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Synthesis and applications of near-infrared absorbing additive copper hydroxyphosphate

Published online by Cambridge University Press:  30 July 2018

Elena Pérez-Barrado
Affiliation:
School of Chemical and Physical Sciences, Keele University, Staffordshire ST5 5BG, UK Keeling & Walker Ltd, Whieldon Rd, Stoke-on-Trent ST4 4JA, UK
Richard J. Darton*
Affiliation:
School of Chemical and Physical Sciences, Keele University, Staffordshire ST5 5BG, UK
Dieter Guhl
Affiliation:
Keeling & Walker Ltd, Whieldon Rd, Stoke-on-Trent ST4 4JA, UK
*
Address all correspondence to Richard J. Darton at [email protected]
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Abstract

The use of copper hydroxyphosphate (Cu2PO4OH), also called libethenite, as a near-infrared (NIR) absorbing additive has been investigated. Samples were synthesized by using a hydrothermal treatment or simple wet chemical processing, which was later easily upscaled. All synthesized samples showed a strong absorption in the NIR region. Trials were conducted to produce laser-marked plastic plates and security IR ink printing tests. It was found that when incorporated in plastic and ink formulation, Cu2PO4OH added good NIR absorption properties without influencing other finished product properties too much, which confirms that it is a suitable additive that can be readily manufactured at room temperature and without pressured equipment.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2018 

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