PMID- 28435954
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180202
LR  - 20180202
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 19
IP  - 18
DP  - 2017 May 10
TI  - Electrostatically stabilized hybrids of carbon and maghemite nanoparticles: 
      electrochemical study and application.
PG  - 11668-11677
LID - 10.1039/c7cp01486d [doi]
AB  - Binary hybrids have been investigated for the past few decades due to the 
      emerging properties of nanoparticle composites. Electrostatically stabilized 
      core-shell nanostructures composed of surface active magnetic nanoparticles 
      (SAMNs) and differently charged carbon nanomaterials display specific 
      electrochemical properties. In this work, a set of binary hybrids that include a 
      new class of magnetic nanoparticles is presented and the electrochemical features 
      of the hybrids are reported. Gallic acid derived carbon dots (GA-CDs), PEG 
      derived graphene dots (PEG-GDs), and quaternized carbon dots (Q-CDs) 
      characterized by different charged groups were used for the preparation of 
      different complexes with SAMNs. Thus, a set of six binary nanomaterials was 
      obtained, and characterized by electrochemical impedance spectroscopy, cyclic 
      voltammetry and chronoamperometry, demonstrating significant differences in the 
      charge transfer resistance, capacitive current, electrochemical performance, and 
      reversibility with respect to the isolated subunits. Among them, the combination 
      of Q-CDs with an excess of SAMNs led to a Q-CD@SAMN hybrid, which displayed 
      peculiar electrocatalytic properties attributable to the influence of the strong 
      electrostatic interactions exerted by Q-CDs on the SAMN surface. Notwithstanding 
      their small fraction (around 1% w/w), Q-CDs oriented the electrocatalysis of 
      SAMNs toward the selective electro-oxidation of polyphenols at low applied 
      potentials (+0.1 V vs. SCE). Finally, the Q-CD@SAMN hybrid was used for the 
      development of a coulometric sensor for polyphenols, composed of a simple carbon 
      paste electrode in a small volume electrochemical flow cell (1 muL), and used for 
      the complete direct electro-oxidation of polyphenols from plant extracts.
FAU - Baratella, D
AU  - Baratella D
AD  - Department of Comparative Biomedicine and Food Science, University of Padua, 
      viale dell'Universita 16, Legnaro (PD), 35020, Italy. fabio.vianello@unipd.it.
FAU - Magro, M
AU  - Magro M
FAU - Jakubec, P
AU  - Jakubec P
FAU - Bonaiuto, E
AU  - Bonaiuto E
FAU - de Almeida Roger, J
AU  - de Almeida Roger J
FAU - Gerotto, E
AU  - Gerotto E
FAU - Zoppellaro, G
AU  - Zoppellaro G
FAU - Tucek, J
AU  - Tucek J
FAU - Safarova, K C
AU  - Safarova KC
FAU - Zboril, R
AU  - Zboril R
FAU - Cecconello, A
AU  - Cecconello A
FAU - Willner, I
AU  - Willner I
FAU - Santagata, S
AU  - Santagata S
FAU - Sambo, P
AU  - Sambo P
FAU - Vianello, F
AU  - Vianello F
LA  - eng
PT  - Journal Article
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
EDAT- 2017/04/25 06:00
MHDA- 2017/04/25 06:01
CRDT- 2017/04/25 06:00
PHST- 2017/04/25 06:00 [pubmed]
PHST- 2017/04/25 06:01 [medline]
PHST- 2017/04/25 06:00 [entrez]
AID - 10.1039/c7cp01486d [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2017 May 10;19(18):11668-11677. doi: 10.1039/c7cp01486d.