Photosensitive ion channels in layered MXene membranes modified with plasmonic gold nanostars and cellulose nanofibers

Jeonghee Yeom, Ayoung Choe, Jiyun Lee, Jeeyoon Kim, Jinyoung Kim, Seung Hak Oh, Cheolhong Park, Sangyun Na, Young-Eun Shin, Youngoh Lee, Yun Goo Ro, Sang Kyu Kwak () and Hyunhyub Ko ()
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Jeonghee Yeom: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Ayoung Choe: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jiyun Lee: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jeeyoon Kim: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jinyoung Kim: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Seung Hak Oh: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Cheolhong Park: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Sangyun Na: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Young-Eun Shin: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Youngoh Lee: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Yun Goo Ro: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Sang Kyu Kwak: Korea University
Hyunhyub Ko: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Ion channels transduce external stimuli into ion-transport-mediated signaling, which has received considerable attention in diverse fields such as sensors, energy harvesting devices, and desalination membrane. In this work, we present a photosensitive ion channel based on plasmonic gold nanostars (AuNSs) and cellulose nanofibers (CNFs) embedded in layered MXene nanosheets. The MXene/AuNS/CNF (MAC) membrane provides subnanometer-sized ionic pathways for light-sensitive cationic flow. When the MAC nanochannel is exposed to NIR light, a photothermal gradient is formed, which induces directional photothermo-osmotic flow of nanoconfined electrolyte against the thermal gradient and produces a net ionic current. MAC membrane exhibits enhanced photothermal current compared with pristine MXene, which is attributed to the combined photothermal effects of plasmonic AuNSs and MXene and the widened interspacing of the MAC composite via the hydrophilic nanofibrils. The MAC composite membranes are envisioned to be applied in flexible ionic channels with ionogels and light-controlled ionic circuits.

Date: 2023
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DOI: 10.1038/s41467-023-36039-5

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