Surface Chemistry Determined Electrochemical Sensing Performance of Red Phosphorus and Single Walled Carbon Nanotube Composites

Abstract

Red phosphorus (RP) is a promising electrochemical sensing material owing to its abundant surface groups and reactive sites. In this study, a sodium dodecyl sulfate-assisted phosphorus-amine approach is employed to tune surface chemistry of RP nanoparticles. During the transition of the polyphosphorusamine anion to RP, the cleavage of POP bond and the formation of POC bond are monitored by in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy. The formed POC bonds that are originated from the PO reactive sites are theoretically revealed with the density functional theory calculations, charge density difference, and X-ray photoelectron spectroscopy. The energies of optimized aromatic and aliphatic POC bonds are −2.51 and −2.65 eV, respectively. To explore electrochemical sensing applications, RP nanoparticles are in situ grown on single-walled carbon nanotube (SWCNT). Such a stable RP/SWCNT suspension is applied to fabricate the RP/SWCNT integrated arrays via a template-filtration method. Such an array is efficient for sensitive and selective monitoring of p-phenylenediamine on hair dyes. This study provides insights into surface chemistry of RP, its roles in electrochemical sensing applications, and an approach to produce high-performance RP sensors at large scales.

Machine Learning-Assisted Automatically Electrochemical Addressable Cytosensing Arrays for Anticancer Drug Screening

“…Subsequently, electrochemical impedance spectroscopy (EIS) measurements of K 3 /K 4 [Fe­(CN) 6 ] on these electrode materials were implemented to further investigate the electron kinetics. Nyquist plots (Figure B) display that the semicircle diameter can be used as an indicator for the charge-transfer resistance ( R ct ), and the lower R ct value indicates the faster electron-transfer rate . The R ct values are fitted to be 217.5, 208.6, 206.3, and 149.2 Ω on LIG, LIG-TiO 2 , LIG-Pt, and LIG-TiO 2 –Pt, respectively.…”

“…Nyquist plots (Figure 2B) display that the semicircle diameter can be used as an indicator for the charge-transfer resistance (R ct ), and the lower R ct value indicates the faster electron-transfer rate. 37 The R ct values are fitted to be 217. Analytical Performance of LIG-TiO 2 −Pt-Lam-Based Electrochemical Addressable Sensing Arrays for In Vitro Detection of H 2 O 2 .…”

NIR‐Excitable POM‐Encapsulated Yb‐Bi2S3 Decorated Graphene for Wearable Photoelectrochemical Sensing

“…The diameter of the semicircle can be used to assess the charge transfer resistance (R ct ) at the electrode/solution interface, and the lower R ct value indicates a faster electron transfer rate. [56] The R ct values were evaluated to be 57.2, 24.9, 17.8, 8.2, 175.8, 261.4, and 348 Ω for the LIG, LIG-Bi 2 S 3 , LIG-Yb-Bi 2 S 3 , LIG-Yb-Bi 2 S 3 /PMA, LIG-Yb-Bi 2 S 3 /PMA@Apt, LIG-Yb-Bi 2 S 3 /PMA@Apt-BSA, and LIG-Yb-Bi 2 S 3 /PMA@Apt-BSA-NPY, respectively, by the fitted Randles equivalent circuits (Figure S12, Supporting Information). The electron transfer rate first increases with the decoration of Bi 2 S 3 , Yb-Bi 2 S 3 , and PMA, and then decreases with the further binding of aptamer, BSA, and target NPY.…”

Phosphorus-Based Nanomaterials for Biomedical Applications: A Review

“…2D nanomaterials derived from phosphorus demonstrate significant potential for use in electrochemical sensing, biosensing, and ion detection, owing to their high specific surface area and rapid electron transfer rate (Figure b). , The reactivity of few-layer or single-layer pure phosphorus nanosheets at the surface is high, but their stability in the environment is low . As a result, electrochemical sensing electrodes modified with pure phosphorus nanosheets have not been implemented in practical applications yet. , Compositing two-dimensional pure phosphorus nanomaterials with materials is an effective approach materials to enhance the poor environmental and thermal stability and improve the electrochemical sensing performance. ,, The study shows a novel photothermal sensing probe based on violet phosphorus nanosheets with satisfactory photothermal conversion efficiency (31.1%) was reported for the first time.…”