Effect of Hydrophobic Modification on the Durability and Environmental Properties of Porous MgF2 Antireflective Films

doi:10.1007/s40195-014-0087-6

Abstract

Abstract:

Conventional porous MgF₂ antireflective films show poor environmental durability due to its hydrophilic nature. To improve the film environmental durability, hydrophobic porous MgF₂ antireflective films are prepared by a methyl silicone-modified MgF₂ sol. Effects of the methyl silicone proportions on the film properties are examined in order to control the wettability, peak transmittance, and environmental durability of the films. The modification of methyl silicone can increase the film hydrophobicity, thus decreases the adsorption of water, and improves the environmental durability. However, large amounts of methyl silicone could increase the film refractive index, resulting in the decrease in peak transmittance for films on BK7 glass. Films with 40% silicone show water contact angle of 110°, peak transmittance of 98.7%, and good environmental durability. The results of accelerated test show that the environmental durability of the porous MgF₂ films modified with 40% methyl silicone is six times higher than that of the conventional films.

Key words: Porous MgF₂, Antireflective film, Environmental durability, Hydrophobicity

Lianghong Yan, Nan Liu, Songnan Zhao, Hongwei Yan, Haibing Lü, Xiaodong Yuan. Effect of Hydrophobic Modification on the Durability and Environmental Properties of Porous MgF₂ Antireflective Films[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 649-655.

Figures/Tables 10

Fig. 1 Experimental procedure for preparation of the hydrophobic MgF2 film

Fig. 2 The profiles of a water droplet (0.6 μL) on the films: a water on the unmodified MgF2 film with CA of 37°; b water on the methyl silicone-modified MgF2 film with CA of 113°

Fig. 3 Water contact angles of the films as a function of methyl silicone proportions

Fig. 4 Infrared spectra for the unmodified MgF2 film and 40% methyl silicone/MgF2 film

Fig. 5 Atomic force microscopy images of MgF2 films: a unmodified MgF2 film, b methyl silicone-modified MgF2 film

Fig. 6 Transmittance spectra for the films as a function of methyl silicone proportion

Table 1 Effect of methyl silicone proportion on the film refractive index and peak transmittance

Weight proportion of silicone to MgF₂ (%)	Measured peak transmittance (%)	Refractive index	Porosity (%)	Calculated peak transmittance (%)
0	99.94	1.18	55.25	99.95
10	99.66	1.19	52.55	99.79
20	99.23	1.24	38.69	99.31
40	98.9	1.29	24.26	98.91
60	97.28	1.34	9.27	97.33
80	95.42	1.39	0	95.64

Fig. 7 Schematic representation of formation mechanism of hydrophobic film: a formation of MgF2 nanoparticle sol, b formation of the methyl silicone, c modification of MgF2 particle with methyl silicone and formation of hydrophobic film

Fig. 8 Degradation of transmittance for the films with different methyl silicone proportions as a function of the time in the climate chamber

Fig. 9 Etch pits formed on the surface of MgF2 films without methyl silicone

References 33

[1]	P.A. Sermon, R. Badheka, J. Sol–Gel. Sci. Technol. 32(149), 149(2004)10.1007/s10971-004-5780-x
[2]	H. Krüger, A. Hertwig, U. Beck, E. Kemnitz, Thin Solid Films 518, 6080(2010)10.1016/j.tsf.2010.06.025
[3]	A.A. Rywak, J.M. Burlitch, Chem. Mater. 8, 60(1996)10.1021/cm950109j
[4]	J.K. Murthy, U. Groß, S. Rüdiger, E. Kemnitz, J.M. Winfield, J. Solid State Chem. 179, 739(2006)10.1016/j.jssc.2005.11.033
[5]	H. Krüger, E. Kemnitz, A. Hertwig, U. Beck, Thin Solid Films 516, 4175(2008)10.1016/j.tsf.2007.10.126
[6]	T. Wiktorczyk, M. Oleś, Opt. Mater. 29, 1768(2007)10.1016/j.optmat.2006.09.018
[7]	F. Perales, J.M. Herrero, D. Jaque, C. De las Heras, Opt. Mater. 29, 783(2007)10.1016/j.optmat.2006.01.001
[8]	H.Y. Sun, T.Q. Jia, C.B. Li, X.X. Li, S.Z. Xu, D.H. Feng, X.F. Wang, X.C. Ge, Z.Z. Xu, Solid State Commun. 141, 127(2007)10.1016/j.ssc.2006.10.012
[9]	J.I. Larruquert, R.A.M. Keski-Kuha, Opt. Commun. 215, 93(2003)10.1016/S0030-4018(02)02229-0
[10]	D.G. Chen, Sol. Energy Mater. Sol. Cells 68, 313(2001)10.1016/S0927-0248(00)00365-2
[11]	I.M. Thomas, Appl. Opt. 25(9), 1481(1986)10.1364/AO.25.001481
[12]	I.M. Thomas, Appl. Opt. 27(16), 3356(1988)10.1364/AO.27.003356
[13]	S. Fujihara, M. Tada, T. Kimura, Thin Solid Films 304, 252(1997)10.1016/S0040-6090(97)00156-9
[14]	P.H. Joosten, P. Heller, H.J.P. Nabben, H.A.M. van Hal, T.J.A. Popma, J. Haisma, Appl. Opt. 24, 2674(1985)10.1364/AO.24.002674
[15]	S. Fujihara, M. Tada, T. Kimura, J. Sol-Gel. Sci. Technol. 19, 311(2000)10.1023/A%3A1008729531254
[16]	T. Murata, H. Ishizawa, I. Motoyama, A. Tanaka, J. Sol-Gel. Sci. Technol. 32, 161(2004)10.1007/s10971-004-5782-8
[17]	T. Murata, H. Ishizawa, A. Tanaka, Appl. Opt. 47(13), C246(2008)10.1364/AO.47.00C246
[18]	T. Murata, H. Ishizawa, A. Tanaka, Appl. Opt. 50(9), C403(2011)10.1364/AO.50.00C403
[19]	H. Ishizawa, S. Niisaka, T. Murata, A. Tanaka, Appl. Opt. 47(13), C200(2008)10.1364/AO.47.00C200
[20]	D. Grosso, C. Boissière, C. Sanchez, Nat. Mater. 6, 572(2007)10.1038/nmat1950
[21]	J.D. Bass, C. Boissiere, L. Nicole, D. Grosso, C. Sanchez, Chem. Mater. 20(17), 5550(2008)10.1021/cm8010106
[22]	P.P. Fedorov, A.A. Luginina, S.V. Kuznetsov, V.V. Osiko, J. Fluorine Chem. 132, 1012(2011)10.1016/j.jfluchem.2011.06.025
[23]	P.B. Barraclough, P.G. Hall, J. Chem. Soc., Faraday Trans. 72, 610(1976)10.1039/f19767200610
[24]	H.K. Pulker, E. Jung, Thin Solid Films 9(1), 57(1972)10.1016/0040-6090(72)90330-6
[25]	T.M. Christmas, D. Richmond, Opt. Laser Technol. 9(3), 109(1977)10.1016/0030-3992(77)90080-9
[26]	P.V. Ashrit, S. Badilescu, F.E. Girouard, V. Truong, Appl. Opt. 28, 420(1989)10.1364/AO.28.000420
[27]	T. Monde, N. Nakayama, K. Yano, T. Yoko, T. Konakahara, J. Colloid Interface Sci. 185, 111(1997)10.1006/jcis.1996.4546
[28]	K.B. Gurevich, T.M. Roshchina, N.K. Shoniya, L.M. Kustov, A.V. Ivanov, J. Colloid Interface Sci. 254, 39(2002)10.1006/jcis.2002.8553
[29]	Y.I. Tarasevich, V.E. Polyakov, A.A. Serdan, G.V. Lisichkin, Colloid J. 67, 638(2005)10.1007/s10595-005-0143-z
[30]	Y.K. Lai, X.F. Gao, H.F. Zhuang, J.Y. Huang, C.J. Lin, L. Jiang, Adv. Mater. 21, 3799(2009)10.1002/adma.200900686
[31]	S. Wuttke, A. Vimont, J.C. Lavalley, M. Daturi, E. Kemnitz, J. Phys. Chem. C 114, 5113(2010)10.1021/jp911584h
[32]	G.M. Wu, J. Wang, J. Shen, T.H. Yang, Q.Y. Zhang, B. Zhou, Z.S. Deng, B. Fan, D.P. Zhou, F.S. Zhang, Mater. Sci. Eng. B78, 135(2000)10.1016/S0921-5107(00)00529-8
[33]	X.X. Zhang, H.P. Ye, B. Xiao, L.H. Yan, H.B. Lv, B. Jiang, J. Phys. Chem. C 114, 19979(2010)10.1021/jp106192z

Effect of Hydrophobic Modification on the Durability and Environmental Properties of Porous MgF₂ Antireflective Films

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