US 11,965,853 B2
Electrochemical sensors
Lynne Crawford, Harlow (GB); Andrew Meredith, Cambridge (GB); Nathan Lawrence, Wyton (GB); and Timothy Jones, Cottenham (GB)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 14/365,624
Filed by SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
PCT Filed Dec. 21, 2012, PCT No. PCT/IB2012/057638
§ 371(c)(1), (2) Date Jun. 14, 2014,
PCT Pub. No. WO2013/093888, PCT Pub. Date Jun. 27, 2013.
Claims priority of application No. 1122301 (GB), filed on Dec. 23, 2011.
Prior Publication US 2014/0367277 A1, Dec. 18, 2014
Int. Cl. G01N 27/28 (2006.01); E21B 47/00 (2012.01); G01N 27/30 (2006.01); G01N 27/48 (2006.01); G01N 33/18 (2006.01)
CPC G01N 27/28 (2013.01) [E21B 47/00 (2013.01); G01N 27/302 (2013.01); G01N 27/308 (2013.01); G01N 27/48 (2013.01); G01N 33/1886 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrochemical sensor for an analyte, the electrochemical sensor comprising:
a reference electrode comprising a first redox active compound and a working electrode comprising a second redox active compound, wherein the first redox active compound and the second redox active compound differ in sensitivity to a concentration of the analyte;
an aqueous electrolyte; and
a control unit including one or more components that apply an electrical potential to the working electrode and measure one or more of voltage or current;
wherein the first redox active compound:
comprises a ferrocenophane with at least one bridging group comprising a chain of atoms covalently attached to and connecting two cyclopentadiene rings associated with a single iron atom, wherein the chain of atoms in the bridging group is a continuous chain of at least three carbon atoms between the two cyclopentadiene rings of the ferrocenophane, and wherein a first cyclopentadiene ring of the two cyclopentadiene rings is coupled to a benzyl group via an alkoxy;
is thermally stable at an elevated temperature of about 120° C.; and
is dissolved in the aqueous electrolyte.