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Surface-enhanced Raman spectroscopy substrates created via electron beam lithography and nanotransfer printing.
ACS Nano. 2008 Feb; 2(2):377-85.AN

Abstract

The development of quantitative, highly sensitive surface-enhanced Raman spectroscopy (SERS) substrates requires control over size, shape, and position of metal nanoparticles. Despite the fact that SERS has gained the reputation as an information-rich spectroscopy for detection of many classes of analytes, in some isolated instances down to the single molecule detection limit, its future development depends critically on techniques for nanofabrication. Herein, an unconventional nanofabrication approach is used to produce efficient SERS substrates. Metallic nanopatterns of silver disks are transferred from a stamp onto poly(dimethysiloxane) (PDMS) to create nanocomposite substrates with regular periodic morphologies. The stamp with periodic arrays of square, triangular, and elliptical pillars is created via electron beam lithography (EBL) of ma-N 2403 resist. A modified cyclodextrin is thermally evaporated onto the stamp to overcome the adhesive nature of the EBL resist and to function as a releasing layer. Subsequently, Ag is physically vapor deposited onto the stamp at a controlled rate and thickness and used directly for nanotransfer printing (nTP). Stamps, substrates, and the efficiency of the nTP process were explored by scanning electron microscopy. Transferred Ag nanodisk-PDMS substrates are studied by SERS using Rhodamine 6G as the probe analyte. There are observed optimal conditions involving both Ag and cyclodextrin thickness. The SERS response of metallic nanodisks of various shapes and sizes on the original stamp is compared to the corresponding nTP created substrates with similar trends observed. Limits of detection for crystal violet and Mitoxantrone are approximately 10(-8) and 10(-9) M, respectively. As an innovative feature of this approach, we demonstrate that physical manipulation of the PDMS post-nTP can be used to alter morphology, e.g., to change internanodisk spacing. Additionally, stamps are shown to be reusable after the nTP process, adding the potential to scale-up regular morphology substrates by a stamp-and-repeat methodology.

Authors+Show Affiliations

Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19206640

Citation

Abu Hatab, Nahla A., et al. "Surface-enhanced Raman Spectroscopy Substrates Created Via Electron Beam Lithography and Nanotransfer Printing." ACS Nano, vol. 2, no. 2, 2008, pp. 377-85.
Abu Hatab NA, Oran JM, Sepaniak MJ. Surface-enhanced Raman spectroscopy substrates created via electron beam lithography and nanotransfer printing. ACS Nano. 2008;2(2):377-85.
Abu Hatab, N. A., Oran, J. M., & Sepaniak, M. J. (2008). Surface-enhanced Raman spectroscopy substrates created via electron beam lithography and nanotransfer printing. ACS Nano, 2(2), 377-85. https://doi.org/10.1021/nn7003487
Abu Hatab NA, Oran JM, Sepaniak MJ. Surface-enhanced Raman Spectroscopy Substrates Created Via Electron Beam Lithography and Nanotransfer Printing. ACS Nano. 2008;2(2):377-85. PubMed PMID: 19206640.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Surface-enhanced Raman spectroscopy substrates created via electron beam lithography and nanotransfer printing. AU - Abu Hatab,Nahla A, AU - Oran,Jenny M, AU - Sepaniak,Michael J, PY - 2009/2/12/entrez PY - 2009/2/12/pubmed PY - 2009/3/21/medline SP - 377 EP - 85 JF - ACS nano JO - ACS Nano VL - 2 IS - 2 N2 - The development of quantitative, highly sensitive surface-enhanced Raman spectroscopy (SERS) substrates requires control over size, shape, and position of metal nanoparticles. Despite the fact that SERS has gained the reputation as an information-rich spectroscopy for detection of many classes of analytes, in some isolated instances down to the single molecule detection limit, its future development depends critically on techniques for nanofabrication. Herein, an unconventional nanofabrication approach is used to produce efficient SERS substrates. Metallic nanopatterns of silver disks are transferred from a stamp onto poly(dimethysiloxane) (PDMS) to create nanocomposite substrates with regular periodic morphologies. The stamp with periodic arrays of square, triangular, and elliptical pillars is created via electron beam lithography (EBL) of ma-N 2403 resist. A modified cyclodextrin is thermally evaporated onto the stamp to overcome the adhesive nature of the EBL resist and to function as a releasing layer. Subsequently, Ag is physically vapor deposited onto the stamp at a controlled rate and thickness and used directly for nanotransfer printing (nTP). Stamps, substrates, and the efficiency of the nTP process were explored by scanning electron microscopy. Transferred Ag nanodisk-PDMS substrates are studied by SERS using Rhodamine 6G as the probe analyte. There are observed optimal conditions involving both Ag and cyclodextrin thickness. The SERS response of metallic nanodisks of various shapes and sizes on the original stamp is compared to the corresponding nTP created substrates with similar trends observed. Limits of detection for crystal violet and Mitoxantrone are approximately 10(-8) and 10(-9) M, respectively. As an innovative feature of this approach, we demonstrate that physical manipulation of the PDMS post-nTP can be used to alter morphology, e.g., to change internanodisk spacing. Additionally, stamps are shown to be reusable after the nTP process, adding the potential to scale-up regular morphology substrates by a stamp-and-repeat methodology. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/19206640/Surface_enhanced_Raman_spectroscopy_substrates_created_via_electron_beam_lithography_and_nanotransfer_printing_ L2 - https://doi.org/10.1021/nn7003487 DB - PRIME DP - Unbound Medicine ER -