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| Ag NPS/g-C3N4 Nanosheets Nanocomposites Used for SERS Nanosensors |
| YU Qing-bo1, HU Kun2*, WANG Cui-ping3, LI Xian-hua2 |
1. Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
2. School of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China
3. School of Physics and Materials Science, Anhui University, Hefei 230039, China |
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Abstract The graphite-like carbon nitride (g-C3N4) nanosheets with oxygen-containing functional groups, characterized by with XRD, FTIR and XPS, were obtained by applying chemical oxidation of bulk g-C3N4. The oxygen-containing functional groups not only can be used as anchoring sites for silver nanoparticles (Ag NPs), but also help the formation of high scatter for Ag NPs in Ag NPS/g-C3N4 nanosheets nanocompposites. The weight percentage of Ag NPS in the prepared nanocomposites can be controlled by adding silver nitrate. The Ag NPS/g-C3N4 nanosheets nanocompposites are developed as a superior sensor for the detection of Co2+ ions, which are based upon Raman intensity response of g-C3N4 nanosheets to Co2+ ions. With comparison, it was found that Raman signal increase as the increasing of the concentration in Co2+. Results from the weight percentage sensitivity investigations show that Ag NPS content of 73% in nanocomposites have very low limits of detection (10-9 mol·L-1 for Co2+) in contrast with other Ag NPS content. The sensors also exhibit greater selectivity for Co2+ ions than the other metal ions (Cd2+, Cu2+ and Zn2+). The mechanism is proposed. The localized electromagnetic field is produced around the aggregated Ag NPs with the complexation between Co2+ and N/NH groups in g-C3N4 occurs, so the increase of SERS signal in the intensity can be observed. It is anticipated that Ag NPS/g-C3N4 nanosheets nanocomposites can be a new class of promising material for fabricating SERS sensors.
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Received: 2016-01-27
Accepted: 2016-04-30
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Corresponding Authors:
HU Kun
E-mail: xhli01@163.com
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