Article history: The porous structured zinc oxide (ZnO) microspheres decorated with silver nanoparticles (Ag NPs) have Received 14 May 2017 been fabricated as surface-enhanced Raman scattering (SERS) substrate for ultra-sensitive, highly repro- Received in revised form 14 July 2017 ducible and stable biological/chemical sensing of various organic molecules. The ZnO microspheres Accepted 24 July 2017 were hydrothermally synthesized without any template, and the Ag NPs decorated on microspheres Available online 29 July 2017 via photochemical reaction in situ, which provided stable Ag/ZnO contact to achieve a sensitive SERS response. It demonstrates a higher enhancement factor (EF) of 2.44 × 10 and a lower detection limit of Keywords: −11 −12 10 M–10 M. This porous SERS substrate could also be self-cleaned through a photocatalytic process Porous and then further recycled for the detection of same or different molecules, such as phenol red (PhR), ZnO/Ag dopamine (DA) and glucose (GLU) with ultra-low concentration and it possessed a sensitive response. SERS The excellent performances are attributed to morphology of porous microspheres, hybrid structure of Ultra-sensitive Photocatalyst semiconductor/metal and corresponding localized ﬁeld enhancement of surface plasmons. Therefore, it is expected to design the recyclable ultra-sensitive SERS sensors for the detection of biological molecules
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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