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Elektriskt ledande graphene/CNT gummiband för användande som flexibla sensorer
KTH, School of Chemical Science and Engineering (CHE).
2015 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Electrically Conductive Graphene/CNT Rubberbands Used as Flexible Strain Sensors (English)
Abstract [en]

This thesis reports a novel method for producing electrically conductive nano-composites based on natural rubber (NR), by casting the composites after solvent mixing. Graphene (GE) and carbon nanotubes (CNT) were evaluated as fillers due to the compatibility that they display with natural rubber, as well as their extraordinary intrinsic conductive properties. The method allowed producing complicated shapes without compromising the properties of the NR and having a “safe-green” product (with no remains of solvent). The results showed that the dispersion obtained by this mixing process works for both GE and CNT. However, due to its beneficial shape factor, the CNT showed a conductivity 1000 times higher than the Graphene filler. This value was also 10 times higher than previously reported, and the material revealed the ability to work as an overload flexible sensor. Mechanical testing of the NR/GE and NR/CNT composites under reversible load showed lower hysteresis for GE than CNT, under the same designed testing procedure. The experimental procedure applied allowed achieving the percolation threshold needed to light up a LED (Light Emitting Diode) for both CNT and GE.

Abstract [sv]

Denna avhandling rapporterar en ny metod för framställning av elektriskt ledande nanokompositer baserade på naturgummi (NR), genom att gjuta kompositerna efter lösningsmedelsblandning. Grafen (GE) och kolnanorör (CNT) utvärderades som fyllmedel på grund av kompatibilitet att de uppvisar med naturgummi, liksom deras utomordentliga inneboende ledande egenskaper. Metoden får producera komplicerade former utan att kompromissa med egenskaperna hos NR och som har en "miljövänlig" produkt (utan rester av lösningsmedel). Resultaten visar att den dispersion som erhålles genom denna blandningsprocess fungerar för både GE och CNT. Men på grund av dess välgörande formfaktor, CNT visade en konduktivitet 1000 gånger högre än grafen filler. Detta värde var också 10 gånger högre än vad som tidigare någonsin rapporterats, och materialet visade förmågan att arbeta som en överbelastning flexibel sensor. Mekanisk provning av NR/GE och NR/CNT kompositer enligt reversibel belastning visade lägre hysteres för GE än CNT, enligt samma utformad testproceduren. Den experimentella förfarande som tillämpas tillåts nå infiltration tröskeln som krävs för att lysa upp en LED (Light Emitting Diode) för både CNT och GE.

Place, publisher, year, edition, pages
2015.
Keyword [en]
graphene, carbon nanotubes, natural rubber, flexible, sensors, nano-composites, solvents
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172446OAI: oai:DiVA.org:kth-172446DiVA: diva2:848257
Available from: 2015-08-24 Created: 2015-08-24 Last updated: 2015-08-24Bibliographically approved

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