研究目的
To develop a real-time naked-eye recognizable temperature monitoring system based on Ho3+ (or Tm3+)-activated NaYF4 upconversion nanowires via visual multicolor alteration, overcoming the limitations of conventional thermometers that require expensive equipment and data processing.
研究成果
The study successfully demonstrated a novel thermometry technique using upconversion nanowires for real-time, naked-eye recognizable temperature monitoring via visual multicolor alteration. The method is simple, cost-effective, and has applications in temperature sensing, anti-counterfeiting, and multicolor probing, with good thermal stability and repeatability.
研究不足
The technique is limited to temperature ranges up to 295°C and may require optimization for higher temperatures or different environments. The synthesis process involves specific conditions that might not be easily scalable, and the reliance on laser excitation could pose practical challenges in some applications.
1：Experimental Design and Method Selection:
The study synthesized hexagonal-phase NaYF4:Yb3+,Ho3+,Tm3+ upconversion nanowires with different rare-earth doping proportions using a hydrothermal method. The design rationale was to exploit the temperature-dependent spectral sensitivities of upconversion emissions for visual color change.
2：Sample Selection and Data Sources:
Samples were prepared with specific RE doping ratios (e.g., Y/Yb/Ho/Tm = 79:20:
3：
4：7) and synthesized at 180°C or 200°C for 24 hours. Data were collected from UCL spectra under 975 nm laser excitation. List of Experimental Equipment and Materials:
Equipment included a stainless-steel autoclave for synthesis, SEM and TEM for imaging, HRTEM and SAED for structural analysis, EDS for elemental mapping, and a 975 nm laser for excitation. Materials included RE nitrates, citric acid, sodium dodecyl sulfonate, NaF, and ethanol.
5：Experimental Procedures and Operational Workflow:
The synthesis involved mixing RE nitrates with citric acid, adding sodium dodecyl sulfonate and NaF, heating in an autoclave, washing with ethanol, and dispersing in ethanol. UCL spectra were measured at varying temperatures, and chromaticity coordinates were analyzed.
6：Data Analysis Methods:
UCL intensities were normalized and analyzed using the CIE 1931 color space and chromaticity shift equations. Statistical analysis involved comparing integrated intensities and color changes.
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