Simple inkjet-printed, UV-activated oxygen indicator

Lawrie, Katherine; Mills, Andrew; Hazafy, David

doi:10.1016/j.snb.2012.10.125

Cited by 56 publications

(37 citation statements)

References 23 publications

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“…6B shows the initial recovery rate of the MB/GO-TiO 2 /glycerol/HEC film as a function of oxygen concentration. The recovery rate was proportional to the oxygen level in the gas phase as reported in the literature [6,9,26,27,32]. The direct relationship between the rate and oxygen concentration is not unexpected recalling the dark color recovery is a reaction of LMB with oxygen (2LMB + O 2 → 2MB + + 2OH − ).…”

Section: Colorimetric Oxygen Detection With Mb/go-tio 2 -Based Filmsupporting

confidence: 72%

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

Son

Lee

et al. 2015

Sensors and Actuators B: Chemical

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Section: Colorimetric Oxygen Detection With Mb/go-tio 2 -Based Filmsupporting

confidence: 72%

“…The rate increased with raising RH, indicating water plays important roles in the recovery process. Water may stabilize the ionic products of the recovery reaction (i.e., MB + and OH − ) and increase the rate of oxygen diffusion within the film [6,9,10,32].…”

Section: Colorimetric Oxygen Detection With Mb/go-tio 2 -Based Filmmentioning

confidence: 99%

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

Son

Lee

et al. 2015

Sensors and Actuators B: Chemical

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“…Subsequent work, using colloidal TiO 2 , showed that the ink could be printed onto plastic film using an ink-jet printer. 47 More recently, UV-activated, oxygen-sensitive pigment particles, based on the same process as illustrated in Fig. 8 have been produced, 48 and a schematic illustration of their construction is given in Fig.…”

Section: Oxygen Indicatorsmentioning

confidence: 99%

Reductive photocatalysis and smart inks

Mills¹,

Wells²

2015

Chem. Soc. Rev.

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Semiconductor-sensitised photocatalysis is a well-established and growing area of research, innovation and commercialisation; the latter being mostly limited to the use of TiO2 as the semiconductor. Most of the work on semiconductor photocatalytic systems uses oxygen as the electron acceptor and explores a wide range of electron donors; such systems can be considered to be examples of oxidative photocatalysis, OP. OP underpins most current examples of commercial self-cleaning materials, such as: glass, tiles, concrete, paint and fabrics. OP, and its myriad of applications, have been reviewed extensively over the years both in this journal and elsewhere. However, the ability of TiO2, and other semiconductor sensitisers, to promote reductive photocatalysis, RP, especially of dyes, is significant and, although less well-known, is of growing importance. In such systems, the source of the electrons is some easily oxidised species, such as glycerol. One recent, significant example of a RP process is with respect to photocatalyst activity indicator inks. paiis, which provide a measure of the activity of a photocatalytic film under test via the rate of change of colour of the dye in the ink coating due to irreversible RP. In contrast, by incorporating the semiconductor sensitiser in the ink, rather than outside it, it is possible to create an effective UV dosimeter, based on RP, which can be used as a sun-burn warning indicator. In the above examples the dye is reduced irreversibly, but when the photocatalyst in an ink is used to reversibly photoreduce a dye, a novel, colourimetric oxygen-sensitive indicator ink can be created, which has commercial potential in the food packaging industry. Finally, if no dye is present in the ink, and the semiconductor photocatalyst-loaded ink film coats an easily reduced substrate, such as a metal oxide film, then it can be used to reduce the latter and so, for example, clean up tarnished steel. The above are examples of smart inks, i.e. inks that are active and provide either dynamic information (such as UV dose or O2 level) or a useful function (such as tarnish removal), and all work via a RP process and are reviewed here.

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“…Given the volumes of gas encountered, it is essential that such a sensor be reusable and activated using an excitation source that is not common. Lawrie and coworkers [130] have developed a printed UVactivated water-based colorimetric indicator for oxygen, and found a detection low limit of 3%. Detection of thermal hot spots is an important application in monitoring of the human body, industrial equipment and even semiconductor wafers during testing.…”

Section: Sensor-relevant Displaysmentioning

confidence: 99%

Printable Displays and Light Sources for Sensor Applications: A Review

et al. 2015

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Printed light sources, imaging systems and displays have revolutionized modern lifestyle by enriching visual feedback of various devices that human beings interact with. Despite the overall vastness of the field, there have been few to no attempts to place recent progress in these systems in sensor systems. In this short topical review, we survey the current state of art in printed light sources, imaging systems and displays specifically geared towards sensor applications. We find that the definition of displays needs to generalized in light of the availability of disposable colorimetric sensors for various chemical and biological markers. Recent exemplars of progress in each identified area are briefly presented and in conclusion, an overall view of the trends represented by these achievements is discussed.

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Simple inkjet-printed, UV-activated oxygen indicator

Cited by 56 publications

References 23 publications

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

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

Reductive photocatalysis and smart inks

Printable Displays and Light Sources for Sensor Applications: A Review

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