10.1007/s40097-021-00414-9

Porous nanocarbon particles drive large magnitude and fast photomechanical actuators

  1. Centre for Nano and Soft Matter Sciences, Bengaluru, 560013, IN Mangalore University, Mangalore, IN
  2. Centre for Nano and Soft Matter Sciences, Bengaluru, 560013, IN Dayananda Sagar College of Engineering, Bengaluru, 560078, IN
  3. Centre for Nano and Soft Matter Sciences, Bengaluru, 560013, IN Jawaharlal Nehru National College of Engineering, Shimoga, 577204, IN
  4. Centre for Nano-Materials and Displays, B.M.S. College of Engineering, Bengaluru, 560019, IN
  5. Centre for Nano and Soft Matter Sciences, Bengaluru, 560013, IN

Published in Issue 21-06-2021

How to Cite

Satapathy, P., Adiga, R., Kumar, M., Hegde, G., & Prasad, S. K. (2021). Porous nanocarbon particles drive large magnitude and fast photomechanical actuators. Journal of Nanostructure in Chemistry, 12(2 (April 2022). https://doi.org/10.1007/s40097-021-00414-9

Abstract

Abstract Better NIR (near infrared)-driven photomechanical actuation than reported for films containing carbon nanostructures such as carbon nanotubes and graphene has been achieved by incorporating porous carbon nanoparticles (PCNs) into single-layer films of polydimethylsiloxane (PDMS). The PCNs being obtained from a bio-waste source adds an exciting dimension to this work. The specific surface area ( A surf ) of the pores, controlled using the pyrolization temperature and varying over a factor of 600 is seen to have a strong influence on the magnitude of the actuation as well as the time response of light-driven and relaxation processes. The quantity of the curing agent polymerizing the PDMS also has a notable role. The already significant actuation realized for single-layer films can be further enhanced (factor of two) by backing the PDMS film with an ultrathin gold layer. This addition, however, provides a novel way to control the direction of actuation, being opposite for the single and bilayer films. The mechanical properties obtained from stress versus strain measurements and the morphology of the films as imaged by electron microscopy, besides the coefficient of thermal expansion, have been employed to analyze the various observed behaviors. An important finding from the images is that the crystallinity of the PCNs plays a vital role in the magnitude of actuation: more the amorphous nature, larger is the actuation. Based on the results, which have much for bioengineering applications, a simple photo-stimulated LED switch is also presented.

Keywords

  • Photomechanical,
  • Actuation,
  • Porous nano carbon,
  • Disorder,
  • Bilayer,
  • Photo-driven

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