Categoría publications

In Situ Evaluation of Anticancer Monoclonal Antibody Nivolumab‐DNA Interaction Using a DNA‐Electrochemical Biosensor

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Authors: Wesley B. S. Machini Nuno V. Marques Prof. Dr. Ana Maria Oliveira‐Brett


Journal: ChemElectroChem 2019

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Electropolymerization of thiazole derivative bearing thiophene and its application in capacitors and electrochromic devices

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Authors: Kyoung-Sik Choi, Ji Woong Han, Min Hyung Kim, Miyeon Yoon, Yang-Rae Kim, In Tae Kim


Journal: Journal of Electroanalytical Chemistry, 2019

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Publication on AWSensors technology

Correlation between the interfacial ion dynamics and charge storage properties of poly(ortho-phenylenediamine) electrodes exhibiting high cycling stability

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Authors: El Mahdi Halim, Rezan Demir-Cakan, Hubert Perrot, Mama El Rhazi, Ozlem Sel

Journal: The Journal of Power Sources (2019)

 

Abstract

An integrated electrogravimetric study based on electrochemical quartz crystal microbalance (EQCM) unravels the interfacial ion transfer phenomena of the poly(ortho-phenylenediamine) (PoPD) thin film electrodes. Through a methodology coupling QCM with electrochemical impedance spectroscopy (ac-electrogravimetry), our work indicates that charge compensation process of PoPD in aqueous electrolytes (in acidified NaCl) occurs with the participation of multiple species, each playing a role at different temporal scales. The PoPD films are tested in a 2 electrode Swagelok cell in which Zn is used as both reference and counter electrodes and exhibit excellent stability over 8000 cycles with a relatively high specific capacitance of about 110 F g−1 at 30 C (0.63 mA cm−2) current density. The high rate capability and the excellent cycling stability of the PoPD electrodes are correlated to the electrolyte composition and the significant role of H+ to the charge compensation process is unravelled, which is made possible with coupled electrogravimetric methods of our study. By determining the interfacial flux dynamics and as well as the relative proportions of species transferred at the electrode/electrolyte interface, our results contribute to the understanding of the charge-discharge process of PoPD polymer, yet underexplored but emerging as a pseudo-capacitive electrode material.

You may read the full paper here.

Ultraflat Gold QCM Electrodes Fabricated with Pressure-Forming Template Stripping for Protein Studies at the Nanoscale

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Authors: Juan A. Rubio-Lara, Frederik Bergler, Simon J. Attwood, J. Michael Edwardson, Mark E. Welland


Journal: Langmuir, 2019

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Validation of quartz crystal rheometry in the megahertz frequency regime

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Authors: David E. Delgado, Lauren F. Sturdy, Craig W. Burkhart, Kenneth R. Shull

Journal: Inc. J. Polym. Sci., Part B: Polym. Phys. 2019

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Versatile and High-Throughput Polyelectrolyte Complex Membranes via Phase Inversion

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Authors: Kazi Sadman, David E. Delgado, Yechan Won, Qifeng Wang, Kimberly A. Gray, Kenneth R. Shull


Journal: ACS Appl. Mater. Interfaces, 2019, 11(17), 16018-16026.

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3D-printed Point-of-Care Platform for Genetic Testing of Infectious Diseases Directly in Human Samples Using Acoustic Sensors and a Smartphone

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Authors:
George Papadakis, Alexandros K. Pantazis, Maria Ntogka, Konstantinos Parasyris, Gesthimani-Ioanna Theodosi, Georgia Kaprou, Electra Gizeli

Journal:
ACS Sens. 2019, 45, 1329-1336

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Examination of High Frequency MHz Rheology of Filled Polymer Composites and Photopolymers

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Author:
Chyi-Huey Joshua Ye

Ph.D. Thesis

Northwestern University, Department of Materials Science and Engineering, September, 2017

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Enhancement of Sensitivity in Measurement of Small Molecules by Surface Acoustic Wave Immunobiosensors

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Authors: Ş. Şeyda Pirinçci, Özlem Ertekin, Zafer Ziya Öztürk, Selma Öztürk

Conference: Fourth International Congress on Biomaterials and Biosensors (BIOMATSEN 2019)

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Tuning Charge Storage Properties of Supercapacitive Electrodes Evidenced by In Situ Gravimetric and Viscoelastic Explorations

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Journal:  Anal. Chem.

Authors:  FWanli Gao, Catherine Debiemme-Chouvy, Mohammed Lahcini, Hubert Perrot, and Ozlem Sel

Abstract: Revealed by an integrated electrogravimetric and viscoelastic method, slightly electrochemically reduced graphene oxide (ERGO) presents an anion preference for charge storage and delivery, while with the progressive removal of oxygen functionalities on its basal planes, cations begin to predominate in charge compensation. This “anion-to-cation” evolution in neutral aqueous media can not only affect the electrochemical charge storage, but also play an important role in electrode’s viscoelasticity. It was demonstrated that oxygen functionalities could modify the interactions between graphene layers and even contribute to pseudocapacitances. However, the role of oxygen functionalities in species transfer and viscoelastic variations still remains poorly understood. Herein, a combined methodology of electrochemical quartz crystal microbalance (EQCM), ac-electrogravimetry and electroacoustic impedance measurements was proposed for characterizing the electrochemical and viscoelastic responses of graphene oxides with various degree of electrochemical reduction. With the removal of oxygen containing functional groups, ERGO electrode exhibits (i) a gradually enhanced specific capacitance (Cs) with increased flexibility (decreased storage moduli, G′); (ii) a dehydration process of cations (i.e., from Na+·2H2O to Na+·H2O); and (iii) a potential-dependent “stiffened-softened” behavior. These results open the door for a suitable design of GO-based materials for electrochemical energy storage and shed light on electronic devices where ion-selective behavior plays a key role.Keywords: Electrochemical Quartz crystal microbalance, ,

Link: https://pubs.acs.org/doi/abs/10.1021/acs.analchem.8b04886