Colorimetric and plasmonic pressure sensors based on polyacrylamide/Au nanoparticles

Non-enzymatic colorimetric glucose detection based on Au/Ag nanoparticles using smartphone and machine learning

“…Synthesis of Au NPs: The colloidal dispersions of different-sized Au NPs were prepared by the reduction of HAuCl4 with NaBH4 using Na3C6H5O7 as a stabilizer at ambient temperature 35 and the traditional Turkevich method 54 using PVP as a stabilizer. 55 In the former method, aqueous solutions of HAuCl4 (10 mM, 0.5 mL) and Na3C6H5O7 (10 mM, 0.5 mL) were mixed and completed to a total volume of 20 mL. Then freshly prepared NaBH4 (1.0 mM, 0.5 mL) was added into the solution under magnetic stirring at ambient temperature.…”

Large‐Area Virus Coated Ultrathin Colorimetric Sensors with a Highly Lossy Resonant Promoter for Enhanced Chromaticity

“…[6][7][8] By recent developments in photonic structures, some structural colors can be reversibly changed in response to external stimuli. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Based on a lesson from natural photonic structure, specific examples of photonic crystal-based structural coloring schemes show unprecedented possibilities in colorimetric sensor applications, such as temperature, pH, ion species, solvents, water vapor, humidity, pressure, and biomolecule detection. [13][14][15][16][17][18][19][20][21][22][23][24] Since a combination of introduced design methods for colorimetric detection, inspired by photonic structures, depends on highly ordered structures and periodically arranged refractive indices, concomitant co-assembling of multiple materials and micro/nano building blocks to achieve uniform colors at a large scale constrains their rapid/convenient fabrication.…”

“…[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Based on a lesson from natural photonic structure, specific examples of photonic crystal-based structural coloring schemes show unprecedented possibilities in colorimetric sensor applications, such as temperature, pH, ion species, solvents, water vapor, humidity, pressure, and biomolecule detection. [13][14][15][16][17][18][19][20][21][22][23][24] Since a combination of introduced design methods for colorimetric detection, inspired by photonic structures, depends on highly ordered structures and periodically arranged refractive indices, concomitant co-assembling of multiple materials and micro/nano building blocks to achieve uniform colors at a large scale constrains their rapid/convenient fabrication. [17][18][19][20] Meanwhile, recent approaches utilizing a combination of simple photonic structures with materials that are dynamically responsive to external stimuli, such as proteins and hydrogels, have been successfully demonstrated.…”

Ultrahigh Sensitivity of a Plasmonic Pressure Sensor with a Compact Size

“…SPPs based on metalinsulator-metal (MIM) bus waveguide (WG) combined with single or several nanocavities (or resonators) has a myriad of considerations due to its unique optical properties, including low losses, long propagation distance, easy fabrication, and compatible integrated optical circuits (IOCs) [16][17][18][19][20]. Plasmonic MIM WGs combined with resonators have many applications in nanophotonics fields [21][22][23], such as optical switches [24], beam splitters [25,26], perfect absorbers [27][28][29], optical filters [30][31][32], and plasmonic sensor [33][34][35] because of their robust light localization and confinement and light tunability at a subwavelength regime and excellent performance of sensitivity to the variation of ambient materials.…”