Carbon-paste nanocomposites as unconventional gate electrodes for electrolyte-gated organic field-effect transistors: electrical modulation and bio-sensing

Abstract

Nanocomposite carbon-paste electrodes (NC-CPEs) have been investigated for the first time in electrolyte-gated organic field-effect transistors (EGOFETs) as a replacement of conventional metal gate electrodes for bio-sensing applications.

Interplay between Electrolyte-Gated Organic Field-Effect Transistors and Surfactants: A Surface Aggregation Tool and Protecting Semiconducting Layer

“…Carbon paste electrode was fabricated according to a previously reported protocol. 33 , 34 The scan rate of transfer characteristics was set to ∼70 mV·s –1 unless otherwise specified.…”

Cyclodextrin-based superparamagnetic host vesicles as ultrasensitive nanobiocarriers for electrosensing

“…High specific surface area electrodes made from carbon nanomaterials are desirable from an electrochemical point of view. 28,29 In particular, the dispersion of different carbon allotropes through an insulating polymeric matrix for the development of nanocomposite carbon paste electrodes (NC-CPEs) has played a leading role in electroanalysis. 30 NC-CPEs benefit from several intrinsic features, such as robustness, renewable surface by a simple polishing step, small background currents and tuned bio-functionality.…”

Electronic Performance of Polymer Carbon‐Paste Nanoallotropes from 0D to 3D as Novel Gate Electrodes in Water‐Gated Organic Field‐Effect Transistors

“…In concordance with the morphological characterization, similar A values were achieved by simply optimizing the electrically conductive networks via tuning the filler/polymer composition ratio, making possible to avoid its influence on the device performance (see Table 1) since this value is known to be directly related to the current (I p ) through Equation ( 1). [29] However, it is important to note the larger capacitive behavior of the 2D-NC-CPgEs, resulting in a significant ΔE increase.…”

“…In fact, the trend of the V TH shift follows the carbon material dimensionality accordingly to: CNHs (0D) > CNTs (1D) > rGO (2D) > G (3D). Further, is it important to note that since the gate surface electroactive area A is similar in all cases, the modulation of the V TH should indeed be caused by topological differences of the carbon materials [29] combined with the !"!#$%&'! shift, although the latter effect is less prevailing.…”

“…Only very recently, our research group reported the use of a NC-CPE made by dispersing carbon nanotubes (CNTs) within an insulating epoxy resin, offering an appealing alternative to be used as carbon-based gates in WGOFETs, permitting to modulate the device response depending on the carbon loading and allowing an easy and reproducible bio-functionalization for sensing applications. [29] The research herein is devoted to electrically explore the WGOFET capability using nanocomposite carbon-paste gate electrodes (NC-CPgEs) employing four different carbon fillers with dimensionality ranging from 0D to 3D, such as 0D carbon nanohorns (CNHs), 1D CNTs, 2D reduced graphene oxide (rGO) and 3D graphite (G). These materials have been used as conducting fillers and dispersed throughout an inert polymeric matrix in an optimum filler/polymer composition ratio for NC-CPgE engineering.…”