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Thermochemical nanolithography (TCNL) or thermochemical scanning probe lithography (tc-SPL) is a scanning probe microscopy-based nanolithography technique which triggers thermally activated chemical reactions to change the chemical functionality or the phase of surfaces. Chemical changes can be written very quickly through rapid probe scanning, since no mass is transferred from the tip to the surface, and writing speed is limited only by the heat transfer rate. TCNL has demonstrated to produce local chemical changes with feature sizes down to 12 nm at scan speeds up to 1 mm/s.
In 2013, a group at the Georgia Institute of Technology used TCNL to create a nano-scale replica of the Mona Lisa "painted" with different probe tip temperatures. Called the Mini Lisa, the portrait measured 30 micrometres (0.0012 in), about 1/25,000th the size of the original.
The AFM thermal cantilevers are generally made from a silicon wafers using traditional bulk and surface micro-machining processes. Through the application of an electrical current through its highly doped silicon wings, resistive heating occurs at the light doping zone around the probe tip, where the largest fraction of the heat is dissipated. The tip is able to change its temperature very quickly due to its small volume; an average tip in contact with polycarbonate has a time constant of 0.35 ms. The tips can be cycled between ambient temperature and 1100 °C at up to 10 MHz while the distance of the tip from the surface and the tip temperature can be controlled independently.
Thermally activated reactions have been triggered in proteins, organic semiconductors, electroluminescent conjugated polymers, and nanoribbon resistors. Deprotection of functional groups (sometimes involving a temperature gradients), and the reduction of graphene oxide has been demonstrated. The wettability of a polymer surface at the nanoscale has been modified, and nanostructures of poly(p-phenylene vinylene) (a electroluminescence conjugated polymer) have been created. Nanoscale templates on polymer films for the assembly of nano-objects such as proteins and DNA have also been created and crystallization of ferroelectric ceramics with storage densities up to 213 Gb/in2 have been produced.
The use of a material that can undergo multiple chemical reactions at significantly different temperatures could lead to a multi-state system, wherein different functionalities can be addressed at different temperatures.
Comparison with other lithographic techniques
Thermo-mechanical scanning probe lithography relies on the application of heat and force order to create indentations for patterning purposes (see also: Millipede memory). Thermal scanning probe lithography (t-SPL) specializes on removing material from a substrate without the intent of chemically altering the created topography. Local oxidation nanolithography relies on oxidation reactions in a water meniscus around the probe tip.
- Scanning probe lithography
- Local oxidation nanolithography
- Dip-pen nanolithography
- Atomic force microscopy
- Scanning probe microscopy
- Eoin O'Carroll (August 7, 2013). "'Mini Lisa': Georgia Tech researchers create world's tiniest da Vinci reproduction". Christian Science Monitor. Retrieved August 8, 2013.
- Carroll, A.K. G.; Wang, D.; Kodali, V.; Scrimgeour, J.; King, W.; Marder, S.; Riedo, E.;Curtis, J., Fabricating Nanoscale Chemical Gradients with ThermoChemicalNanoLithography, Langmuir, 29 (2013) 8675–8682.
- "Large-scale Nanopatterning of Single Proteins used as Carriers of Magnetic Nanoparticles - Martínez - 2009 - Advanced Materials - Wiley Online Library". doi.wiley.com. Retrieved 2015-05-07.
- Fenwick, Oliver; Bozec, Laurent; Credgington, Dan; Hammiche, Azzedine; Lazzerini, Giovanni Mattia; Silberberg, Yaron R.; Cacialli, Franco (October 2009). "Thermochemical nanopatterning of organic semiconductors". Nature Nanotechnology 4 (10): 664–668. doi:10.1038/nnano.2009.254. ISSN 1748-3387. Retrieved 2015-05-06.
- "On-Demand Patterning of Nanostructured Pentacene Transistors by Scanning Thermal Lithography - Shaw - 2012 - Advanced Materials - Wiley Online Library". doi.wiley.com. Retrieved 2015-05-07.
- "Thermochemical Nanolithography of Multifunctional Nanotemplates for Assembling Nano-Objects - Wang - 2009 - Advanced Functional Materials - Wiley Online Library". doi.wiley.com. Retrieved 2015-05-06.
- Carroll, Keith M.; Giordano, Anthony J.; Wang, Debin; Kodali, Vamsi K.; Scrimgeour, Jan; King, William P.; Marder, Seth R.; Riedo, Elisa; Curtis, Jennifer E. (July 9, 2013). "Fabricating Nanoscale Chemical Gradients with ThermoChemical NanoLithography". Langmuir 29 (27): 8675–8682. doi:10.1021/la400996w. ISSN 0743-7463. Retrieved 2015-05-06.
- Wei, Zhongqing; Wang, Debin; Kim, Suenne; Kim, Soo-Young; Hu, Yike; Yakes, Michael K.; Laracuente, Arnaldo R.; Dai, Zhenting; Marder, Seth R. (06/11/2010). "Nanoscale Tunable Reduction of Graphene Oxide for Graphene Electronics". Science 328 (5984): 1373–1376. doi:10.1126/science.1188119. ISSN 0036-8075. PMID 20538944. Retrieved 2015-05-06. Check date values in:
- R. Szoszkiewicz, T. Okada, S. C. Jones, T.-D. Li, W. P. King, S. R. Marder, and E. Riedo (2007). "High-Speed, Sub-15nm Feature Size Thermochemical Nanolithography". Nano Lett. 7: 1064–1069. doi:10.1021/nl070300f.
- D. Wang, T. Okada, R. Szoszkiewicz, S. C. Jones, M. Lucas, J. Lee, W. P. King, S. R. Marder, E. Riedo (2007). "Local wettability modification by thermochemical nanolithography with write-read-overwrite capability". Appl. Phys. Lett. 91: 243104. doi:10.1063/1.2816401.
- Wang, Debin; Kim, Suenne; Ii, William D. Underwood; Giordano, Anthony J.; Henderson, Clifford L.; Dai, Zhenting; King, William P.; Marder, Seth R.; Riedo, Elisa (2009-12-07). "Direct writing and characterization of poly(p-phenylene vinylene) nanostructures". Applied Physics Letters 95 (23): 233108. doi:10.1063/1.3271178. ISSN 0003-6951. Retrieved 2015-05-06.
- D. Wang et al. (2009). "Thermochemical Nanolithography of Multifunctional Nanotemplates for Assembling Nano-Objects". Adv. Funct. Mat. 19: 3696–3702. doi:10.1002/adfm.200901057.
- "Direct Fabrication of Arbitrary-Shaped Ferroelectric Nanostructures on Plastic, Glass, and Silicon Substrates - Kim - 2011 - Advanced Materials - Wiley Online Library". doi.wiley.com. Retrieved 2015-05-07.