28 August 2014 Photothermal nanopositioners based on graphene nanocomposites
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By dispersing graphene nanoplatelets (GNPs) within a polydimethylsiloxane matrix, we show that light absorption by GNPs and subsequent energy transduction to the polymeric chains can be used to controllably produce significant amounts of motion through entropic elasticity of the pre-strained composite. Using dual actuators, a twoaxis sub-micron resolution stage was developed, and allowed for two-axis photo-thermal positioning (~100 μm per axis) with 120 nm resolution (feedback sensor limitation), and ~5 μm s-1 actuation speeds. A PID control loop automatically stabilizes the stage against thermal drift, as well as random thermal-induced position fluctuations (up to the bandwidth of the feedback and position sensor).
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James Loomis, James Loomis, Balaji Panchapakesan, Balaji Panchapakesan, "Photothermal nanopositioners based on graphene nanocomposites", Proc. SPIE 9170, Nanoengineering: Fabrication, Properties, Optics, and Devices XI, 91700B (28 August 2014); doi: 10.1117/12.2061071; https://doi.org/10.1117/12.2061071

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