Quantitative Analysis of Structure Color of Photonic Crystal Sensors Based on HSB Color Space

Abstract

The photonic crystals (PhCs) have a bright structural color, but their angular dependence and naked-eye observation subjectivity only apply for qualitative analysis. The HSB color space is a three-channel color analysis technology based on hue (H)–saturation (S)–brightness (B). We use the HSB color space to analyze the structural color of the AM/NIPAM PhCs hydrogel sensor in response to temperature and organic solvents. We proved that the structural color analysis based on the hue value (H) could achieve an analysis accuracy close to the spectrum analysis. In addition, we have obtained stimulus-responsive PhCs structure color images from references and quantitatively analyzed them through the HSB color space. The results show that the H of the structural color can establish a high correlation with the specified target. In some cases, its best fitness exceeds traditional spectroscopy methods. This analysis method will provide a general and quantitative analysis technology for the structural color of PhCs by consumer-grade computers and smartphones.

A cysteamine-functionalized biomimetic chromotropic hydrogel for naked-eye detection and adsorption of mercury ions

“…Furthermore, we extract the corresponding HSB values from the optical photos of Cys-BCH with different Hg 2+ concentrations, which represent the values of the three channels of hue (H), saturation (S), and brightness (B). 44 As shown in Fig. 6e, with the increase of Hg 2+ concentration, the S and B values related to the intensity of the ambient light source are stable at around 90.…”

Opal photonic crystal double‐network hydrogel for visual detection through structural color and fluorescent responsiveness

“…Photonic crystal materials have attracted widely attention owing to brilliant structural color through Bragg diffraction. 1,2 Especially, stimuli-responsive hydrogels (e.g., photonic crystal hydrogels [3][4][5] and fluorescent hydrogels [6][7][8] ) are widely used in the field of visual detection, such as sensors for glucose, 9 organic solvents and compounds, [10][11][12] metal ions. [13][14][15] Photonic crystal hydrogels combine the unique structural colors of photonic crystals with the stimuli-responsiveness of hydrogels, because hydrogels can memorize or immobilize the periodic structure of photonic crystals.…”

Molecular imprinting of cellulose cotton fabric/silica materials with a colorimetric dithizone chelation for smartphone‐based detection of Zn (II) ions in water samples

“…HSL, which stands for hue, saturation and lightness, and HSV, which stands for hue, saturation and value, are abbreviated versions of the HSB colour model. In this work, the saturation parameter of HSV was measured to define the grey percentage ranging from 0% to 100%, indicating the saturation in the order of highest to lowest 44–46 . The saturation channel can provide more reproducible colour intensity compared with the RGB colour channels when the digital image is taken by smartphone under illumination variation between different regions of the cotton materials.…”