In situ Electrochemical Impedance Spectroscopy of Electrostatically Driven Selective Gold Nanoparticle Adsorption on Block Copolymer Lamellae

Abstract

Electrostatic attraction between charged nanoparticles and oppositely charged nanopatterned polymeric films enables tailored structuring of functional nanoscopic surfaces. The bottom-up fabrication of organic/inorganic composites for example bears promising potential toward cheap fabrication of catalysts, optical sensors, and the manufacture of miniaturized electric circuitry. However, only little is known about the time-dependent adsorption behavior and the electronic or ionic charge transfer in the film bulk and at interfaces during nanoparticle assembly via electrostatic interactions. In situ electrochemical impedance spectroscopy (EIS) in combination with a microfluidic system for fast and reproducible liquid delivery was thus applied to monitor the selective deposition of negatively charged gold nanoparticles on top of positively charged poly(2-vinylpyridinium) (qP2VP) domains of phase separated lamellar poly(styrene)-block-poly(2-vinylpyridinium) (PS-b-qP2VP) diblock copolymer thin films

Multiple Functional Biomass‐Derived Activated Carbon Materials for Aqueous Supercapacitors, Lithium‐Ion Capacitors and Lithium‐Sulfur Batteries

“…The Bode curve also exhibits the small response time of 0.1 ms and phase angle of approaching 90, which further confirm the good rate performance and conductivity of activated carbon. [27][28][29] Cycling stability text shows after 5000 cycles the specific capacitance can still keep 99% (Figure 2f).…”

Single Interdigital Transducer Approach for Gravimetrical SAW Sensor Applications in Liquid Environments

“…The adsorption of nanoparticles on surfaces follows first-order kinetics as the adsorption depends only on the AuNP concentration. Thus, a first-order exponential function (Equation (4)) is suitable [ 44 , 45 , 46 ] to describe the adsorption process quantitatively. …”

Electrochemical Applications of Microphase‐Separated Block Copolymer Thin Films

“…[104] These authors prepared a thin PS-b-PFS film comprising cylindrical PFS microdomains (20 nm in diameter) on a conductive substrate, and investigated the adsorption of ferritin onto the film using electrochemical quartz crystal microbalance (E-QCM) and AFM. [105] A thin PS-b-P2VP film (50 nm thick) was prepared via spin-coating on gold, followed by exposure to toluene vapor for obtaining lamellar P2VP microdomains oriented perpendicularly to the underlying substrate. AFM images showed selective deposition of ferritin onto the PFS microdomains based on electrostatic attraction with the cationic ferrocenium moieties.…”

“…Subsequently, Wagner et al demonstrated in-situ measurements of the adsorption of negatively-charged AuNPs onto positively-charged microdomains using EIS. [105] A thin PS-b-P2VP film (50 nm thick) was prepared via spin-coating on gold, followed by exposure to toluene vapor for obtaining lamellar P2VP microdomains oriented perpendicularly to the underlying substrate. The P2VP moieties were reacted with alkyl diiodide to gain crosslinked 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 microdomains (40 nm wide) comprising quaternized P2VP moieties.…”