This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/15936 in citations.
GOLD NANOWIRE-BASED CHEMIRESISTORS.
GOLD NANOWIRE-BASED CHEMIRESISTORS.
GOLD NANOWIRE-BASED CHEMIRESISTORSMuratova I.S.1, Mourzina Y.G.2, Offenhäusser A.2, Mikhelson K.N.11Saint Petersburg State University, Saint Petersburg, Russia2Forschungszentrum Jülich, Jülich, GermanyUltrathin metal nanowires (NWs) with diameter ˂ 10 nm are of interest for various applications, in...
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Personal Name(s): | Muratova, I. S. |
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Mourzina, Youlia / Offenhäusser, Andreas / Mikhelson, K. N. | |
Contributing Institute: |
JARA-FIT; JARA-FIT Bioelektronik; PGI-8 |
Imprint: |
2015
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Conference: | IX International conference of young scientists on Chemistry “Mendeleev 2015”, St.Petersburg (Russia), 2015-04-07 - 2015-04-10 |
Document Type: |
Contribution to a conference proceedings |
Research Program: |
Controlling Configuration-Based Phenomena |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
GOLD NANOWIRE-BASED CHEMIRESISTORSMuratova I.S.1, Mourzina Y.G.2, Offenhäusser A.2, Mikhelson K.N.11Saint Petersburg State University, Saint Petersburg, Russia2Forschungszentrum Jülich, Jülich, GermanyUltrathin metal nanowires (NWs) with diameter ˂ 10 nm are of interest for various applications, in particular due to high spatial resolution of measurements, high surface area and sensitivity when NWs are used in sensor arrays. This work was focused on the techniques to assemble gold NWs on sensor chips and on the study of the gold NW sensors as chemiresistors.Two techniques were explored: (i) applying pre-synthesized NWs to electrodes using a microfluidic channel (MFC), and (ii) a direct synthesis technique (DST) when NWs were synthesized directly on the electrodes.The sensor chips were prepared on a silicon wafer using e-beam lithography. Each chip contained a number of gold electrodes with spacing of 400, 600, 800 nm, and 1 μm. Next, ultrathin gold NWs (Fig. 1) were deposited on chips using either MFC or DST technique. The latter one ensured much better contact and adhesion of NWs to the electrodes, as compared with MFC technique. PMMA insulation was applied leaving open only NWs as sensing elements (Fig. 2).The resistivity of ultrathin NWs is dependent on adsorption of species on the NW surface, and this is the origin of the chemiresistor response. Therefore, current-voltage measurements were performed in aqueous solutions of halogenides: NaF, NaCl, NaBr, NaI and pyridine over concentration range 10‒5–10‒3 M. Fluoride showed only negligible adsorption, therefore 10‒3 M NaF has been used as a background electrolyte in further measurements. The sensors also showed response to dopamine hydrochloride (DA) in phosphate buffer solution, pH 7. The response is linear vs. log of the DA concentration over the range 10−8 - 10−5 M so that the sensor appears promising for biomedical applications.Financial support from the St.Petersburg State University (grant 12.38.235.2014) is greatly acknowledged. |