Bipolar electrochemistry paper highlighted by Langmuir

On 17th June 2016 our paper “Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry” was highlighted on the Langmuir Facebook page. The editor, Richard M. Crooks states: “What I like about this paper is that it shows the power of bipolar electrochemistry for electrochemically modifying substrates, even when the substrate is not in…

Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry

Line Koefoed, Emil Bjerglund Pedersen, Lena Thyssen, Jesper Vinther, Thomas Kristiansen, Steen U. Pedersen, and Kim Daasbjerg doi.org/10.1021/acs.langmuir.6b01309 Development of versatile methods for graphene functionalization is necessary before use in applications such as composites or as catalyst support. In this study, bipolar electrochemistry is used as a wireless functionalization method to graft 4-bromobenzenediazonium on large…

Controlled electropolymerisation of a carbazole-functionalised iron porphyrin electrocatalyst for CO2 reduction

Xin-Ming Hu, Zakaria Salmi, Mie Lillethorup, Emil B. Pedersen, Marc Robert, Steen U. Pedersen, Troels Skrydstrup and Kim Daasbjerg doi.org/10.1039/C6CC00982D Using a one-step electropolymerisation procedure, CO2 absorbing microporous carbazole-functionalised films of iron porphyrins are prepared in a controlled manner. The electrocatalytic reduction of CO2 for these films is investigated to elucidate their efficiency and the origin of their ultimate…

Grafting of Aryl Diazonium, Iodonium, and Sulfonium Salts in Unusual Patterns by Exploiting the Potential Gradient in Bipolar Electrochemistry

Line Koefoed, Steen U. Pedersen and Kim Daasbjerg doi.org/10.1002/celc.201500512 Bipolar electrochemistry makes various kinds of surface modifications possible by appropriately tuning the applied potential difference. In this study aryl diazonium, iodonium, and sulfonium salts are reductively grafted onto gold surfaces using an excess of hydroquinone to set the anode at a fixed potential. In general,…

One-step preparation of bifunctionalized surfaces by bipolar electrografting

Line Koefoed, Kyoko Shimizu, Steen Uttrup Pedersen, Kim Daasbjerg, Alexander Kuhncd and Dodzi Zigah doi.org/10.1039/C5RA20156J Bipolar electrochemistry (BPE) is widely used to trigger electrochemical reactions on conducting objects without direct electrical wiring. In this study a novel methodology is reported, which for the first time allows simultaneous deposition of two different organic films at each…

Abstract poly(phenylene sulfide) brushes on glassy carbon and stainless steel

Electrochemical procedure for constructing poly(phenylene sulfide) brushes on glassy carbon and stainless steel

Kyoko Shimizu, Frances Helen Blaikie, Mikkel Kongsfelt, Kristian Damgaard Schøler Sørensen, Steen Uttrup Pedersen, Kim Daasbjerg onlinelibrary.wiley.com/doi/10.1002/pola.27893/full A simple electrochemical approach based on potential sweeping has been developed for growing poly(phenylene sulfide) (PPS) brushes from 4,4’-disulfanediyldibenzenediazonium salt on glassy carbon and stainless steel. First, the diazonium salt becomes reduced at the substrate on the initial…

Patterned Carboxylation of Graphene Using Scanning Electrochemical Microscopy

Kristian Torbensen, Mikkel Kongsfelt, Kyoko Shimizu, Emil B. Pedersen, Troels Skrydstrup, Steen U. Pedersen, and Kim Daasbjerg doi.org/10.1021/la504500m A simple, direct, and versatile scanning electrochemical microscopy (SECM) approach for local carboxylation of multilayered graphene on nickel is demonstrated, in which carbon dioxide serves as the carboxylation agent under reductive conditions in N,N-dimethylformamide. The use of…

Facile electrochemical transfer of large-area single crystal epitaxial graphene from Ir(1 1 1)

Line Koefoed, Mikkel Kongsfelt, Søren Ulstrup, Antonija Grubišić Čabo, Andrew Cassidy, Patrick R Whelan, Marco Bianchi, Maciej Dendzik, Filippo Pizzocchero, Bjarke Jørgensen http://dx.doi.org/10.1088/0022-3727/48/11/115306 High-quality growth of graphene and subsequent reliable transfer to insulating substrates are needed for various technological applications, such as flexible screens and high speed electronics. In this paper, we present a new…