Gold nanoshell arrays-based visualized sensors of pH: Facile fabrication and high diffraction intensity
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Zhou, H.L. Li, L.F. Hang, X.Y. Li, D.L. Liu, and W.P. Cai Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
L.M. Qi College of Chemistry, Peking University, Beijing 100871, People’s Republic of China
L.B. Li National Synchrotron Radiation Lab and College of Nuclear Science and Technology, CAS Key Lab of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
Y. Lia) Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China (Received 8 December 2016; accepted 11 January 2017)
A free standing 2D PS colloidal crystal with Au nanoshells/hydrogel composite film (CAuHCF) was fabricated by embedding a 2D PS colloidal crystal with Au nanoshells into a polyacrylic acid (PAA) hydrogel film. This CAuHCF can act as a visualized sensor with high diffraction intensity. The 2D PS colloidal crystal with Au nanoshells was prepared by depositing an Au layer on PS colloidal crystal obtained by interfacial self-assembly. The diffraction intensity of the CAuHCF was increased by about 30-fold than that of traditional 2D PS colloidal crystal/hydrogel composite film on transparent substrate due to large scattering cross section of Au shell. Such sensors based Au nanoshells array with the simple preparation process and the strong diffraction signal are promising ones for practical applications in visual detection. Additionally, with the simple preparation process and high diffraction intensity, other visualized sensors based different hydrogel matrix and the 2D PS colloidal crystal with Au nanoshells could be synthesized for monitoring various analysts.
I. INTRODUCTION
Recently, special nanomaterials as viable alternative to chemical sensors and biosensors have attracted extensive attention due to their associated properties with some molecular recognition.1 Numerous methods have been developed to detect chemical and biological species by these nanomaterials, such as electrochemistry, fluorescence, Raman spectrum, and many others.2–7 However, most of these technologies require utilization of sophisticated equipment and professional operators. The ideal sensing technology would realize simple, inexpensive, and quickly detecting. Hydrogel photonic crystals (HPCs) as visualized detecting technologies were popular and attractive because they could detect target analytes by naked eyes.8–13 HPCs utilize a periodic array of colloidal Contributing Editor: Edson Roberto Leite a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.34
particles embedded in a smart responsive hydrogel matrix which contains chemical or biological recognition in response to external stimuli.13 The highly ordered periodic array with a certain lattice-spacing embedded in hydrogel can diffract light in the visible region.
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