SCIENCE CHINA Information Sciences, Volume 64 , Issue 12 : 222401(2021) https://doi.org/10.1007/s11432-020-3141-3

Flexible plasmonic random laser for wearable humidity sensing

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  • ReceivedOct 28, 2020
  • AcceptedDec 16, 2020
  • PublishedSep 28, 2021



This work was supported by National Natural Science Foundation of China (Grant Nos. 61822501, 12004017) and Beijing Natural Science Foundation (Grant Nos. Z180015, 1204028).


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  • Figure 1

    (Color online) Schematic illustration of the fabrication process of the PRLHS.

  • Figure 2

    (Color online) (a) Cross section SEM image of the PE/PEDOT:PSS composite film. Inset: PEDOT:PSS layer at high magnification, scalar bar: 2 $\mu$m. (b) Top-view SEM image of the PRLHS. The orange circles indicate the Ag NPs. (c) Photograph of the PRLHS. (d) SEM image of Ag NPs. (e) Extinction spectrum of Ag NPs, PL spectra of PRLHS with/without Ag NPs. The violet dash line denotes the wavelength of the pump source (400 nm, 200 fs, 1 kHz).

  • Figure 3

    (Color online) Random lasing actions in the random laser-based humidity sensor at original RH (34.8%). (a) Emission spectra at different pump energy densities. (b) Emission intensity (black spheres) and the linewidth (blue spheres) as a function of the pump energy density.

  • Figure 4

    (Color online) (a) The emission spectra of the PRLHS at different humidifies under the pump energy density of 15.1 $\mu$J/cm$^2$ ($n_{\rm~PEDOT:PSS}$ = 1.49). (b) Peak intensities of emission spectra in PRLHS and reference substance with/without PEDOT:PSS layer vary with the RH values. The spheres are the experimental data, and the dashed line is the corresponding linearly fitted curve. (c) Electric field distributions at the interface of PFO layer and air layer. Inset: the electric field distribution of the corresponding PE/PEDOT:PSS/PFO structure at 448 nm. (d) The electric field intensity ($E^2_{\text~{PFO-Air}}$) at the interface of PFO layer and air layer varies with the refractive index of PEDOT:PSS layer ($n_{\rm~PEDOT:PSS}=1.35-1.49$).

  • Figure 5

    (Color online) The repeatability of PRLHS after several wetting and drying cycles. (a) Reversibility of the sample between RH 67.5% and 76.2% ($P$ = 101.3 KPa, $T$ = 23$^\circ$C). Inset: Images of the sample before ①and after ②wetting and drying cycles. (b) Peak intensities of emission spectra in the sample as a function of RH values. The blue dots denote the experimental data. The blue dashed line corresponds to its linear relationship. Inset: The time response of the sample at three RH values for calculating the $\sigma_{\rm~D}$ in the experiment.

  • Figure 6

    (Color online) The flexibility and wearability of the proposed PRLHS. Water content sensor attached on (a) the wrinkle apple slice and (b) fresh apple slice. (c) The corresponding emission spectra of PRLHS on wrinkle/fresh apple slices. (d) PRLHS attached on the mask. (e) The wearable showing. (f) The emission spectra of PRLHS before/after water spraying on the mask. In our experiment, the exciting light is perpendicular to the surface of the sample. The intensity of the laser beam is controlled by a variable optical attenuator. The reflected light is collected by the spectrometer. The detector is fixed at an angle of about 45$^\circ$ to the sample surface.


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