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Papers by Ashleigh Graham
The Analyst, 2013
A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-dii... more A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-diimine, tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride ([Ru(dpp) 3 ] 2+), is first ion-paired to the surface of heterogeneous TiO 2 particles, rendered negatively charged due to the alkali nature of the aqueous solution, to produce an O 2 sensitive pigment with a strikingly high oxygen sensitivity (i.e. PO 2 (S ¼ 1/2) ¼ 0.002 atm, where PO 2 (S ¼ 1/2) is defined as the amount of oxygen required to reduce the initial, oxygen free luminescence by 50%), and a rapid response to oxygen. The pigment is extruded in low density polyethylene (LDPE) to produce a thin (60 mm), flexible, O 2 sensing plastic film, with an O 2 sensitivity (PO 2 (S ¼ 1/2) ¼ 0.84 atm) comparable to the more traditional homogeneous lumophore ionpair based O 2 sensor ink films reported in the literature.
The Analyst, 2013
A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-dii... more A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-diimine, tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride ([Ru(dpp) 3 ] 2+), is first ion-paired to the surface of heterogeneous TiO 2 particles, rendered negatively charged due to the alkali nature of the aqueous solution, to produce an O 2 sensitive pigment with a strikingly high oxygen sensitivity (i.e. PO 2 (S ¼ 1/2) ¼ 0.002 atm, where PO 2 (S ¼ 1/2) is defined as the amount of oxygen required to reduce the initial, oxygen free luminescence by 50%), and a rapid response to oxygen. The pigment is extruded in low density polyethylene (LDPE) to produce a thin (60 mm), flexible, O 2 sensing plastic film, with an O 2 sensitivity (PO 2 (S ¼ 1/2) ¼ 0.84 atm) comparable to the more traditional homogeneous lumophore ionpair based O 2 sensor ink films reported in the literature.
The Analyst, 2013
A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-dii... more A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-diimine, tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride ([Ru(dpp) 3 ] 2+), is first ion-paired to the surface of heterogeneous TiO 2 particles, rendered negatively charged due to the alkali nature of the aqueous solution, to produce an O 2 sensitive pigment with a strikingly high oxygen sensitivity (i.e. PO 2 (S ¼ 1/2) ¼ 0.002 atm, where PO 2 (S ¼ 1/2) is defined as the amount of oxygen required to reduce the initial, oxygen free luminescence by 50%), and a rapid response to oxygen. The pigment is extruded in low density polyethylene (LDPE) to produce a thin (60 mm), flexible, O 2 sensing plastic film, with an O 2 sensitivity (PO 2 (S ¼ 1/2) ¼ 0.84 atm) comparable to the more traditional homogeneous lumophore ionpair based O 2 sensor ink films reported in the literature.
The Analyst, 2013
A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-dii... more A novel approach to polymeric Ru(II)-diimine luminescent O 2 sensors is described. The Ru(II)-diimine, tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride ([Ru(dpp) 3 ] 2+), is first ion-paired to the surface of heterogeneous TiO 2 particles, rendered negatively charged due to the alkali nature of the aqueous solution, to produce an O 2 sensitive pigment with a strikingly high oxygen sensitivity (i.e. PO 2 (S ¼ 1/2) ¼ 0.002 atm, where PO 2 (S ¼ 1/2) is defined as the amount of oxygen required to reduce the initial, oxygen free luminescence by 50%), and a rapid response to oxygen. The pigment is extruded in low density polyethylene (LDPE) to produce a thin (60 mm), flexible, O 2 sensing plastic film, with an O 2 sensitivity (PO 2 (S ¼ 1/2) ¼ 0.84 atm) comparable to the more traditional homogeneous lumophore ionpair based O 2 sensor ink films reported in the literature.