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. 2018 May 31;3(5):5244-5251.
doi: 10.1021/acsomega.8b00639. Epub 2018 May 15.

Photothermal Cellulose-Patch with Gold-Spiked Silica Microrods Based on Escherichia coli

Soomin Han  1 , Kyoungho Han  1 , Jaehwan Hong  1 , Do-Young Yoon  1 , Chulhwan Park  1 , Younghun Kim  1
Affiliations

Photothermal Cellulose-Patch with Gold-Spiked Silica Microrods Based on Escherichia coli

Soomin Han et al. ACS Omega. .

Abstract

Plasmonic-mediated photothermal heating under near-infrared (NIR) irradiation is an emerging key technology in the field of photothermal therapy and chemical reactions. However, there are few reports of photothermal film (dry-type patch), and thus, in this work, we developed the plasmonic-induced photothermal cellulose-patch operating in the NIR region. Hollow and spikelike gold nanostructures, gold-spikes, as plasmonic nanoparticles were prepared and decorated on silica microrods, which were prepared based on a unicellular organism, Escherichia coli, as a framework. In addition, freestanding cellulose-patch was prepared by mixing filter-paper pulp and armored golden E. coli (AGE) microrods. The major absorbing peak of AGE solution was revealed to be 873 nm, and the surface temperature of patch was increased to 264 °C within a very short time (1 min). When NIR laser was irradiated on the patch dipped in the water, the formation of water vapor and air bubbles was observed. The heating efficiency of indirect heat transfer via conduction from patch-to-water was 35.0%, while that of direct heat transfer via radiation from patch in water was 86.1%. Therefore, the cellulose-patch containing AGE microrods has possible applicability to desalination and sterilization because of its fast heating rate and high light-to-heat conversion under the irradiation of low-powered IR laser.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Scheme of (a) gold-spikes decorated silica microrods prepared using the E. coli template and (b) assembly of cellulose-patch of AGE microrods and cellulose-paper pulp.
Figure 2
Figure 2
Representative TEM images of (a) E. coli coated with the silica layer, (b) AuNS particles, and (c) AGE microrods, and (d) UV–vis spectra of the AuNS and AGE microrods.
Figure 3
Figure 3
SEM images of (a) E. coli coated with silica layer, and (b) silica microrods decorated with AuNS in cellulose-patch. Pictures of the cellulose-patch containing 100 mg/L of (c) AuNS and (d) AGE and (e) 600 mg/L of AGE.
Figure 4
Figure 4
Temperature profiles of (a) surface of patch (Tpatch) and (b) inner water (Twater) heated by the plasmonic-mediated photothermal effect with different patch types (conditions: 100 mg/L of AGE microrods on the patch, under 808 nm irradiation of 2 W/cm2).
Figure 5
Figure 5
Pictures of the generation test of water vapor and air bubble in (a) adiabatic and (b) nonadiabatic conditions (cellulose-patch with 100 mg/L of AGE, 4 W/cm2 irradiation).
Figure 6
Figure 6
Temperature monitoring of (a) the surface of cellulose-patch with 100 mg/L of AGE and (b) inner water over four cycles of 808 nm laser irradiation on/off (2 W/cm2).
See this image and copyright information in PMC

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