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Inada N, Asakawa H, Kobayashi T, et al. Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer. Beilstein J Nanotechnol. 2016;7:409-17doi: 10.3762/bjnano.7.36.
Inada, N., Asakawa, H., Kobayashi, T., & Fukuma, T. (2016). Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer. Beilstein journal of nanotechnology, 7409-17. https://doi.org/10.3762/bjnano.7.36
Inada, Natsumi, et al. "Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer." Beilstein journal of nanotechnology vol. 7 (2016): 409-17. doi: https://doi.org/10.3762/bjnano.7.36
Inada N, Asakawa H, Kobayashi T, Fukuma T. Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer. Beilstein J Nanotechnol. 2016 Mar 10;7:409-17. doi: 10.3762/bjnano.7.36. eCollection 2016. PMID: 27335733; PMCID: PMC4901543.
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Beilstein J Nanotechnol. 2016 Mar 10;7:409-17. doi: 10.3762/bjnano.7.36. eCollection 2016.

Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer.

Beilstein journal of nanotechnology

Natsumi Inada, Hitoshi Asakawa, Taiki Kobayashi, Takeshi Fukuma

Affiliations

  1. Division of Electrical Engineering and Computer Science, Kanazawa University, Kanazawa, Japan.
  2. Division of Electrical Engineering and Computer Science, Kanazawa University, Kanazawa, Japan; Bio-AFM Frontier Research Center, Kanazawa University, Kanazawa, Japan; PRESTO, JST, Kawaguchi, Japan.
  3. Division of Electrical Engineering and Computer Science, Kanazawa University, Kanazawa, Japan; Bio-AFM Frontier Research Center, Kanazawa University, Kanazawa, Japan; ACT-C, JST, Kawaguchi, Japan.

PMID: 27335733 PMCID: PMC4901543 DOI: 10.3762/bjnano.7.36

Abstract

Photothermal excitation is a cantilever excitation method that enables stable and accurate operation for dynamic-mode AFM measurements. However, the low excitation efficiency of the method has often limited its application in practical studies. In this study, we propose a method for improving the photothermal excitation efficiency by coating cantilever backside surface near its fixed end with colloidal graphite as a photothermal conversion (PTC) layer. The excitation efficiency for a standard cantilever of PPP-NCHAuD with a spring constant of ≈40 N/m and a relatively stiff cantilever of AC55 with a spring constant of ≈140 N/m were improved by 6.1 times and 2.5 times, respectively, by coating with a PTC layer. We experimentally demonstrate high stability of the PTC layer in liquid by AFM imaging of a mica surface with atomic resolution in phosphate buffer saline solution for more than 2 h without any indication of possible contamination from the coating. The proposed method, using a PTC layer made of colloidal graphite, greatly enhances photothermal excitation efficiency even for a relatively stiff cantilever in liquid.

Keywords: atomic force microscopy; cantilever excitation; dynamic mode; photothermal conversion; photothermal excitation

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