Flexible Superwettable Tapes for On-Site Detection of Heavy Metals

Xuecheng He, Tailin Xu, Wei Gao, Li Ping Xu, Tingrui Pan, Xueji Zhang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Bioinspired superwettable micropatterns that combine superhydrophobicity and superhydrophilicity have been proved to exhibit outstanding capacity in controlling and patterning microdroplets and possessed new functionalities and possibilities in emerging sensing applications. Here, we introduce a flexible tape-based superhydrophilic-superhydrophobic tape toward on-site heavy metals monitoring. On such a superwettable tape, capillarity-assisted superhydrophilic microwells allow directly anchoring indicators in fixed locations and sampling into a test zone via simple dip-pull from an origin specimen solution. In contrast, the superhydrophobic substrate could confine the microdroplets in the superhydrophilic microwells for reducing the amount of analytical solution. The tape-based microchip also displays excellent flexibility against stretching, bending, and torquing for expanding wearable and portable sensing devices. Qualitative and quantitative colorimetric assessments of multiplex heavy metal analyses (chromium, copper, and nickel) by the naked eye are also achieved. The superwettable tape-based platforms with a facile operation mode and accessible signal read-out represent unrevealed potential for on-site environmental monitoring.

Original languageEnglish (US)
Pages (from-to)14105-14110
Number of pages6
JournalAnalytical Chemistry
Volume90
Issue number24
DOIs
StatePublished - Dec 18 2018

ASJC Scopus subject areas

  • Analytical Chemistry

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