Fabrication of Tandem PMMA Photonic Crystal Films by Flow-controled Deposition Method and Study of Their Optical Properties †

doi:10.7503/cjcu20190482

Abstract

Abstract:

Finely organized mono-layer polymethyl methacrylate(PMMA)photonic crystal films were assembled by a flow-controlled deposition method through adjusting the concentration of PMMA colloidal microspheres and the velocity of pump. An optimized assembling condition scope was obtained for the preparation of high qulity PMMA photonic crystals. It was found that the thickness of photonic crystal film increases with the increasing of the concentration of colloidal microspheres or decreasing of the velocity of pump. The optical property of PMMA photonic crystal films was investigated and it was found that the photonic band gap red-shifted/blue-shifted with the increasing/decreasing of the thickness of photonic crystal films. On the basis, tandem photonic crystal films were assembled by using PMMA microspheres with different sizes. The optical properties of tandem photonic crystal films show simple superposition of the elemental photonic crystal layers without any synergistic effect. These would pave the way for further exploring the UV-Vis-Infrared light harvesting rainbow tandem photonic crystal films and thereof the development of solar light driven photocatalysts.

Key words: Flow-controlled deposition method, Velocity of pump, Colloidal microsphere solution, Tandem photonic crystal film

CLC Number:

O644

TrendMD:

LI Jiefeng,ZHAO Jianhong,ZHAO Yongxiang. Fabrication of Tandem PMMA Photonic Crystal Films by Flow-controled Deposition Method and Study of Their Optical Properties ^†[J]. Chem. J. Chinese Universities, 2020, 41(2): 293.

Figures/Tables 7

Fig.1 Schematic of colloidal crystals arranged by vertical self-assembly Vc: the growth rate of the product; Vw: the withdrawal rate of the substrate plate.

Sample	V(H₂O)/mL	V(MMA)/mL	$m Initiator *$ /g	Temperature/℃	Size/nm	Standard deviation
PMMA-1	240	45	0.225	80	318	0.0084
PMMA-2	240	45	0.225	70	401	0.0073
PMMA-3	240	60	0.225	70	454	0.0104

Sample	V(H₂O)/mL	V(MMA)/mL	$m Initiator *$ /g	Temperature/℃	Size/nm	Standard deviation
PMMA-1	240	45	0.225	80	318	0.0084
PMMA-2	240	45	0.225	70	401	0.0073
PMMA-3	240	60	0.225	70	454	0.0104

Fig.2 SEM images showing top view, side view(inset)(A—E) and digital photographs(F, G) of PMMA photonic crystals assembled by PMMA microspheres with a diameter of 401 nm(PMMA-2) Concentration of PMMA colloidal suspension(wPMMA) and velocity of pump(Vp)/(mL·min-1): (A) 0.6%, 0.23; (B) 0.6%, 0.34; (C) 0.6%, 0.45; (D) 0.8%, 0.45; (E) 1.0%, 0.45. Digital photographs from left to right correspond to samples shown in (A)—(E): (F) vertically; (G) at 45° reflection angle under natural light.

Fig.3 SEM images showing top view, side view(insets, up) and digital photographs(insets, down) of PMMA-2 photonic crystal thin films, optimized wPMMA-Vp conditions for assembling stable high-quality PMMA photonic crystal thin films(C) and relationship between assembly conditions and PMMA photonic crystal thinkness(D) Assembly conditions: (A) Vp=0.23 mL/min, wPMMA=0.4%; (B) Vp=0.67 mL/min, wPMMA=1.2%.

Fig.4 SEM images of top view of PMMA-1(A) and PMMA-3(B) photonic crystal thin films wPMMA=0.6% and Vp=0.34 mL/min. Insets: digital photographs.

Fig.5 UV-Vis transmittance spectra of PMMA-2(A—C) and PMMA-1(a), PMMA-2(b) and PMMA-3(c)(D) photonic crystal in air showing photonic bandgaps along the [111] direction wPMMA(%) and Vp/(mL·min-1): (A) a. 0.6%, 0.23; b. 0.6%, 0.34; c. 0.6%, 0.45. (B) a. 0.6, 0.45; b. 0.8%, 0.45; c. 1.0%, 0.45. (C) a. 0.4%, 0.23; b. 0.6%, 0.34; c. 0.8%, 0.45; d. 1.2%, 0.67. (D) 0.6%, 0.34.

Fig.6 SEM images(A, B, D, E) and UV-Vis transmittance spectra(C, F) of tandem PMMA-2/1(A—C) and PMMA-2/3(D—F) photonic crystal films (A, D) Top view; (B, E) cross-sectional view. (C) a. +PMMA-2/1; b. -PMMA-2/1; (F) a. +PMMA-2/3; b. -PMMA-2/3.

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