**Author details**

Sanele Nyembe1 \*, Andile Mkhohlakali1 , Bambesiwe May1 and Nikiwe Mhlanga2

1 Analytical Chemistry Division/Mintek, Johannesburg, South Africa

2 DST/Mintek Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Johannesburg, South Africa

\*Address all correspondence to: saneleny@mintek.co.za

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