Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers

Schrader I, Wittig L, Richter K, Vieker H, Beyer A, Gölzhäuser A, Hartwig A, Swiderek P (2014)
Langmuir 30(40): 11945-11954.

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Copper(II) oxalate was grown on carboxy-terminated self-assembled monolayers using a step-by-step approach by dipping the surfaces alternately in ethanolic solutions of copper(II) acetate and oxalic acid with intermediate thorough rinsing steps. The deposition was monitored by reflection absorption infrared spectroscopy (RAIRS), a quartz microbalance with dissipation measurement (QCM-D), scanning electron microscopy (SEM), and helium ion microscopy (HIM). Amounts of material corresponding to a coverage of 75% of a monolayer are deposited in each dipping step in copper(II) acetate solution while deposition of oxalic acid produces a viscoelastic layer that is partially removed by rinsing. This points toward initial aggregation but acid not bound to Cu2+ ions as oxalate ions is removed by the rinsing steps. RAIRS further indicates that the material grows as copper(II) oxalate ribbons similar to the crystal structure but with ribbons oriented roughly parallel to the surface. SEM and HIM give evidence of the formation of needle-shaped structures which are a possible explanation for the viscoelastic behavior of the layer.
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Schrader I, Wittig L, Richter K, et al. Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers. Langmuir. 2014;30(40):11945-11954.
Schrader, I., Wittig, L., Richter, K., Vieker, H., Beyer, A., Gölzhäuser, A., Hartwig, A., et al. (2014). Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers. Langmuir, 30(40), 11945-11954.
Schrader, I., Wittig, L., Richter, K., Vieker, H., Beyer, A., Gölzhäuser, A., Hartwig, A., and Swiderek, P. (2014). Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers. Langmuir 30, 11945-11954.
Schrader, I., et al., 2014. Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers. Langmuir, 30(40), p 11945-11954.
I. Schrader, et al., “Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers”, Langmuir, vol. 30, 2014, pp. 11945-11954.
Schrader, I., Wittig, L., Richter, K., Vieker, H., Beyer, A., Gölzhäuser, A., Hartwig, A., Swiderek, P.: Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers. Langmuir. 30, 11945-11954 (2014).
Schrader, I., Wittig, L., Richter, K., Vieker, Henning, Beyer, André, Gölzhäuser, Armin, Hartwig, A., and Swiderek, P. “Formation and Structure of Copper(II) Oxalate Layers on Carboxy-Terminated Self-Assembled Monolayers”. Langmuir 30.40 (2014): 11945-11954.
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