Thin Polyelectrolyte Multilayers Made by Inkjet Printing and Their Characterization by Nanomechanical Cantilever Sensors

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• 作者：Masaya Toda ; Yun Chen ; Sebastian K. Nett ; Akiko N. Itakura ; Jochen Gutmann ; R眉diger Berger
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 17, 2014
• 年：2014
• 卷：118
• 期：15
• 页码：8071-8078
• 全文大小：365K
• 年卷期：v.118,no.15(April 17, 2014)
• ISSN：1932-7455

文摘

Measurements with nanomechanical cantilever (NMC) sensors often reveal only qualitative results. Here we overcome this issue by inkjet printing well-defined polyelectrolyte multilayers (PEMs). We present a method that allows fabricating a 40 bilayer (BL) thick and 5 mm long line made of poly(allylamine hydrochloride) (PAH) and polystyrene sulfonate (PSS). NMC sensors were used to quantify the uptake of water in thin PEMs. We measured and analyzed the mass loading and the swelling response of the PEMs upon exposure to relative humidity between 5% and 80%. For a film made of 5 BLs we determined a Young鈥檚 module of 390 MPa for low humidity (<5%). Thicker PEM films made by 10 BLs exhibited a higher Young鈥檚 module of 560 MPa. The Young鈥檚 module decreased in both cases to 2鈥? MPa at 80% relative humidity. Furthermore, the NMC measurements of mass and swelling upon exposure to humidity indicated a thickness-dependent swelling of the PEMs.