Self‐Powered Sweat‐Responsive Structural Color Display

Kim, Taebin; Park, Tae Hyun; Lee, Jae Won; Lee, Dongwook; Mun, Seungsoo; Kim, Gwangmook; Kim, Yeonji; Kim, Gwanho; Park, Jong Woong; Lee, Kyuho; Lee, Seung Won; Jeon, Seungbae; Ryu, Du Yeol; Shim, Wooyoung; Kim, Jayoung; Park, Cheolmin

doi:10.1002/adfm.202314721

Cited by 4 publications

(1 citation statement)

References 90 publications

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“…1DPCs based on block copolymer (BCP PCs) have provided a strategy for achieving self-standing structural color films. − Based on the integrated preparation procedure and annealing process, the strong strength and toughness make BCP PCs easy to transfer or peel off to assemble devices. However, for most 1DPCs prepared by top–down assembly methods, the weak interaction force between layers and the film stable bonding to the substrate make the process of peeling off become a challenge.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Programmable Ultrathin Flexible and Brilliant-Colored 1D Photonic Crystal Films for Photonic Pigments and Sensing

Shi,

Ge,

Kou

et al. 2024

ACS Appl. Polym. Mater.

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1D photonic crystals (1DPCs) with bright structural colors are important in a variety of applications, such as sensing, bioimaging, and smart displays. However, the lack of methodologies to produce self-standing 1DPCs remains a challenge for their practical application. Here, we report a method for fabricating ultrathin flexible and brilliantly colored 1DPC films based on the temperature-programmable film-forming property of polymer nanoparticles. Nano poly(styrene-acrylic acid) (P(St-AA)) and TiO 2 are used for 1DPC assembly to achieve high reflectivity and brilliancy. Based on the change of heating temperature and the microbubbles produced during dissolving of the SiO 2 sacrificial layer, the size of the self-standing PCs can be facilely regulated, and the layer-by-layer microstructure remains unchanged. When heated at 85 °C, 1DPC fragments with various brilliant colors are prepared, and they can maintain brilliant structural color for more than one year, which is the first report using 1DPCs as photonic pigments. When heated at 200 °C, the whole 1DPC film can be released from the substrate and retains its mechanical integrity. With this designed method, an ultrathin dry self-standing 1DPC film with a thickness of only 557 nm is first obtained. The self-standing 1DPC films can be patterned easily and transferred to any surfaces such as curved glass bottles and flexible textile fabrics. Moreover, this method will not affect the response of PCs to benzene vapor, which provides a platform for a wearable sensor.

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Section: Introductionmentioning

confidence: 99%

Temperature-Programmable Ultrathin Flexible and Brilliant-Colored 1D Photonic Crystal Films for Photonic Pigments and Sensing

Shi,

Ge,

Kou

et al. 2024

ACS Appl. Polym. Mater.

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From Lab to Life: Self‐Powered Sweat Sensors and Their Future in Personal Health Monitoring

Gao,

Xu,

Chang

et al. 2024

Advanced Science

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The rapid development of wearable sweat sensors has demonstrated their potential for continuous, non‐invasive disease diagnosis and health monitoring. Emerging energy harvesters capable of converting various environmental energy sources—biomechanical, thermal, biochemical, and solar—into electrical energy are revolutionizing power solutions for wearable devices. Based on self‐powered technology, the integration of the energy harvesters with wearable sweat sensors can drive the device for biosensing, signal processing, and data transmission. As a result, self‐powered sweat sensors are able to operate continuously without external power or charging, greatly facilitating the development of wearable electronics and personalized healthcare. This review focuses on the recent advances in self‐powered sweat sensors for personalized healthcare, covering sweat sensors, energy harvesters, energy management, and applications. The review begins with the foundations of wearable sweat sensors, providing an overview of their detection methods, materials, and wearable devices. Then, the working mechanism, structure, and a characteristic of different types of energy harvesters are discussed. The features and challenges of different energy harvesters in energy supply and energy management of sweat sensors are emphasized. The review concludes with a look at the future prospects of self‐powered sweat sensors, outlining the trajectory of the field and its potential to flourish.

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Flexible Inverse Opal Structural Color Films with High Strength and Harsh Environment Stability

Wang,

Zhang,

Zhao

et al. 2024

ACS Appl. Mater. Interfaces

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Flexible photonic crystals (PCs) constructed by PCs and special polymers are very promising to achieve a combination of vivid structural colors, mechanical robustness, and environment stability. However, PCs that incorporate polymer binders are still susceptible to destruction and subsequent loss of structural color when subjected to significant external forces or harsh environments. Besides, because most of these polymers are highly flammable, crucial fire safety is difficult to be guaranteed in the application of these materials. In this study, we report a poly(m-phenyleneisophthalamide) inverse opal (PMIA IO) structural color film through a SiO 2 PC template sacrificing method. Benefiting from the high rigid PMIA molecular structural configuration, the PMIA IO films are able to maintain their structural colors even in harsh conditions, such as large tensile stress, high and low temperatures, potent acids and bases, and ultraviolet radiation. More attractively, the PMIA IO films demonstrate excellent flame retardancy, with the limiting oxygen index (LOI) and flame retardant rating reaching 28 vol % and V0, respectively. We believe that the flexible structural color films with high strength, harsh environment stability, and flame retardancy, which are difficult for other structural color materials to possess simultaneously, have great potential for special applications in fire protection, national defense, aviation, marine, and aerospace fields.

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Self‐Powered Sweat‐Responsive Structural Color Display

Cited by 4 publications

References 90 publications

Temperature-Programmable Ultrathin Flexible and Brilliant-Colored 1D Photonic Crystal Films for Photonic Pigments and Sensing

Temperature-Programmable Ultrathin Flexible and Brilliant-Colored 1D Photonic Crystal Films for Photonic Pigments and Sensing

From Lab to Life: Self‐Powered Sweat Sensors and Their Future in Personal Health Monitoring

Flexible Inverse Opal Structural Color Films with High Strength and Harsh Environment Stability

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