Functionalisation of recombinant spider silk with conjugated polyelectrolytes

Müller, Christian; Jansson, Ronnie; Elfwing, Anders; Askarieh, Glareh; Karlsson, Roger H.; Hamedi, Mahiar; Rising, Anna; Johansson, Jan; Inganäs, Olle; Hedhammar, My

doi:10.1039/c0jm03270k

Cited by 24 publications

(34 citation statements)

References 45 publications

(70 reference statements)

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“…In basic electrolytes, the polymer backbone will be undoped, as evidenced by the dark blue/purple colour of the PEDOT-S:H film, which results from absorption by the π-π * transition at 500-600 nm. 12 This means that the butane-sulphonate side chains of PEDOT-S:H will no longer be needed for charge compensation and will therefore be strongly dissociated, both interand intra-molecularly due to the excess negative charge present. Gentle agitation of the electrolyte will completely remove the film from the underlying substrate.…”

Section: Resultsmentioning

confidence: 99%

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Electronic Control over Detachment of a Self-Doped Water-Soluble Conjugated Polyelectrolyte

Persson

Gabrielsson

Sawatdee³

et al. 2014

Langmuir

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Water-soluble conducting polymers are of interest to enable more versatile processing in aqueous media as well as to facilitate interactions with biomolecules. Here, we report a substituted poly(3,4-ethylenedioxythiophene) derivative (PEDOT-S:H) that is fully water-soluble and selfdoped. When electrochemically oxidizing a PEDOT-S:H thin film, the film detaches from the under-laying electrode. The oxidation of PEDOT-S:H starts with an initial phase of swelling followed by cracking before it finally disrupts into small flakes and detaches from the electrode.We investigated the detachment mechanism and found that parameters such as the size, charge and concentration of ions in the electrolyte, the temperature and also the pH influence the characteristics of detachment. When oxidizing PEDOT-S:H, the positively charged polymer backbone is balanced by anions from the electrolyte solution and also by the sulphonate groups 2 on the side chains (more self-doping). From our experiments, we conclude that detachment of the PEDOT-S:H film upon oxidation occurs in part due to swelling caused by an inflow of solvated anions and associated water, and in part due to chain rearrangements within the film, caused by more self-doping. We believe that PEDOT-S:H detachment can be of interest in a number of different applications, including addressed and active control of the release of materials such as biomolecules and cell cultures.

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Section: Resultsmentioning

confidence: 99%

“…[11][12][13] One route to achieve water-solubility in conducting polymers is to introduce charged side groups to the monomer. Such covalently bonded substituents may also make the resulting polymer self-doped, 14 meaning that the required counter ion during doping is a side group of the polymer chain itself.…”

Section: Introductionmentioning

confidence: 99%

Electronic Control over Detachment of a Self-Doped Water-Soluble Conjugated Polyelectrolyte

Persson

Gabrielsson

Sawatdee³

et al. 2014

Langmuir

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“…The temperature and higher concentration of the coating material was probably necessary to be able to penetrate the bulk of the fibril as visible in Figure 24. 32 A similar approach have later been applied to bombyx moori silk 35 . Although only few attempts have been made to characterize the nature of the interaction between the peptide structures and PEDOT-S it is assumed that it is an entropy driven process as discussed in the theory section.…”

Section: Figure 23 Stabilizing Effect Of the Decoration Procedure A)mentioning

confidence: 99%

“…This color change is also true when dedoping a thin film of PEDOT-S using electrochemical means 28 . 32 .…”

Section: Figure 9 Schematic Polymerization Route Of Pedot-s the Monomentioning

confidence: 99%

“…The PEDOT-S molecule, with is intriguing properties, have found applications in selfassembly [31][32][33][34][35][36][37] , solar cells 38,39 , light emitting diodes 40 , bioorganic electronics 29,41,42 , electrochemical transistors 43 and nanoelectronics 44 . Cai et al used PEDOT-S as hole transporting layer in organic solar cells and used UV-ozone to increase the workfunction of the material 39 .…”

Section: Figure 11 Uv-vis Spectra Of Pedot-s When Subjected To Differmentioning

confidence: 99%

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On decoration of biomolecular scaffolds with a conjugated polyelectrolyte

Elfwing¹

Self Cite

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Biotemplating is the art of using a biological structure as a scaffold which is decorated with a functional material. In this fashion the structures will gain new functionalities and biotemplating offers a simple route of mass-producing mesoscopic material with new interesting properties. Biological structures are abundant and come in a great variety of elaborate and due to their natural origin they could be more suitable for interaction with biological systems than wholly synthetic materials. Conducting polymers are a novel class of material which was developed just 40 years ago and are well suited for interaction with biological material due to their organic composition. Furthermore the electronic properties of the conducting polymers can be tuned giving rise to dynamic control of the behavior of the material. Self-assembly processes are interesting since they do not require complicated or energy demanding processing conditions. This is particularly important as most biological materials are unstable at elevated temperatures or harsh environments. The main aim of this thesis is to show the possibility of using self-assembly to decorate a conducting polymer onto various biotemplates. Due to the intrinsic variety in charge, size and structure between the available natural scaffolds it is difficult, if not impossible, to find a universal method.In this thesis we show how biotemplating can be used to create new hybrid materials by self-assembling a conducting polymer with biological structures based on DNA, protein, lipids and cellulose, and in this fashion create material with novel optical and electronic properties. vi vii Populärvetenskaplig sammanfattningModernistisk arkitektur bygger på att låta formen skulle följa funktionen; med andra ord ska byggnadens utseende framförallt vara avhängigt vad den ska användas till. I detta arbete har vi gjort det diametralt motsatta och låtit funktionen följa formen. Den funktion vi valt att använda är elektrisk ledningsförmåga och vi har låtit naturen ta fram formerna. I naturen finner vi en nästan oändlig mängd av intrikata former, må det vara spiraler, trådar eller bollar. Ett genomgående tema är dock att dessa strukturer sällan har någon elektrisk ledningsförmåga. För att få den funktion som vi önskar har vi använt en elektrisk ledande polymer, ett material som i sig är svårt att forma. Genom att variera de förhållanden som krävs för att den ledande polymeren ska interagera med strukturen har vi fått den ledande polymeren (funktionen) att följa strukturen (formen) och därmed skapat nya material med helt nya egenskaper. Huvudsyftet med denna avhandling är att påvisa att det med förhållandevis enkla metoder går att skapa nya material och att i framtiden möjligen kan använda dessa metoder för att skapa byggstenar i elektroniska komponenter.För att förstå hur vi gått tillväga måste vi beakta att det finns en grundläggande skillnad i människans och naturens tillverkningsmetoder. Människan använder kraft, hög temperatur och farliga kemikalier för att smälta, bearbeta ...

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Bio‐Based Materials as Templates for Electronic Devices

Müller¹,

Inganäs²

2012

Stretchable Electronics

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Functionalisation of recombinant spider silk with conjugated polyelectrolytes

Cited by 24 publications

References 45 publications

Electronic Control over Detachment of a Self-Doped Water-Soluble Conjugated Polyelectrolyte

Electronic Control over Detachment of a Self-Doped Water-Soluble Conjugated Polyelectrolyte

On decoration of biomolecular scaffolds with a conjugated polyelectrolyte

Bio‐Based Materials as Templates for Electronic Devices

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