https://pubs.rsc.org/en/content/articlepdf/2014/cc/c4cc00172a

A highly sensitive electrochemical genosensor based on Co-porphyrin-labelled DNA

Electrochemical behavior of dopamine in the presence of phosphonate and the determination of dopamine at phosphonate modified zirconia films electrode with highly antifouling capability

Determination of explosives based on novel type of sensor using porphyrin functionalized carbon nanotubes

With the goal of investigating and enhancing anode performance in bulk-heterojunction (BHJ) organic photovoltaic (OPV) cells, the glass/tin-doped indium oxide (ITO) anodes are modified with a series of robust silane-tethered bis(fluoroaryl)amines to form self-assembled interfacial layers (IFLs). The modified ITO anodes are characterized by contact angle measurements, X-ray reflectivity, ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, grazing incidence X-ray diffraction, atomic force microscopy, and cyclic voltammetry. These techniques reveal the presence of hydrophobic amorphous monolayers of 6.68 to 9.76 A thickness, and modified anode work functions ranging from 4.66 to 5.27 eV. Two series of glass/ITO/IFL/active layer/LiF/Al BHJ OPVs are fabricated with the active layer = poly(3-hexylthiophene):phenyl-C71-butyric acid methyl ester (P3HT:PC71BM) or poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)-carbonyl]thi-eno[3,4-b]thiophen...

Systematic Investigation of Organic Photovoltaic Cell Charge Injection/Performance Modulation by Dipolar Organosilane Interfacial Layers

Scanning electrochemical microscopy(SECM) has made great progress in recent years with respect to both technology and applications. This manuscript is an expansion of the review published in Analytica chimica acta in the year of 2007 by our group. The review briefly presents the principle and instrumentation of SECM. Then we focus on the application of SECM in several areas such as charge transfer, solar cells, imaging, bioanalysis in recent years. SECM can capture real time (electro)chemical information at a micro interface which helps us to explore the microscopic world. SECM is also employed to investigate the complicated electron transfer system and biosamples. Last seven years literature infers SECM is a comprehensive characterization tool when it is combined with other techniques.

Recent advances in electrochemistry by scanning electrochemical microscopy

Self-assembled monolayers (SAMs) of thiol-derivatized tetraphenylporphyrin (SH-TPP) and cobalt tetraphenylporphyrin (SH-CoTPP) have been prepared to examine the structure and direct electron transfer (ET) on a gold electrode in an aqueous solution. The cyclic voltammetry peaks of the porphyrin were obviously observed in aqueous solution. An interesting phenomenon was that direct ET cannot occur in phosphate-buffered solutions when a highly oriented and tightly packed monolayer is in existence, but the relatively low-density SH-TPP SAMs exhibited good electrochemical response. The electron transfer rate constants were obtained from the impedance spectra (Cole−Cole plot), upon application of different biasing potentials to the modified electrode. We propose a new kinetic model of the ET processes of SAMs of thiol-derivatized porphyrin and apply the density functional theory (DFT) to study the ET of porphyrin molecules on Au surfaces.

Direct Electron Transfer of Thiol-Derivatized Tetraphenylporphyrin Assembled on Gold Electrodes in an Aqueous Solution

The electrochemical behavior and direct quantitative determination of paclitaxel, a poorly soluble drug made into microemulsion, were researched by cyclic voltammetry in acetate buffer solutions (pH = 4.0) at a glassy carbon electrode. The results show that the oxidation process is irreversible and controlled by diffusion. Moreover, the effects of anodic peak current (Ipa), anodic peak potential, scan rate, pH, and the electrochemical redox mechanism have been studied. The anodic peak current varied linearly with paclitaxel concentration in the range of 5 × 10−5 mol/L to 5 × 10−4 mol/L, and the detection limit was 9.15 × 10−8 mol/L. The results of RSD (0.90%) and recovery (99.22%–101.69%) were obtained. Additionally, it has been proved that one electron and one proton are involved in the electrochemical redox process. The present research has been successfully used to determine paclitaxel in pure and real samples, which further supported the electrochemical behavior investigation of paclitaxel and direct determination of micro-emulsion.

/pdf/electrochemical-behavior-and-direct-quantitative-5m6ns4kw.pdf

Electrochemical Behavior and Direct Quantitative Determination of Paclitaxel

5-[4-(3-Mercaptopropyloxy)phenyl]-10,15,20-tris (2-chlorphenyl) porphyrin was utilized for fabricating a self-assembled monolayer (SAM) on a gold electrode. Then cobalt(II) was inserted into the the monolayer by refluxing the cobalt(II) solution in which the pre-assembled porphyrin-modified electrode was immersed. The monolayers were characterized by cyclic voltammetry (CV). Oxidation and catalytic mechanisms of dopamine on the modified electrode were also investigated and elucited respectively. Catalytic currents increased linearly with dopamine (DA) concentration in the range of 1.0 × 10−9 to 2.0 × 10−3 mol/L with the correlation coefficient of 0.9989. The modified electrode can be help develop a simple, quick, sensitive, and accurate method for the determination of the biomolecules such as dopamine.

Preparation, Characterization, and Electrochemical Behaviors of Self-Assembled Monolayer on Gold Electrode Surface with Mercapto-Derivatized Cobaltous Porphyrin

The invention provides a method for studying light induced electron transfer with a scanning electrochemical microscopy (SECM). According to the method, a zinc protoporphyrin complex and benzoquinone are used to construct a light induced electron transfer process in a light system II; in the SECM, an SECM probe is used as a working electrode, conducting glass modified with the zinc protoporphyrin complex is used as a substrate electrode, and light induced electron transfer is realized through regulating the distance and electrode potential difference between the two electrodes. The method provided by the invention can be used to construct a platform for simulating a photoelectron transfer reaction in a biological system.

Method for studying light induced electron transfer

A novel platform to study the photoinduced electron transfer at a dye-sensitized solid/liquid interface.

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