A Micro-machined optical fibre cantilever as a miniaturised pH sensor

Jun Li, Frank Albri, Robert Maier, Wenmiao Shu, Jining Sun, Duncan Hand, William Macpherson

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
158 Downloads (Pure)


A micro-cantilever fabricated using a combination of ps-laser machining and Focused Ion Beam milling directly onto the end of a standard telecommunications optical fiber is demonstrated as a liquid pH sensor. Conventional pH meters typically require relatively large reaction volumes up to ~50 mL which is not always convenient. The micro scale nature of this sensor offers the potential for pH measurement on a smaller sample volume down to µL. The fiber end-tip cantilever is coated with a pH sensitive layer and the pH induced deflection is monitored interfermetically. A pH detectable range from pH 4.0 to pH 10.0 is demonstrated for cantilevers coated with 16-mercapto-hexadecanoic-1-acid MHA as the functional layer and pH 4.0 to pH 9.0 with Al2O3 as the functional layer.
Original languageEnglish
Pages (from-to)7221-7228
Number of pages8
JournalIEEE Sensors Journal
Issue number12
Early online date26 Aug 2015
Publication statusPublished - Dec 2015


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