Synthesis of Metallic Gold Colored α-Al2O3 Nanoplate-TiO2 Core-Shell Pigments with Robust and Photo-Stable Smooth TiO2 Shell

Su Jin Lee; Myoung Sang You; Jin Kyoung Park; Bum Jun Park; Sang Hyuk Im

Applied Chemistry for Engineering, Vol.31, No.4, 390-397, August, 2020

DOI10.14478/ace.2020.1041 Export Citation

Synthesis of Metallic Gold Colored α-Al2O3 Nanoplate-TiO2 Core-Shell Pigments with Robust and Photo-Stable Smooth TiO2 Shell

Su Jin Lee, Myoung Sang You, Jin Kyoung Park¹, Bum Jun Park^†, and Sang Hyuk Im^{1, †}

Functional Crystallization Center (ERC), Department of Chemical Engineering, Kyung Hee University, Yongin 17104, Republic of Korea
¹Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea

E-mail:,

To synthesize non-corrosive metallic gold colored α-Al2O3 nanoplate-TiO2 core-shell pigments with controlled roughness, we systematically checked the morphological variation of the TiO2 shell with the mole ratio of TiCl4 and NaOH from 1 : 1 to 1 : 1.5, 1 : 2, 1 : 2.5, 1 : 3, 1 : 3.5, and 1 : 4. The more increased mole ratio of TiCl4 and NaOH resulted in the smoother TiO2 shell due to the promoted formation of anatase TiO2 than that of the rutile one. By the heat-treatment of pigments at 500 ℃, we could improve the adhesiveness between TiO2 shell and α-Al2O3 nanoplates without changing their topology and roughness. In addition, the α-Al2O3 nanoplate with the robust TiO2 by heat-treatment exhibited comparable photo-stability against photo-catalytic degradation by UV exposure compared with the commercially available α-Al2O3/TiO2 lustering pigment.

Keywords:α-Al2O3 nanoplates;TiO2 shell;Roughness control;Adhesiveness;Pigment

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[1] Kaempgen M, Duesberg GS, Roth S, Appl. Surf. Sci., 252(2), 425 (2005)

[2] Lee JY, Connor ST, Cui Y, Peumans P, Nano Lett., 8, 689 (2008)

[3] Kumar A, Zhou C, ACS Nano., 4, 11 (2010)

[4] Hecht DS, Hu LB, Irvin G, Adv. Mater., 23(13), 1482 (2011)

[5] Rathmell AR, Bergin SM, Hua YL, Li ZY, Wiley BJ, Adv. Mater., 22(32), 3558 (2010)

[6] Ajayan PM, Schadler LS, Giannaris C, Rubio A, Adv. Mater., 12(10), 750 (2000)

[7] Ye H, Lam H, Titchenal N, Gogotsi Y, Ko F, Appl. Phys. Lett., 85, 1775 (2004)

[8] Franklin AD, Luisier M, Han SJ, Tulevski G, Breslin CM, Gignac L, Lundstrom MS, Haensch W, Nano Lett., 12, 758 (2012)

[9] Boukai AI, Bunimovich Y, JTK, Yu JK, Goddard WA, Heath JR, Nature, 451, 168 (2008)

[10] Biercuk MJ, Llaguno MC, Radosavljevic M, Hyun JK, Johnson AT, Appl. Phys. Lett., 80, 2767 (2002)

[11] Kim KS, Zhao Y, Jang H, Lee SY, Kim JM, Kim KS, Ahn JH, Kim P, Choi JY, Hong BH, Nature, 457, 706 (2009)

[12] Bae S, Kim H, Lee Y, Xu XF, Park JS, Zheng Y, Balakrishnan J, Lei T, Kim HR, Song YI, Kim YJ, Kim KS, Ozyilmaz B, Ahn JH, Hong BH, Iijima S, Nat. Nanotechnol., 5(8), 574 (2010)

[13] Wu J, Becerril HA, Bao Z, Liu Z, Chen Y, Peumans P, Appl. Phys. Lett., 92, 263302 (2008)

[14] Moon GD, Lim GH, Song JH, Shin M, Yu T, Lim B, Jeong U, Adv. Mater., 25(19), 2707 (2013)

[15] Seol YG, Trung TQ, Yoon OJ, Sohn IY, Lee NE, J. Mater. Chem., 22, 23759 (2012)

[16] Kim H, Miura Y, Macosko CW, Chem. Mater., 22, 3441 (2010)

[17] Su Y, Kravets VG, Wong SL, Waters J, Geim AK, Nair RR, Nat. Commun., 5, 4843 (2014)

[18] Debeljak M, Hladnik A, Cerne L, Gregor-Svetec D, Color Res. Appl., 38, 168 (2012)

[19] Pfaff G, Inorg. Mater., 39, 123 (2003)

[20] Stengl V, Subrt J, Bakardjieva S, Kalendova A, Kalenda P, Dyes Pigment., 58, 239 (2003)

[21] Teaney S, Pfaff G, Nitta K, Eur. Coat. J., 4, 90 (1999)

[22] Sharrock S, Schuel N, Eur. Coat. J., 1/2, 20 (2000)

[23] Suh MW, Lee SJ, You MS, Park SB, Im SH, RSC Adv., 5, 56954 (2015)

[24] Hecht E, Optics, 4th ed., Pearson Education Inc., Addison Wesley (2001).

[25] Song HK, Park BK, Lee JM, J. Korean Ceram. Soc., 42, 384 (2005)

[26] Cheng H, Ma J, Zhao Z, Qi L, Chem. Mater., 7, 663 (1995)