liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Insights into the origin of the excited transitions in graphene quantum dots interacting with heavy metals in different media
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. NASU, Ukraine.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 45, p. 30445-30463Article in journal (Refereed) Published
Abstract [en]

Exploring graphene quantum dots (GQDs) is an attractive way to design novel optical and electrochemical sensors for fast and reliable detection of toxic heavy metals (HMs), such as Cd, Hg and Pb. There are two main strategies for achieving this: (i) surface modification of an electrochemical working electrode by nanoscale GQDs and (ii) using a GQD solution electrolyte for optical sensing. Further development of these sensing technologies towards reaching or exceeding the WHO permissible limits implies deep understanding of the interaction between GQDs and HMs in different dielectric media. Solvent is expected to be one of the key factors affecting the binding ability of the GQDs to HMs and their electronic and optical properties. Here we show that the solvent-solute interaction changes the geometrical configuration, stability and absorption spectra of zigzag/armchair-edged GQDs after complexation with neutral and charged HM species. We observe physisorption behavior of Cd and Hg adatoms on the sp(2) surface with a solvent-mediated enhancement of the binding energy with increasing solvent polarity. For Pb adatoms, an opposite picture is revealed. We find that the solvent effect also manifests itself in weakening of the chemisorption strength in the HM cation-pi system with increasing dielectric constant of the solvent. Thus, a solvent engineering strategy based on control of the dielectric permittivity can be a promising approach to reach the desired binding energy in the HM@GQDs and to provide high sensitivity and selectivity of both optical and electrochemical sensors to toxic HMs we are interested in.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 19, no 45, p. 30445-30463
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:liu:diva-143610DOI: 10.1039/c7cp04711hISI: 000416054400016PubMedID: 29114656OAI: oai:DiVA.org:liu-143610DiVA, id: diva2:1165633
Note

Funding Agencies|European Union [696656]; VR [621-2014-5805]; SSF [SSF GMT14-0077, SSF RMA15-0024]; Wallenberg foundation; Angpanneforeningens Forsknings-stiftelse [16-541]

Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2018-01-02

Open Access in DiVA

The full text will be freely available from 2018-10-25 17:32
Available from 2018-10-25 17:32

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Shtepliuk, IvanKhranovskyy, VolodymyrYakimova, Rositsa
By organisation
Semiconductor MaterialsFaculty of Science & Engineering
In the same journal
Physical Chemistry, Chemical Physics - PCCP
Other Chemistry Topics

Search outside of DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 79 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf