Multicomponent System of Single-Walled Carbon Nanotubes Functionalized with a Melanin-Inspired Material for Optical Detection and Scavenging of Metals

Verena Wulf, Ella Bichachi, Adi Hendler-Neumark, Tlalit Massarano, Avigail Baruch Leshem, Ayala Lampel, Gili Bisker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The accumulation of metal ions in organisms and the presence of heavy metals in water cause adverse effects on ecosystems and results in numerous human health issues such as cancer and neurogenerative diseases. Therefore, the development of novel platforms for metal-scavenging and rapid metal detection for in situ applications are of high importance. Here, this challenge is tackled by taking advantage of the metal chelation ability of a melanin-inspired material in combination with the near-infrared (NIR) fluorescence response of single-walled carbon nanotubes (SWCNTs) to surface binding. SWCNTs are functionalized by a melanin-like substance, obtained by enzymatic oxidative polymerization of a fluorenylmethyloxycarbonyl-tyrosine (FmocY) precursor. The resulting multicomponent system (SWCNT-FmocYOx) serves as a metal-ion scavenging platform that concurrently reports on metal binding with optical signal transduction. Upon binding of a library of mostly divalent transition metal-ions, the fluorescence emission of the functionalized SWCNTs is modulated, showing a concentration-dependent response with a limit of detection in the nanomolar range. Metal-binding and removal from water of up to 98% is further shown via inductively coupled plasma mass spectrometry. The SWCNT-FmocYOx hybrid system presents a novel platform with NIR optical signal for real-time feedback on metal-ion scavenging.

Original languageEnglish
Article number2209688
JournalAdvanced Functional Materials
Volume32
Issue number49
DOIs
StatePublished - 2 Dec 2022

Keywords

  • Fmoc-tyrosine
  • bioinspired materials
  • fluorescent nanoparticles
  • melanin
  • optical nanosensors
  • single-walled carbon nanotubes

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