DataVXACS Applied Materials & InterfacesPaper
journal article·2018-10-17

Large-Area Silver–Stibnite Nanoporous Plasmonic Films for Label-Free Biosensing

Kandammathe Valiyaveedu Sreekanth, Weiling Dong, Qingling Ouyang, Sivaramapanicker Sreejith, Mohamed ElKabbash, Chwee Teck Lim, Giuseppe Strangi, Ken-Tye Yong, Robert E. Simpson, Ranjan Singh

ACS Applied Materials & Interfaces· Volume 10· Issue 41
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Source abstract

Abstract

The development of various plasmonic nanoporous materials has attracted much interest in different areas of research including bioengineering and biosensing because of their large surface area and versatile porous structure. Here, we introduce a novel technique for fabricating silver-stibnite nanoporous plasmonic films. Unlike conventional techniques that are usually used to fabricate nanoporous plasmonic films, we use a room-temperature growth method that is wet-chemistry free, which enables wafer-scale fabrication of nanoporous films on flexible substrates. We show the existence of propagating surface plasmon polaritons in nanoporous films and demonstrate the extreme bulk refractive index sensitivity of the films using the Goos-Hänchen shift interrogation scheme. In the proof-of-concept biosensing experiments, we functionalize the nanoporous films with biotin-thiol using a modified functionalization technique, to capture streptavidin. The fractal nature of the films increases the overlap between the local field and the immobilized biomolecules. The extreme sensitivity of the Goos-Hänchen shift allows femtomolar concentrations of streptavidin to be detected in real time, which is unprecedented using surface plasmons excited via the Kretschmann configuration.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Nanoporous metals and alloys · Gold and Silver Nanoparticles Synthesis and Applications · Anodic Oxide Films and Nanostructures

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371

Centre for Disruptive Photonic Technologies, The Photonic Institute, 50 Nanyang Avenue, Singapore 639798

Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798

CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553

Biomedical Institute for Global Health Research and Technology, National University of Singapore, Singapore 117599

Department of Physics, Case Western Reserve University, 10600 Euclid Avenue, Cleveland, Ohio 44106, United States

Department of Biomedical engineering, National University of Singapore, Singapore 117583

Department of Physics and CNR-NANOTEC UOS of Cosenza, Licryl Laboratory, University of Calabria, 87036 Rende, Italy

Funding

Agency for Science, Technology and Research · Ministry of Science and Technology of the People's Republic of China · Ministry of Education - Singapore · Biomedical Institute for Global Health Research and Technology, National University of Singapore

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