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Article

Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC

1
Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
2
Office of the Texas State Chemist, Texas A&M AgriLife Research, Texas A&M University System, College Station, TX 77841, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1621; https://doi.org/10.3390/nano9111621
Received: 10 October 2019 / Revised: 1 November 2019 / Accepted: 12 November 2019 / Published: 15 November 2019
Surface-enhanced Raman spectroscopy (SERS) has been widely investigated in many applications. However, only little work has been done on using SERS for the detection of volatile organic compounds (VOCs), primarily due to the challenges associated with fabricating SERS substrates with sufficient hotspots for signal enhancement and with the surface interfacially compatible for the VOCs. This study investigated the phase transfer of Ag-nanospheres (AgNSs) from the aqueous phase to the non-aqueous phase by electrostatic interaction induced by cationic surfactants, and the feasibility of the transferred AgNSs as SERS substrates for the determination of methyl salicylate VOC. Results indicated that one of three cationic surfactants, tetraoctylammonium bromide (TOAB) dissolved in organic solvent showed successful phase transfer of the AgNSs confirmed by several characterization analyses. The complex formed by hydrophobic interaction between the transferred AgNSs and Tenax-TA adsorbent polymer was able to be utilized as a SERS substrate, and the volatile of methyl salicylate could be easily determined from SERS measurements at 4 h static volatile collection. Therefore, the proposed new techniques can be effectively employed to areas where many VOCs relevant to food and agriculture need to be analyzed. View Full-Text
Keywords: surface-enhanced Raman spectroscopy (SERS); Ag-nanosphere (AgNS); phase transfer; surfactant; electrostatic interaction; volatile organic compounds (VOCs) surface-enhanced Raman spectroscopy (SERS); Ag-nanosphere (AgNS); phase transfer; surfactant; electrostatic interaction; volatile organic compounds (VOCs)
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MDPI and ACS Style

Park, J.; Thomasson, J.A.; Fernando, S.; Lee, K.-M.; Herrman, T.J. Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC. Nanomaterials 2019, 9, 1621. https://doi.org/10.3390/nano9111621

AMA Style

Park J, Thomasson JA, Fernando S, Lee K-M, Herrman TJ. Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC. Nanomaterials. 2019; 9(11):1621. https://doi.org/10.3390/nano9111621

Chicago/Turabian Style

Park, Jinhyuk, J. Alex Thomasson, Sandun Fernando, Kyung-Min Lee, and Timothy J. Herrman. 2019. "Complexes Formed by Hydrophobic Interaction between Ag-Nanospheres and Adsorbents for the Detection of Methyl Salicylate VOC" Nanomaterials 9, no. 11: 1621. https://doi.org/10.3390/nano9111621

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