Celery Electronics

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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.133

Celery Electronics Rhiannon Morris1,2, Holly Warren2 and Marc in het Panhuis1,2 1

School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW 2522, Australia

2 ARC Centre of Excellence for Electromaterials Science, AIIM Facility, University of Wollongong, Wollongong, NSW 2522, Australia

ABSTRACT Plants produce energy in a sustainable way, they are very effective in converting light energy into a useable form. Utilising certain parts of plants in technology could become an efficient way to enhance energy production and improve sustainability. Integrating plants with technology would offer a ‘green’ way of producing elements for electronic circuits and reduce heavy metal waste. In this paper, we demonstrate that conducting polymers can be incorporated into living system such as celery. Electrical impedance analysis was used to establish the conductivity of celery with a conducting polymer (PEDOT:PSS) into its vascular system. It was demonstrated that electronic celery exhibited conductivity values of up to 0.55 r 0.03 S/cm. This conductivity value was sufficient to demonstrate the potential of celery electronics where celery stalks are used as electrodes in simple circuits.

INTRODUCTION Plants produce energy in a sustainable way, they are very effective in converting light energy into a useable form. Utilising certain parts of plants in device technology could become an efficient way to enhance energy production and improve sustainability. Integrating plants with technology would offer a ‘green’ way of producing elements for electronic circuits and reduce heavy metal waste. As part of a plant’s reaction to chemical and environmental stimuli, they produce a range of inter and intra cellular electrical signals. These signals are transported through ion channels and enzyme-based systems, in order for a coordinated response to be achieved [1]. Signals are passed over large distances by being transported through the vascular system, so that processes can be powered throughout the plant [2]. By 847

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combining technology with plants it is possible to optimise plant functions, and use them as a source for the production of electronics or components in energy technology [3]. Integrating conductive polymers into living systems is a promising route for in situ manufacturing of elements/components for electronic circuits. Few studies have been done where living plants were utilised. It has been recognised that the vascular system is an ideal structure for optimising the plant and storing conductive polymers or other additions. A 2015 study explored the use of living roses to make conductive polymer ‘wires’ within a living system [1]. The rose stem was cut, and the fresh stem was immersed in a poly(3,4-