Electrical and Optical Properties of Poly(vinyl chloride)/ZnS Nanocomposites Exposed to Gamma Radiation

Guimarães, Nara E.; Ximenes, Érika R. B.; Silva, Lindomar Avelino da; Santos, Renata Francisca da Silva; Araújo, Elmo Silvano; Aquino, Kátia Aparecida da Silva

doi:10.1590/1980-5373-MR-2022-0308

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Article • Mat. Res. 26 • 2023 • https://doi.org/10.1590/1980-5373-MR-2022-0308 copy

Electrical and Optical Properties of Poly(vinyl chloride)/ZnS Nanocomposites Exposed to Gamma Radiation

Authorship SCIMAGO INSTITUTIONS RANKINGS

Poly(vinyl chloride) (PVC) is considered one of the most versatile polymers due to its interaction with different additives. On the other hand, binary sulfides have wide applications as zinc sulfide (ZnS), one of the first discovered semiconductors. This study aims to synthesize a nanocomposite material containing nano ZnS in the PVC matrix with a surfactant as a compatibilizer agent to evaluate its optical and electrical properties when exposed to gamma radiation. Our results showed that adding ZnS at 0.5 wt% concentration in the PVC matrix promoted the system from insulating to the semiconductor material. Therefore, gamma radiation has played an important role in nanocomposites' optical and electrical properties with changes in electrical and electrical conductivity, constant dielectric parts, refraction index, optical band gap, and Urbach energy. Thus, our study points to the development of nanocomposite material, semiconductors, and features useful for applications in flexible electronics or optical-electronic devices.

Keywords:
Optical-electronic devices; gamma radiation; gap band

Zn Concentration	Thickness	Electrical conductivity (S/m)
(wt%)	(mm)	0	25	50	75
		(kGy)	(kGy)	(kGy)	(kGy)
0	0,127	2.9 x 10^-9	1.1 x 10^-9	1.3 x 10^-9	8.8 x 10^-9
0	±0,034	±1.2x10^-9	±2.0x10^-10	±3.0x10^-10	±3.0x10^-10
0.1	0,127	7.7 x 10^-7	1.3 x 10^-5	1.9 x 10^-9	7.5 x 10^-9
0.1	±0,016	±9.2x10^-8	±5.0x10^-6	±1.4x10^-10	±4.0x10^-10
0.3	0,128	1.1 x 10^-6	6.6 x 10^-5	2.5 x 10^-5	3.8 x 10^-9
0.3	±0,004	±6.3x10^-7	±4.0x10^-6	±2.4x10^-6	±1.2x10^-10
0.5	0,125	1.6 x 10^-5	3.7 x 10^-5	2.3 x 10^-5	1.0 x 10^-9
0.5	±0,024	±4.5x10^-6	±1.3x10^-6	±3.3x10^-6	±3.1x10^-10
0.7	0,131	1.1 x 10^-8	4.0 x 10^-5	1.5 x 10^-5	1.7 x 10^-8
0.7	±0,006	±3.6x10^-9	±3.5x10^-6	±2.3x10^-6	±2.0x10^-9
1	0,131	8.8 x 10^-7	3.3 x 10^-5	1.1 x 10^-5	1.1 x 10^-8
1	±0,034	±1.2x10^-8	±2.1x10^-6	±4.1x10^-6	±1.5x10^-9

Dose	0.0 wt%		0.1 wt%		0.3 wt%		0.5 wt%		0.7 wt%		1.0 wt%
Dose	n	K x 10^-5	n	K x 10^-5	n	K x 10^-5	n	K x 10^-5	n	K x 10^-5	n	K x 10^-5
0	1.46	1.6	1.48	1.9	1.53	2.7	1.55	2.9	1.62	4.1	1.71	6.0
25	1.40	0.8	1.42	1.0	1.49	2,1	1.64	4.5	1.67	4.9	1.71	6.0
50	1.41	0.9	1.43	1.2	1.47	1.8	1.54	2.7	1.65	4.6	1.70	5.8
75	1.41	0.9	1.43	1.2	1.46	1.6	1.51	2.4	1.61	3.9	1.67	5.0

ZnS (wt%)	E_g (eV)
	0 kGy			25 kGy			50 kGy			75 kGy
	2	1/2	$ε i$	2	1/2	$ε i$	2	1/2	$ε i$	2	1/2	$ε i$
0.0	4.67	3.62	4.22	4.63	3.51	4.20	4.65	3.53	4.12	4.79	3.70	4.08
0.1	4.59	3.56	4.17	4.55	3.44	4.13	4.62	3.52	4.01	4.72	3.65	4.04
0.3	4.51	3.37	4.05	4.49	3.31	3.92	4.43	3.29	3.93	4.68	3.61	3.97
0.5	4.46	3.27	4.03	4.48	3.29	3.81	4.42	3.19	3.82	4.62	3.57	3.79
0.7	4.62	3.72	4.05	4.42	3.14	3.61	4,38	3.06	3.72	4.46	3.45	3.52
1.0	4,51	3.53	4.04	4,41	2.99	3.57	4,31	2.88	3.57	4.42	3,42	3.31

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