Pillar[5]arene‐Mediated Synthesis of Gold Nanoparticles: Size Control and Sensing Capabilities |
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| Authors: | Borja Gómez Dr Ignacio Pérez‐Juste Prof Luis García‐Río Prof Luis M Liz‐Marzán Dr Jorge Pérez‐Juste Dr Isabel Pastoriza‐Santos |
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| Affiliation: | 1. Departamento de Química Física y Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago, 15782 Santiago (Spain);2. Departamento Química Física, Universidade de Vigo, 36310 Vigo (Spain);3. Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia, San Sebastián (Spain);4. Ikerbasque, Basque Foundation for Science, 48011 Bilbao (Spain) |
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| Abstract: | We present a simple procedure for the synthesis of quasi‐spherical Au nanoparticles in a wide size range mediated by macrocyclic host molecules, ammonium pillar5]arene (AP5]A). The strategy is based on a seeded growth process in which the water‐soluble pillar5]arene undergoes complexation of the Au salt through the ammonium groups, thereby avoiding Au nucleation, while acting as a stabilizer. The presence of the pillar5]arene onto the Au nanoparticle particle surface is demonstrated by surface‐enhanced Raman scattering (SERS) spectroscopy, and the most probable conformation of the molecule when adsorbed on the Au nanoparticles surface is suggested on the basis of theoretical calculations. In addition, we analyze the host–guest interactions of the AP5]A with 2‐naphthoic acid (2NA) by using 1H NMR spectroscopy and the results are compared with theoretical calculations. Finally, the promising synergetic effects of combining supramolecular chemistry and metal nanoparticles are demonstrated through SERS detection in water of 2NA and a polycyclic aromatic hydrocarbon, pyrene (PYR). |
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| Keywords: | gold host– guest chemistry nanoparticles macrocycles surface chemistry |
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