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Photoelectrochemical and Electrochemical Characterization of Sub-Micro-Gram Amounts of Organic Semiconductors Using Scanning Droplet Cell Microscopy.

Kollender JP, Gasiorowski J, Sariciftci NS, Mardare AI, Hassel AW - J Phys Chem C Nanomater Interfaces (2014)

Bottom Line: The most attractive features of the PE-SDCM are represented by the possibility of addressing small areas on the investigated substrate and the need of small amounts of electrolyte.A very small amount (ng) of the material under study is sufficient for a complete electrochemical and photoelectrochemical characterization due to the scanning capability of the cell.The electrochemical behavior of the polymer was studied in detail using potentiostatic and potentiodynamic investigations as well as electrochemical impedance spectroscopy.

View Article: PubMed Central - PubMed

Affiliation: Institute for Chemical Technology of Inorganic Materials, Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, and Christian Doppler Laboratory for Combinatorial Oxide Chemistry at the Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University Linz , Altenberger Str. 69, 4040 Linz, Austria.

ABSTRACT
A model organic semiconductor (MDMO-PPV) was used for testing a modified version of a photoelectrochemical scanning droplet cell microscope (PE-SDCM) adapted for use with nonaqueous electrolytes and containing an optical fiber for localized illumination. The most attractive features of the PE-SDCM are represented by the possibility of addressing small areas on the investigated substrate and the need of small amounts of electrolyte. A very small amount (ng) of the material under study is sufficient for a complete electrochemical and photoelectrochemical characterization due to the scanning capability of the cell. The electrochemical behavior of the polymer was studied in detail using potentiostatic and potentiodynamic investigations as well as electrochemical impedance spectroscopy. Additionally, the photoelectrochemical properties were investigated under illumination conditions, and the photocurrents found were at least 3 orders of magnitude higher than the dark (background) current, revealing the usefulness of this compact microcell for photovoltaic characterizations.

No MeSH data available.


Related in: MedlinePlus

Scheme of the photoelectrochemicalscanning droplet cell microscope(PE-SDCM).
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fig2: Scheme of the photoelectrochemicalscanning droplet cell microscope(PE-SDCM).

Mentions: All electrochemicaland photoelectrochemical measurements shown in this publication werecarried out using a special photoelectrochemical scanning dropletcell microscope adapted for the use of nonaqueous, organic-based electrolytes.The main body of the cell was made from an acrylic block (22 mm ×22 mm × 12 mm) into which three connected channels (3.3 mm indiameter) were drilled (see Figure 2). Eachchannel was sealed using polypropylene (PP) screws with an O-ringunderneath the head of each screw. A μ-Ag/AgCl system adaptedfor use in organic-based solvents was used as a micro quasi referenceelectrode (μ-QRE). The potential sensitive part of the μ-QREwas prepared by electrodeposition of AgCl on the first 10 mm of alonger 100 μm in diameter Ag wire in 1 M HCl. A detailed descriptionof the deposition process can be found elsewhere.25 The partially coated wire was inserted into a small glasscapillary for increased mechanical stability, leaving the potentialsensing part exposed outside it. To avoid contact between the uncoatedpart of the Ag wire and electrolyte, the glass capillary was sealedon both ends using two component epoxy resin (UHU GmbH, Germany).This leads to increased mechanical stability of the μ-QRE andavoids possible cross contaminations. The potential of this electrodewas 0.211 V versus standard hydrogen electrode (SHE). The counterelectrode (CE) used for the PE-SDCM was made from a flattened 100μm in diameter Au wire (99.999%, Wielandt Dentaltechnik, Germany).Flattening of the Au wire increases the surface area of the CE andresults in a high CE/WE surface ratio.


Photoelectrochemical and Electrochemical Characterization of Sub-Micro-Gram Amounts of Organic Semiconductors Using Scanning Droplet Cell Microscopy.

Kollender JP, Gasiorowski J, Sariciftci NS, Mardare AI, Hassel AW - J Phys Chem C Nanomater Interfaces (2014)

Scheme of the photoelectrochemicalscanning droplet cell microscope(PE-SDCM).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4120669&req=5

fig2: Scheme of the photoelectrochemicalscanning droplet cell microscope(PE-SDCM).
Mentions: All electrochemicaland photoelectrochemical measurements shown in this publication werecarried out using a special photoelectrochemical scanning dropletcell microscope adapted for the use of nonaqueous, organic-based electrolytes.The main body of the cell was made from an acrylic block (22 mm ×22 mm × 12 mm) into which three connected channels (3.3 mm indiameter) were drilled (see Figure 2). Eachchannel was sealed using polypropylene (PP) screws with an O-ringunderneath the head of each screw. A μ-Ag/AgCl system adaptedfor use in organic-based solvents was used as a micro quasi referenceelectrode (μ-QRE). The potential sensitive part of the μ-QREwas prepared by electrodeposition of AgCl on the first 10 mm of alonger 100 μm in diameter Ag wire in 1 M HCl. A detailed descriptionof the deposition process can be found elsewhere.25 The partially coated wire was inserted into a small glasscapillary for increased mechanical stability, leaving the potentialsensing part exposed outside it. To avoid contact between the uncoatedpart of the Ag wire and electrolyte, the glass capillary was sealedon both ends using two component epoxy resin (UHU GmbH, Germany).This leads to increased mechanical stability of the μ-QRE andavoids possible cross contaminations. The potential of this electrodewas 0.211 V versus standard hydrogen electrode (SHE). The counterelectrode (CE) used for the PE-SDCM was made from a flattened 100μm in diameter Au wire (99.999%, Wielandt Dentaltechnik, Germany).Flattening of the Au wire increases the surface area of the CE andresults in a high CE/WE surface ratio.

Bottom Line: The most attractive features of the PE-SDCM are represented by the possibility of addressing small areas on the investigated substrate and the need of small amounts of electrolyte.A very small amount (ng) of the material under study is sufficient for a complete electrochemical and photoelectrochemical characterization due to the scanning capability of the cell.The electrochemical behavior of the polymer was studied in detail using potentiostatic and potentiodynamic investigations as well as electrochemical impedance spectroscopy.

View Article: PubMed Central - PubMed

Affiliation: Institute for Chemical Technology of Inorganic Materials, Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, and Christian Doppler Laboratory for Combinatorial Oxide Chemistry at the Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University Linz , Altenberger Str. 69, 4040 Linz, Austria.

ABSTRACT
A model organic semiconductor (MDMO-PPV) was used for testing a modified version of a photoelectrochemical scanning droplet cell microscope (PE-SDCM) adapted for use with nonaqueous electrolytes and containing an optical fiber for localized illumination. The most attractive features of the PE-SDCM are represented by the possibility of addressing small areas on the investigated substrate and the need of small amounts of electrolyte. A very small amount (ng) of the material under study is sufficient for a complete electrochemical and photoelectrochemical characterization due to the scanning capability of the cell. The electrochemical behavior of the polymer was studied in detail using potentiostatic and potentiodynamic investigations as well as electrochemical impedance spectroscopy. Additionally, the photoelectrochemical properties were investigated under illumination conditions, and the photocurrents found were at least 3 orders of magnitude higher than the dark (background) current, revealing the usefulness of this compact microcell for photovoltaic characterizations.

No MeSH data available.


Related in: MedlinePlus