Thermoplasmonic Maskless Lithography on Upconverting Nanocomposites Assisted by Gold Nanostars

Author(s)

Martinez, Eduardo D. ^{[1, 2]} ; Urbane, Ricardo R. ^[1] ; Rettori, Carlos ^{[1, 3]}

Affiliation

^[1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys IFGW, BR-13083859 Campinas, SP - Brazil

^[2] Consejo Nacl Invest Cient & Tecn CONICET, CNEA, Ctr Atom Bariloche, INN, Av E Bustillo 9500, R8402AGP, San Carlos De Bariloche, Rio Negro - Argentina

^[3] Univ Fed ABC UFABC, Ctr Nat & Human Sci CCNH, BR-09210580 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: ACS APPLIED NANO MATERIALS; v. 2, n. 11, p. 6889-6897, NOV 2019.
• Web of Science Citations: 0

Abstract

Photothermal effects in plasmonic nanoparticles can be used to locally modify temperature-sensitive materials. Polylactic acid (PLA) is a thermoplastic biodegradable polymer with a glass transition temperature around 60 degrees C that has been popularized as a feedstock material for 3D printing. Here, we extend its use to produce thin PLA films that can be modified at the microscopic level when covered with gold nanostars (AuNSs). The heat dissipation generated when exciting the plasmon resonance of AuNSs, under exposure to 976 nm focused laser light, produces an increase in the local temperature of more than 100 degrees C. When the temperature surpasses the glass transition of the base PLA layer, AuNSs get attached to the polymer surface. The following dissolution of the unexposed material in acetone bath permits the precise control of the engraving process at the microscale. Furthermore, Er3+ doped upconverting nanoparticles embedded into the PLA layer can act as optical nanothermometers to probe the local temperature, simultaneously allowing the visualization of the laser spot. A computer numerical control (CNC) system was developed to drive the laser writing beam and transfer 2D patterns, opening up the thermoplasmonic maskless lithography technique. Suitable for rigid and flexible substrates coated with PLA, the methods and materials developed here were applied to produce patterned substrates for surface enhanced Raman spectroscopy and luminescent optical encoding for anticounterfeiting technologies. (AU)

• FAPESP's process: 15/23882-4 - PLASMONIC EFICIENCY INTENSIFICATION OF THE UPCONVESION IN NANOCRYSTAIS DOPED WITH RARE EARTHS.
• Grantee: Eduardo David Martínez
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/21290-2 - Multi-User Equipment in grant 12/04870-7 - dynamic light scattering analyser Horiba SZ-100Z
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 12/05903-6 - Nuclear magnetic resonance of novel complex and advanced materials in condensed matter physics
• Grantee: Ricardo Rodrigues Urbano
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 12/04870-7 - Studies of novel complex and advanced materials
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/21289-4 - Multi-User Equipment in grant 12/04870-7 - desktop X-ray powder diffractometer
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Special Projects
• FAPESP's process: 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach
• Grantee: Carlos Rettori
• Support Opportunities: Research Projects - Thematic Grants