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LED-controlled tuning of ZnO nanowires' wettability for biosensing applications.

Bhavsar K, Ross D, Prabhu R, Pollard P - Nano Rev (2015)

Bottom Line: The investigations on spectral properties of the LED emission on ZnO nanowires' wettability have shown strong dependency on the spectral overlap of LED emission on ZnO absorption spectra.The spectral investigations have provided significant insight into the role of irradiating wavelength of light and irradiation time on the surface wettability of ZnO nanowires.This process is suitable to realize on chip based integrated sensors and has huge potential for eco-friendly biosensing and environmental sensing applications.

View Article: PubMed Central - PubMed

Affiliation: IDEAS Research Institute, Robert Gordon University, Aberdeen, UK.

ABSTRACT

Background: Wettability is an important property of solid materials which can be controlled by surface energy. Dynamic control over the surface wettability is of great importance for biosensing applications. Zinc oxide (ZnO) is a biocompatible material suitable for biosensors and microfluidic devices. Nanowires of ZnO tend to show a hydrophobic nature which decelerates the adhesion or adsorption of biomolecules on the surface and, therefore, limits their application.

Methods: Surface wettability of the ZnO nanowires can be tuned using light irradiation. However, the control over wettability using light-emitting diodes (LEDs) and the role of wavelength in controlling the wettability of ZnO nanowires are unclear. This is the first report on LED-based wettability control of nanowires, and it includes investigations on tuning the desired wettability of ZnO nanowires using LEDs as a controlling tool.

Results: The investigations on spectral properties of the LED emission on ZnO nanowires' wettability have shown strong dependency on the spectral overlap of LED emission on ZnO absorption spectra. Results indicate that LEDs offer an advanced control on dynamically tuning the wettability of ZnO nanowires.

Conclusion: The spectral investigations have provided significant insight into the role of irradiating wavelength of light and irradiation time on the surface wettability of ZnO nanowires. This process is suitable to realize on chip based integrated sensors and has huge potential for eco-friendly biosensing and environmental sensing applications.

No MeSH data available.


Related in: MedlinePlus

A schematic view of the experimental set-up.
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Figure 0001: A schematic view of the experimental set-up.

Mentions: A schematic view of the experimental setup for irradiating the samples with LEDs is shown in Fig. 1. LEDs were purchased from Nichia Corporation (λp=365 nm and 385 nm) and Avago Technologies (λp=454 nm and 519 nm). Full spectral widths at the half maximum of the LEDs (λp=365 nm, 385 nm, 454 nm and 519 nm) were 15 nm, 15 nm, 25 nm and 30 nm, respectively. LED emission was coupled through a bi-convex lens and irradiated over the sample placed on a sample stage. A neutral-density filter and aperture were used to control the optical power density. A dichroic mirror was used in the path to reflect a fraction of the light for monitoring the power level with a Coherent (FieldMaster GS) power meter and/or LED spectra with a StellerNet (EPP2000C) spectrometer. The surface wettability of the developed ZnO nanowires has been studied using the contact angle measurement system, by measuring the water contact angle (WCA) before and after the light irradiation for different time durations. All light irradiation experiments were performed at constant optical power. All contact angle measurements were carried out using 2-µl water drop under ambient conditions.


LED-controlled tuning of ZnO nanowires' wettability for biosensing applications.

Bhavsar K, Ross D, Prabhu R, Pollard P - Nano Rev (2015)

A schematic view of the experimental set-up.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390563&req=5

Figure 0001: A schematic view of the experimental set-up.
Mentions: A schematic view of the experimental setup for irradiating the samples with LEDs is shown in Fig. 1. LEDs were purchased from Nichia Corporation (λp=365 nm and 385 nm) and Avago Technologies (λp=454 nm and 519 nm). Full spectral widths at the half maximum of the LEDs (λp=365 nm, 385 nm, 454 nm and 519 nm) were 15 nm, 15 nm, 25 nm and 30 nm, respectively. LED emission was coupled through a bi-convex lens and irradiated over the sample placed on a sample stage. A neutral-density filter and aperture were used to control the optical power density. A dichroic mirror was used in the path to reflect a fraction of the light for monitoring the power level with a Coherent (FieldMaster GS) power meter and/or LED spectra with a StellerNet (EPP2000C) spectrometer. The surface wettability of the developed ZnO nanowires has been studied using the contact angle measurement system, by measuring the water contact angle (WCA) before and after the light irradiation for different time durations. All light irradiation experiments were performed at constant optical power. All contact angle measurements were carried out using 2-µl water drop under ambient conditions.

Bottom Line: The investigations on spectral properties of the LED emission on ZnO nanowires' wettability have shown strong dependency on the spectral overlap of LED emission on ZnO absorption spectra.The spectral investigations have provided significant insight into the role of irradiating wavelength of light and irradiation time on the surface wettability of ZnO nanowires.This process is suitable to realize on chip based integrated sensors and has huge potential for eco-friendly biosensing and environmental sensing applications.

View Article: PubMed Central - PubMed

Affiliation: IDEAS Research Institute, Robert Gordon University, Aberdeen, UK.

ABSTRACT

Background: Wettability is an important property of solid materials which can be controlled by surface energy. Dynamic control over the surface wettability is of great importance for biosensing applications. Zinc oxide (ZnO) is a biocompatible material suitable for biosensors and microfluidic devices. Nanowires of ZnO tend to show a hydrophobic nature which decelerates the adhesion or adsorption of biomolecules on the surface and, therefore, limits their application.

Methods: Surface wettability of the ZnO nanowires can be tuned using light irradiation. However, the control over wettability using light-emitting diodes (LEDs) and the role of wavelength in controlling the wettability of ZnO nanowires are unclear. This is the first report on LED-based wettability control of nanowires, and it includes investigations on tuning the desired wettability of ZnO nanowires using LEDs as a controlling tool.

Results: The investigations on spectral properties of the LED emission on ZnO nanowires' wettability have shown strong dependency on the spectral overlap of LED emission on ZnO absorption spectra. Results indicate that LEDs offer an advanced control on dynamically tuning the wettability of ZnO nanowires.

Conclusion: The spectral investigations have provided significant insight into the role of irradiating wavelength of light and irradiation time on the surface wettability of ZnO nanowires. This process is suitable to realize on chip based integrated sensors and has huge potential for eco-friendly biosensing and environmental sensing applications.

No MeSH data available.


Related in: MedlinePlus