. The chemical species analysis via Fourier-transform infrared spectroscopy and 0D chemical simulation showed that O3 production was dominant and NOx production was restrained at the given temperatures. The water uptake and germination rate of spinach seeds by 5 min treatment of RDBD was increased by 10% and 15%, respectively, and the standard error of germination was reduced by 4% in comparison with the controls. RDBD enables an important step forward in non-thermal atmospheric-pressure plasma agriculture for omnidirectional seed treatment.

Keywords: non-thermal atmospheric pressure plasma (NAP); omnidirectional and uniform treatment; plasma seed treatment; rollable dielectric barrier discharge (RDBD).

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Duty ratio of applied voltage, (b) voltage (black line) and discharge current (blue line) versus time.
Figure 2
Figure 2
Optical emission spectrum of plasma on the RDBD surface.
Figure 3
Figure 3
(a) Experimental and simulated results of O3, NO, and N2O versus time and (b) chemical species in 0D chemical simulation.
Figure 4
Figure 4
(a) EDS image of untreated spinach seed, (b) EDS image of spinach seed treated for 5 min, and (c) water uptake with RDBD treatment condition. The experiment was repeated three times with 150 seeds. (** denotes p < 0.01).
Figure 5
Figure 5
Spinach seed germination rate for each treatment day and treatment time. The experiment was repeated three times with 150 seeds. (* denotes p < 0.05 and ** denotes p < 0.01).
Figure 6
Figure 6
(a) Schematic of RDBD panel, (b) mount for RDBD, and (c) discharge in RDBD device.
See this image and copyright information in PMC

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