Self-adhesive graphene oxide-wrapped TiO2 nanoparticles for UV-activated colorimetric oxygen detection

Son, Eun Jin; Lee, Joon Seok; Lee, Min-Ah; Vu, Chau Hai Thai; Lee, Hana; Won, Keehoon; Park, Chan Beum

doi:10.1016/j.snb.2015.02.084

Cited by 22 publications

(14 citation statements)

References 33 publications

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“…The ΔE values after 2 h are shown in Figure 3. The rate of the color change was proportional to the oxygen concentration, as observed with other oxygen indicators, 16,45 because oxygen is also a substrate of the chromogenic reaction catalyzed by laccase (Scheme 1c). Because ΔE values above 2 (represented by the dashed line in Figure 3) indicate color differences that are noticeable to an untrained eye, even the presence of 1% oxygen in the package can be detected easily within 2 h using the novel oxygen indicator.…”

Section: ■ Results and Discussionsupporting

confidence: 57%

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

Won

Jang

Jeon

2016

J. Agric. Food Chem.

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Intelligent food packaging can provide consumers with reliable and correct information on the quality and safety of packaged foods. One of the key constituents in intelligent packaging is a colorimetric oxygen indicator, which is widely used to detect oxygen gas involved in food spoilage by means of a color change. Traditional oxygen indicators consisting of redox dyes and strong reducing agents have two major problems: they must be manufactured and stored under anaerobic conditions because air depletes the reductant, and their components are synthetic and toxic. To address both of these serious problems, we have developed a natural component-based oxygen indicator characterized by in-pack activation. The conventional oxygen indicator composed of synthetic and artificial components was redesigned using naturally occurring compounds (laccase, guaiacol, and cysteine). These natural components were physically separated into two compartments by a fragile barrier. Only when the barrier was broken were all of the components mixed and the function as an oxygen indicator was begun (i.e., in-pack activation). Depending on the component concentrations, the natural component-based oxygen indicator exhibited different response times and color differences. The rate of the color change was proportional to the oxygen concentration. This novel colorimetric oxygen indicator will contribute greatly to intelligent packaging for healthier and safer foods.

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Section: ■ Results and Discussionsupporting

confidence: 57%

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

Won

Jang

Jeon

2016

J. Agric. Food Chem.

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“…Clearly the oxygen is the key in the recoloration process, which has been reported by many groups. 8,10,13,14,17,35,36 There is nearly no decrease in twenty minutes under visible light and no photobleaching of MB, as shown in Fig. 4C, using the pure P25 nanoparticles as a control.…”

Section: Resultsmentioning

confidence: 76%

Large-scale synthesis of carbon dots/TiO₂ nanocomposites for the photocatalytic color switching system

et al. 2019

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“…GR also served as a scaffold for the synthesis of functional hybrid materials through van der Waals forces or π−π stacking interactions. 11,20 Compared with GR, graphene oxide (GO), which could be regarded as GR functionalized by epoxide, hydroxyl, or carboxylic acid groups, is more noteworthy due to its tunable chemical, conductive, and optical properties, 21,22 as well as higher photoinduced electron/energy-transfer efficiency than GR. 3,23−27 In addition to the van der Waals forces and π−π stacking interactions, various oxygen-rich functional groups of GO allow assembling of other active cationic components through additional robust electrostatic interactions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…This is also one of the most fascinating aspects of natural photosynthesis. , GR not only has remarkable electronic and optical properties to improve electron transfer but also has notable physical features, such as a two-dimensional monolayer structure and a large specific surface area. GR also served as a scaffold for the synthesis of functional hybrid materials through van der Waals forces or π–π stacking interactions. , …”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide and Polyelectrolyte Composed One-Way Expressway for Guiding Electron Transfer of Integrated Artificial Photosynthesis

Kang

et al. 2018

ACS Sustainable Chem. Eng.

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A novel photocatalyst/biocatalyst integrated artificial photosynthesis system (APS) based on polyurethane hollow nanofibers doped with graphene oxide (GO) and poly(allylamine hydrochloride) (PAH) was developed and employed for selective methanol conversion from CO 2 . The biocatalysts, including formate, formaldehyde, and alcohol dehydrogenases, as well as NAD + , were in situ coencapsulated inside the lumen of the GO-PAH-doped PU nanofibers (G-Fiber) by simply predissolving them in the core-phase solution for coaxial electrospinning, while the precise assembling of the photocatalyst parts involving visible light active photosensitizer (PS) and electron mediator (M) on the surface of the G-Fiber was realized by their π−π interactions with the GO doped in the shell of fibers. By using this highly integrated APS, about 10-times higher methanol yield was accomplished as compared with the solution-based system. The significantly enhanced reaction efficiency of the G-Fiber-based APS is considered predominately due to the electron transfer "one-way expressway" composed of the doped polyelectrolyte and GO in the G-Fiber; therefore, the electron-transfer distance along the PS-M-NAD + electron transport chain could be shortened and the speed could be accelerated. As a consequence, the electron back-flow between PS and M, as well as the recombination of the excited electron and the hole of PS were eliminated. The current work will represent a new benchmark for solar-energy driven conversion of CO 2 to a wide range of fuels and chemicals in an environmentally benign manner.

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Self-adhesive graphene oxide-wrapped TiO2 nanoparticles for UV-activated colorimetric oxygen detection

Cited by 22 publications

References 33 publications

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

Large-scale synthesis of carbon dots/TiO₂ nanocomposites for the photocatalytic color switching system

Graphene Oxide and Polyelectrolyte Composed One-Way Expressway for Guiding Electron Transfer of Integrated Artificial Photosynthesis

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Self-adhesive graphene oxide-wrapped TiO2 nanoparticles for UV-activated colorimetric oxygen detection

Cited by 22 publications

References 33 publications

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

A Natural Component-Based Oxygen Indicator with In-Pack Activation for Intelligent Food Packaging

Large-scale synthesis of carbon dots/TiO2 nanocomposites for the photocatalytic color switching system

Graphene Oxide and Polyelectrolyte Composed One-Way Expressway for Guiding Electron Transfer of Integrated Artificial Photosynthesis

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Product

Resources

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Large-scale synthesis of carbon dots/TiO₂ nanocomposites for the photocatalytic color switching system