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Development of multiple-droplet drop-casting method for the fabrication of coatings and thin solid films

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Abstract

Spray coating is a commercial and low-cost technique for the fabrication of large-area coatings and thin films, but it is a stochastic process that is hard to control, as far as the fabrication of thin coatings and solid films is concerned. On the other hand, drop-casting is a facile and more controllable coating technique than spray coating, but its application is limited to small-area thin solid films and coatings. The objective of this work is, therefore, to study the feasibility of impinging an array of droplets, rather than just one droplet, to fabricate polymeric and other solution-processed thin films with larger surface areas than those produced by conventional drop-casting. To this end, in this study, four droplets of poly(3,4-ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS) solution are released simultaneously and impinged on the four vertices of a square on a wettable solid surface to make a thin film. The effect of the substrate texture on the spreading and the film formation process is studied. As a novel idea, the substrate is excited by ultrasonic vibration to improve the droplet spreading and coalescence. It is shown that as time elapses, the impinged droplets successfully coalesce and make a thin film. Surface morphology and roughness of the resulting PEDOT:PSS thin solid films show that, except on the edges, the resulting thin solid films are uniform. This leads us to conclude that the application of equal-sized and equally-spaced multiple droplets released simultaneously and impinged on vibrating substrates could be considered as a new coating technique, which has some of the benefits of the spray coating, but it is much more controllable than spray coating.

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References

  1. Eslamian, M, “Inorganic and Organic Solution-Processed Thin Film Devices.” Nano Micro Lett., 9 3 (2017). doi:10.1007/s40820-016-0106-4

    Article  Google Scholar 

  2. Eslamian, M, “Spray-on Thin Film PV Solar Cells: Advances, Potentials and Challenges.” Coatings, 4 60–84 (2014)

    Article  Google Scholar 

  3. Eslamian, M, Zabihi, F, “Ultrasonic Substrate Vibration-Assisted Drop Casting (SVADC) for the Fabrication of Photovoltaic Solar Cell Arrays and Thin-Film Devices.” Nanoscale Res. Lett., 10 462 (2015)

    Article  Google Scholar 

  4. Soltani-Kordshuli, F, “Fabrication of Polymeric and Composite Thin Films by Spray Coating and Drop Casting for Organic Solar Cells.” Master’s Thesis, Shanghai Jiao Tong University, 2017

  5. Rein, M, “Phenomena of Liquid-Drop Impact on Solid and Liquid Surfaces.” Fluid Dyn. Res., 12 61–93 (1993)

    Article  Google Scholar 

  6. Josserand, C, Thoroddsen, ST, “Drop Impact on a Solid Surface.” Annu. Rev. Fluid Mech., 48 365–391 (2016)

    Article  Google Scholar 

  7. Yarin, A, “Drop Impact Dynamics: Splashing, Spreading, Receding, Bouncing….” Annu. Rev. Fluid Mech., 38 159–192 (2006)

    Article  Google Scholar 

  8. Mundo, CHR, Sommerfeld, M, Tropea, C, “Droplet-Wall Collisions: Experimental Studies of the Deformation and Breakup Process.” Int. J. Multiph. Flow, 21 151–173 (1995)

    Article  Google Scholar 

  9. Bertola, V, “Drop Impact on a Hot Surface: Effect of a Polymer Additive.” Exp. Fluids, 37 653–664 (2004)

    Article  Google Scholar 

  10. Bormashenko, E, Bormashenko, Y, Pogreb, R, Stanevsky, O, Whyman, G, “Droplet Behavior on Flat and Textured Surfaces: Co-Occurrence of Deegan Outward Flow with Marangoni Solute Instability.” J. Colloid Interface Sci., 306 128–132 (2007)

    Article  Google Scholar 

  11. Escure, C, Vardelle, M, Fauchais, P, “Experimental and Theoretical Study of the Impact of Alumina Droplets on Cold and Hot Substrates.” Plasma Chem. Plasma Process., 23 185–221 (2003)

    Article  Google Scholar 

  12. Gunjal, PR, Ranade, VV, Chaudhari, RV, “Dynamics of Drop Impact on Solid Surface: Experiments and VOF Simulations.” AIChE J., 51 59–78 (2005)

    Article  Google Scholar 

  13. Lee, MW, Kim, NY, Chandra, S, Yoon, SS, “Coalescence of Sessile Droplets of Varying Viscosities for Line Printing.” Int. J. Multiph. Flow, 56 138–148 (2013)

    Article  Google Scholar 

  14. Roisman, I, Prunet-Foch, B, Tropea, C, Vignes-Adler, M, “Multiple Drop Impact onto a Dry Solid Substrate.” J. Colloid Interface Sci., 256 396–410 (2002)

    Article  Google Scholar 

  15. Ristenpart, W, McCalla, P, Roy, R, Stone, H, “Coalescence of Spreading Droplets on a Wettable Substrate.” Phys. Rev. Lett., 97 064501 (2006)

    Article  Google Scholar 

  16. Barnes HA, Hardalupas Y, Taylor, AMKP, Wilkins JH, et al., “An Investigation of the Interaction between Two Adjacent Impinging Droplets.” In: Proceedings of the 15th International Conference on Liquid Atomisation and Spray Systems (ILASS) (Toulouse-France), pp. 1–7. ONERA, 1999

  17. Li, R, Ashgriz, N, Chandra, S, Andrews, JR, Drappel, S, “Coalescence of Two Droplets Impacting a Solid Surface.” Exp. Fluids, 48 1025–1035 (2010)

    Article  Google Scholar 

  18. Graham, PJ, Farhangi, MM, Dolatabadi, A, “Dynamics of Droplet Coalescence in Response to Increasing Hydrophobicity.” Phys. Fluids, 24 112105 (2012)

    Article  Google Scholar 

  19. Dalili, A, Chandra, S, Mostaghimi, J, Fan, HC, Simmer, JC, “Formation of Liquid Sheets by Deposition of Droplets on a Surface.” J. Colloid Interface Sci., 418 292–299 (2014)

    Article  Google Scholar 

  20. Yang, X, Chhasatia, VH, Sun, Y, “Oscillation and Recoil of Single and Consecutively Printed Droplets.” Langmuir, 29 2185–2192 (2013)

    Article  Google Scholar 

  21. Yang, X, Chhasatia, VH, Shah, J, Sun, Y, “Coalescence, Evaporation and Particle Deposition of Consecutively Printed Colloidal Drops.” Soft Matter, 8 9205–9213 (2012)

    Article  Google Scholar 

  22. Sarojini, KGK, Dhar, P, Varughese, S, Das, SK, “Coalescence Dynamics of PEDOT: PSS Droplets Impacting at Offset on Substrates for Inkjet Printing.” Langmuir, 32 5838–5851 (2016)

    Article  Google Scholar 

  23. Soltman, D, Subramanian, V, “Inkjet-Printed Line Morphologies and Temperature Control of the Coffee Ring Effect.” Langmuir, 24 2224–2231 (2008)

    Article  Google Scholar 

  24. Maki, KL, Kumar, S, “Fast Evaporation of Spreading Droplets of Colloidal Suspensions.” Langmuir, 27 11347–11363 (2011)

    Article  Google Scholar 

  25. Zabihi, F, Eslamian, M, “Characteristics of Thin Films Fabricated by Spray Coating on Rough and Permeable Paper Substrates.” J. Coat. Technol. Res., 12 489–503 (2015)

    Article  Google Scholar 

  26. Zabihi, F, Eslamian, M, “Substrate Vibration-Assisted Spray Coating (SVASC): Significant Improvement in Nano-Structure, Uniformity, and Conductivity of PEDOT: PSS Thin Films for Organic Solar Cells.” J. Coat. Technol. Res., 12 711–719 (2015)

    Article  Google Scholar 

  27. Zabihi, F, Eslamian, M, “Low-Cost Transparent Graphene Electrodes Made by Ultrasonic Substrate Vibration-Assisted Spray Coating (SVASC) for Thin Film Devices.” Graphene Technol. (2017). doi:10.1007/s41127-017-0003-8

    Google Scholar 

  28. Soltani-Kordshuli, F, Zabihi, F, Eslamian, M, “Graphene-Doped PEDOT:PSS Nanocomposite Thin Films Fabricated by Conventional and Substrate Vibration-Assisted Spray Coating (SVASC).” Eng. Sci. Technol. Int. J., 19 1216–1223 (2016)

    Article  Google Scholar 

  29. Chen, Q, Zabihi, F, Eslamian, M, “Improved Functionality of PEDOT: PSS Thin Films via Graphene Doping, Fabricated by Ultrasonic Substrate Vibration-Assisted Spray Coating.” Synth. Met., 222 309–317 (2016)

    Article  Google Scholar 

  30. Zabihi, F, Ahmadian-Yazdi, MR, Eslamian, M, “Fundamental Study on the Fabrication of Inverted Planar Perovskite Solar Cells Using Two-Step Sequential Substrate Vibration-Assisted Spray Coating (2S-SVASC).” Nanoscale Res. Lett., 11 71 (2016)

    Article  Google Scholar 

  31. Wang, Q, Eslamian, M, “Improving Uniformity and Nanostructure of Solution-Processed Thin Films Using Ultrasonic Substrate Vibration Post Treatment (SVPT).” Ultrasonics, 67 55–64 (2016)

    Article  Google Scholar 

  32. Xie, Y, Zabihi, F, Eslamian, M, “Fabrication of Highly Reproducible Polymer Solar Cells Using Ultrasonic Substrate Vibration Posttreatment.” J. Photonics Energy, 6 045502 (2016)

    Article  Google Scholar 

  33. Zabihi, F, Chen, Q, Xie, Y, Eslamian, M, “Fabrication of Efficient Graphene-Doped Polymer/Fullerene Bilayer Organic Solar Cells in Air Using Spin Coating Followed by Ultrasonic Vibration Post Treatment.” Superlattices Microstruct., 100 1177–1192 (2016)

    Article  Google Scholar 

  34. Habibi, M, Eslamian, M, Soltani-Kordshuli, F, Zabihi, F, “Controlled Wetting/Dewetting through Substrate Vibration-Assisted Spray Coating (SVASC).” J. Coat. Technol. Res., 13 211–225 (2016)

    Article  Google Scholar 

  35. Rahimzadeh, A, Eslamian, M, “Stability of Thin Liquid Films Subjected to Ultrasonic Vibration and Characteristics of the Resulting Thin Solid Films.” Chem. Eng. Sci., 158 587–598 (2017)

    Article  Google Scholar 

  36. Shklyaev, S, Khenner, M, Alabuzhev, AA, “Enhanced Stability of a Dewetting Thin Liquid Film in a Single-Frequency Vibration Field.” Phys. Rev. E, 77 036320 (2008)

    Article  Google Scholar 

  37. Shklyaev, S, Alabuzhev, AA, Khenner, M, “Influence of a Longitudinal and Tilted Vibration on Stability and Dewetting of a Liquid Film.” Phys. Rev. E, 79 051603 (2009)

    Article  Google Scholar 

  38. Benilov, ES, Chugunova, M, “Waves in Liquid Films on Vibrating Substrates.” Phys. Rev. E, 81 036302 (2010)

    Article  Google Scholar 

  39. Rahimzadeh, A, Eslamian, M, “On Evaporation of Thin Liquid Films Subjected to Ultrasonic Substrate Vibration.” Int. Commun. Heat Mass Transf., 83 15–22 (2017)

    Article  Google Scholar 

  40. Yasui, K, “Fundamentals of Acoustic Cavitation and Sonochemistry.” In: Pankaj, KY, Ashokkumar, M (eds.) Theoretical and Experimental Sonochemistry Involving Inorganic Systems. Springer, Berlin, 2011. doi:10.1007/978-90-481-3887-6_1

    Google Scholar 

  41. Suslick, KS, Price, GJ, “Applications of Ultrasound to Materials Chemistry.” Annu. Rev. Mater. Sci., 29 295–326 (1999)

    Article  Google Scholar 

  42. Yeo, LY, Friend, JR, “Surface Acoustic Wave Microfluidics.” Annu. Rev. Fluid Mech., 46 379–406 (2014)

    Article  Google Scholar 

  43. Du, XY, Swanwick, ME, Fu, YQ, Luo, JK, Flewitt, AJ, Lee, DS, Maeng, S, Milne, WI, “Surface Acoustic Wave Induced Streaming and Pumping in 128° Y-Cut LiNbO3 for Microfluidic Applications.” J. Micromech. Microeng., 19 035016 (2009)

    Article  Google Scholar 

  44. Nii, S, “Ultrasonic Atomization.” In: Ashokkumar, M (ed.) Handbook of Ultrasonics and Sonochemistry, pp. 239–257. Springer, Singapore, 2016. doi:10.1007/978-981-287-278-4_7

    Chapter  Google Scholar 

  45. Diemer, PJ, Lyle, CR, Mei, Y, Sutton, C, Payne, MM, Anthony, JE, Coropceanu, V, Brédas, JL, Jurchescu, OD, “Vibration-Assisted Crystallization Improves Organic/Dielectric Interface in Organic Thin-Film Transistors.” Adv. Mater., 25 6956–6962 (2013)

    Article  Google Scholar 

  46. Kim, BG, Kim, MS, Kim, J, “Ultrasonic-Assisted Nanodimensional Self Assembly of Poly-3-Hexylthiophene for Organic Photovoltaic Cells.” ACS Nano, 4 2160–2166 (2010)

    Article  Google Scholar 

  47. Chopra, KL, Randlett, MR, “Effect of Ultrasonic Vibrations of the Substrate on the Growth of Thin Metal Films.” Appl. Phys. Lett., 11 202–203 (1967)

    Article  Google Scholar 

  48. Mohanchandra, KP, Shanbhouge, HG, Uchi, J, “Effect of Substrate Vibration During Evaporation on the Optical Properties of Cadmium Chalcogenide Films.” J. Phys. D Appl. Phys., 25 853–856 (1992)

    Article  Google Scholar 

  49. Leger, L, Joanny, JF, “Liquid Spreading.” Rep. Prog. Phys., 55 (4) 431–486 (1992)

    Article  Google Scholar 

  50. de Gennes, PG, “Wetting: Statics and Dynamics.” Rev. Mod. Phys., 57 (3) 827–863 (1985)

    Article  Google Scholar 

  51. Kramer, RK, Boley, JW, Stone, HA, Weaver, JC, Wood, RJ, “Effect of Microtextured Surface Topography on the Wetting Behavior of Eutectic Gallium − Indium Alloys.” Langmuir, 30 533–539 (2014)

    Article  Google Scholar 

  52. Brunet, P, Eggers, J, Deegan, RD, “Motion of a Drop Driven by Substrate Vibrations.” Eur. Phys. J. Special Topics, 166 11–14 (2009)

    Article  Google Scholar 

  53. Thiele, U, Mertig, M, Pompe, W, “Dewetting of an Evaporating Thin Liquid Film: Heterogeneous Nucleation and Surface Instability.” Phys. Rev. Lett., 80 2869 (1998)

    Article  Google Scholar 

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Acknowledgments

Financial support from the Shanghai Municipal Education Commission via the Oriental Scholar fund and the funding from National Natural Science Foundation of China (NSFC) are acknowledged.

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  1. University of Michigan - Shanghai Jiao Tong University Joint Institute, Shanghai, 200240, China

    Morteza Eslamian & Firuze Soltani-Kordshuli

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  1. Morteza Eslamian
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Correspondence to Morteza Eslamian.

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Eslamian, M., Soltani-Kordshuli, F. Development of multiple-droplet drop-casting method for the fabrication of coatings and thin solid films. J Coat Technol Res 15, 271–280 (2018). https://doi.org/10.1007/s11998-017-9975-9

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