Preparation, characterization and applications of ultrathin cellulose acetate Langmuir–Blodgett films

Electrochemical Impedance Spectroscopy and its Applications

“…In such cases, an additional branch must be added in parallel (Fig. 12.2c) consisting of the resistance, R a , in series with the parallel connection of the pinhole resistance, R ph , and its capacitance, C ph [488,489]. The surface coverage of the pinholes is usually very small and does not influence very much the electrode capacitance.…”

Thin functionalized films on cylindrical microelectrodes for electrochemical determination of Hg(II)

“…We suspect that the absence of a stripping peak employing CFME modified with Kryptofix 22DD embedded in a relatively thick film of CA is also due to sluggish diffusion across the film. We have shown that multilayers of CA formed by the LB method show a sieving effect, which depends on their thickness [36]. Hence, it is very probable that our dipcoated films were too thick.…”

“…4B). Thin layers of cellulose acetate form a permeable, membrane-like structure [36] and therefore can easily be used for modification of electrodes without significantly affecting the diffusion of the analyte to the electrode surface. Moreover, Kryptofix 22DD is insoluble in water and therefore remains in the layer, namely, on the electrode surface.…”

Nanoparticle‐Imprinted Matrices as Sensing Layers for Size‐Selective Recognition of Silver Nanoparticles

“…However, the resulting NAIM materials tended to disintegrate into powder during etching, which was attributed to the rigid polymer structure, incomplete crosslinking, and incompatibility with the solvent . NPs have been embedded into thin films by diverse methods such as spin‐ and dip‐coating, layer‐by‐layer, vacuum deposition, and the Langmuir–Blodgett (LB) technique . The latter was successfully applied to establish our first NAIM concept by co‐dispersion of a positively charged polyaniline LB film and negatively charged citrate‐protected NPs, which were electrostatically assembled and incorporated into the film at the air–water interface .…”