Publications

Graphene/Silicon Heterojunction Schottky Diode for Vapors Sensing Using Impedance Spectroscopy

Ali Fattah, Saeid Khatami, Carmen C. Mayorga-Martinez, Mariana Medina-Sánchez, Luis Baptista-Pires and Arben Merkoçi. Small, 10 (20), 4193–4199. 2014
A graphene(G)/Silicon(Si) heterojunction Schottky diode and a simple method that evaluates its electrical response to different chemical vapors using electrochemical impedance spectroscopy (EIS) are implemented. To study the impedance response of the device of a given vapor, relative impedance change (RIC) as a function of the frequency...

Electrochemical impedance spectroscopy (bio)sensing through hydrogen evolution reaction induced by gold nanoparticles

Carmen C. Mayorga-Martinez , Alejandro Chamorro-García , Arben Merkoçi. Biosensors and Bioelectronics, Volume 67, 15 May 2015, Pages 53–58
A new gold nanoparticles (AuNPs) based detection strategy using Electrochemical Impedance Spectroscopy (EIS) through Hydrogen Evolution Reaction (HER) is proposed. This EIS-HER method is used as an alternative to the conventional EIS based on [Fe(CN)6]3−/4− or [Ru(NH3)6]3+/2+ indicators. The proposed method is based on the HER...

Electroanalysis-Based Clinical Diagnostics

Arben Merkoçi . Electroanalysis, Volume 26, Issue 6, page 1110, June 2014
Special Issue of Electroanalysis “Electroanalysis-Based Clinical Diagnostics” for which prof. Arben Merkoçi is Guest Editor. [Link to the article] [Ask for pdf]

Electrocatalytic tune of biosensing response through electrostatic or hydrophobic enzyme – graphene oxide interactions

Luis Baptista-Pires, B. Pérez-López, Carmen C. Mayorga-Martinez, Eden Morales-Narváez, Neus Domingo, Maria Jose Esplandiu, Francesc Alzina, C.M. Sotomayor Torres, A. Merkoçi. Biosensors & BioelectronicsVolume, 2014, 61,655–662
The effect of graphene oxidative grades upon the conductivity and hydrophobicity and consequently the influence on an enzymatic biosensing response is presented. The electrochemical responses of reduced graphene oxide (rGO) have been compared with the responses obtained from the oxide form (oGO) and their performances have been accordingly...

Nano/Micromotors in (Bio)chemical Science Applications

Maria Guix, Carmen C. Mayorga-Martinez and Arben Merkoçi. Chemical Review, 2014, 114 (12), pp 6285–6322
Herein we present  a review of the state-of-the-art in nano- and micromotors for biological and chemical applications, addressing the diverse array of components, operational mechanisms, and energy sources employed. Although research in nano/micromotor design, fabrication, and applications is multidisciplinary, the pillar of this...

Alzheimer Disease Biomarker Detection Through Electrocatalytic Water Oxidation Induced by Iridium Oxide Nanoparticles

Lourdes Rivas, Alfredo de la Escosura-Muñiz,Josefina Pons and Arben Merkoçi. Electroanalysis, 2014, 26 (6), 1287–1294
Iridium oxide nanoparticles (IrO2 NPs) synthesized following a previously reported chemical route are presented as novel tags for immunosensing taking advantage of their electrocatalytic activity towards water oxidation reaction (WOR). Cyclic voltammetry and chronoamperometry for the evaluation of the IrO2 NPs electrocatalytic activity...

Extremely fast and high Pb2+ removal capacity using a nanostructured hybrid material

Adaris Lopez-Marzo, Josefina Pons and Arben Merkoçi . J. Mater. Chem. A, 2014,2, 8766-8772
Ultra-fast toxic metals removal using a hybrid and nanostructured vaterite- poly(ethyleneimine) (NV-PEI) is reported. Especially for Pb2+ an extremely high and fast adsorption capacity without precedents is observed. Within a 3 min contact time (CT) 97-100% of Pb2+ contaminant in water samples at pH 6 with a large concentrations...

Micromotor Enhanced Microarray Technology for Protein Detection

Eden Morales-Narváez, Maria Guix, Mariana Medina-Sánchez, Carmen C. Mayorga-Martinez, Arben Merkoçi. Small, Issue Small Small, 2014, 10, (13), 2542–2548
Microengines meet microarray technology. The transport of a target molecule toward a sensing surface can play a critical role in biodetection performance. The mixing induced by the motion of self-propelled micromotors can assist such transport and consequently enhance the performance of surface–based biosensing systems, particularly...

Iridium oxide nanoparticles induced dual catalytic/inhibition based detection of phenol and pesticide compounds

Carmen Mayorga, Flavio Pino, Sevinc Kurbanoglua, Lourdes Rivas, Sibel A Ozkan and Arben Merkoçi . Journal of Materials Chemistry B, 2014, 2, 2233-2239
Environmental pollution control technology has a great demand for detection systems, particularly for pesticides and phenolic compounds. Moreover, analytical systems are highly requested for the dual detection of different pollutants using the same platform. In that direction, a new, reliable, easy to use and disposable biosensor...

Supramolecular Interaction of Dopamine with β−Cyclodextrin: An Experimental and Theoretical Electrochemical Study

M. Palomar-Pardavé, S. Corona-Avendaño, M. Romero-Romo, G. Alarcón-Angeles, A. Merkoçi, M.T. Ramírez-Silva . Journal of Electroanalytical Chemistry, 2014, 717-718, pp 103-109
This work presents the construction of a supramolecular system formed by the surface modification of a carbon paste electrodes (CPE) with a novel conducting polymer produced by electrochemical polymerization of β-cyclodextrin, β-CD, (CPE/poly-β-CD). With the bare CPE and the modified-CPE, an electrochemical study was performed...