Preparation and Electrochromic Properties of Nano Cellulose/Poly(3,4-ethylenedioxythiophene) Composite Films†

doi:10.7503/cjcu20160904

Abstract

Abstract:

Nano biomaterials based on renewable resources have been of growing interest due to the recent advances in the field of nano technological applications. Nano cellulose(NC) was extracted by swelling cotton pulp, following with the ultrasonic treatment. The composites of poly(3,4-ethylenedioxythiophene)(PEDOT) with NC inclusions at different loadings were prepared using in situ polymerization with ammonium peroxydisulfate(APS) as oxidant in nanocellulose aqueous suspension. NC and NC/PEDOT composites were characterized. The thin composite films were obtained by drop-coating the composites aqueous suspension to the surface of ITO conducting glass. The results showed that the original NC was rod-like, with average diameter of 20 nm and length range from 100 nm to 300 nm. The NC/PEDOT composites were core-shell structure with average diameter of about 30 nm and PEDOT was uniformly coated on the surface of NC. The electrochromic properties of NC/PEDOT composite films with different NC contents were studied by electrochemical test and spectrophotometery. The NC/PEDOT composite film containing 60% NC showed the highest contrast ratio of 24.4%, the shortest response time of 1 s, and the highest coloration efficiency of 51.8 cm²/C.

Key words: Nano cellulose, Poly(3,4-ethylenedioxythiophene), Chemical oxidation, Thin composite film, Electrochromic property

CLC Number:

TrendMD:

ZHANG Sihang, HE Yongfeng, FU Runfang, JIANG Jie, LI Qingbi, GU Yingchun, CHEN Sheng. Preparation and Electrochromic Properties of Nano Cellulose/Poly(3,4-ethylenedioxythiophene) Composite Films^†[J]. Chem. J. Chinese Universities, 2017, 38(6): 1090.

Figures/Tables 10

Scheme 1 Schematic illustration of the experiment process

Fig.1 UV-Vis transmittance spectra of NC suspension(a) and swelling cellulose suspension(b)Insets are the images of NC suspension(left) and swelling cellulose suspension(right).

Fig.2 SEM(A) and TEM(B) images of NCInsets are the higher magnification for clarity.

Fig.3 SEM images of PEDOT(A), NPE20(B), NPE40(C) and NPE60(D) Insets are the higher magnification for clarity.

Fig.4 TEM image of NPE60(A) and the magnified TEM image(B)

Fig.5 FTIR spectra of NC(a), PEDOT(b), NPE20(c), NPE40(d) and NPE60(e)

Fig.6 Cyclic voltammograms curves of PEDOT(a),NPE20(b), NPE40(c) and NPE60(d)

Fig.7 UV-Vis absorbance spectra of PEDOT(A), NPE20(B), NPE40(C) and NPE60(D)at different potentialsInsets: Photographic images of PEDOT(A), NPE20(B), NPE40(C), NPE60(D) films at colored state(-0.6 V) and bleached state(0.8 V).

Fig.8 Transmittance variation of PEDOT(a), NPE20(b), NPE40(c) and NPE60(d) for 1—2 switches(A) and 301—302 switches(B) between -0.6 V and 0.8 V

Table 1 Electrochromic parameters obtained at 530 nm for 1 and 300 switches

Sample	NC content(%)	τ_c/s		τ_b/s		T_c(%)		T_b(%)		ΔT(%)		Q/(mC·cm^-2)		CE/(cm²·C^-1)
Sample	NC content(%)	1	300	1	300	1	300	1	300	1	300	1	300	1	300
PEDOT	0	2.0	3.5	2.0	3.0	14.8	17.9	19.4	22.7	4.6	4.8	7.1	4.6	16.5	22.4
NPE20	20	1.5	2.0	1.5	2.5	10.8	12.8	23.4	25.1	12.6	12.3	9.4	5.8	35.7	50.4
NPE40	40	1.5	2.0	1.0	2.0	26.3	31.8	42.7	44.7	16.4	12.9	7.4	4.9	28.4	30.2
NPE60	60	1.0	2.0	1.0	1.5	21.8	29.4	46.2	48.1	24.4	18.7	6.3	4.0	51.8	53.5

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