Basic Information
Abstract Number: 2190-6    
Author Name: Maxim B Joseph Affiliation: University of Warwick
Session Title: Electrodes and Electrode Surfaces
Event Type: Oral Sessions
Event Title: All Diamond Conductivity Measurement Device
Presider(s): Stauffer, Mark T Start Time: 10:25 AM ( Slot # 7 )
Date: Thursday, March 6th, 2014 Location: S502a
Keywords: Electrode Surfaces, Electrodes, Sensors

Dalmira, KyriacoullaUniversity of Warwick
Macpherson, Julie VUniversity of Warwick
Newton, Mark EUniversity of Warwick

Abstract Content
Measurement of solution conductivity is crucial for many industries and is used e.g. in waste water treatment, desalinisation, food preparation, pharmaceutical, quality control, analysis, etc. Especially for in situ use, a desirable quality is a calibration free sensor. For working in challenging environments e.g. high temperature/pressure, acidic/basic, the conductivity meter must also be robust and durable. A conductivity sensor fabricated entirely from diamond meets the required attributes. Here we describe the construction and application of an all diamond conductivity sensor for the determination of conductivity across a range covering up to seven orders of magnitude. The sensor is made from intrinsic diamond, machined to produce trenches of varying thickness and separation, which is then overgrown with conducting boron doped diamond (BDD) and polished flat to produce a co-planar structure comprising BDD bands insulated by intrinsic diamond (Figure 1). Results are presented which demonstrate the workable range, reliability, repeatability, use in extreme environments and for lengthy periods of time, in situ.