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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

SEM image of the synthesized ZnO nanowires on glass, with different magnifications.
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Figure 0002: SEM image of the synthesized ZnO nanowires on glass, with different magnifications.

Mentions: Figure 2 shows a scanning electron microscopy (SEM) image of ZnO nanowires at different magnifications. From the SEM image, it can be seen that the synthesized ZnO nanowires are preferentially oriented toward the c-axis perpendicular to the glass substrate. The hexagonal structure of the ZnO nanowires can be seen in the magnified SEM image. Also, the magnified view of the nanowire tip reveals the growth of layered hexagonal nanostructures on the tip. This nanoscale roughness on the tip reduces the contact area between the solid and the droplet, which allows the entrapping of a large amount of air below the droplet and, therefore, enhances the hydrophobicity of the surface (13, 14). The length and diameter of the synthesized ZnO nanowires were about 11–12 µm and 400–500 nm, respectively.


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

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

SEM image of the synthesized ZnO nanowires on glass, with different magnifications.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 0002: SEM image of the synthesized ZnO nanowires on glass, with different magnifications.
Mentions: Figure 2 shows a scanning electron microscopy (SEM) image of ZnO nanowires at different magnifications. From the SEM image, it can be seen that the synthesized ZnO nanowires are preferentially oriented toward the c-axis perpendicular to the glass substrate. The hexagonal structure of the ZnO nanowires can be seen in the magnified SEM image. Also, the magnified view of the nanowire tip reveals the growth of layered hexagonal nanostructures on the tip. This nanoscale roughness on the tip reduces the contact area between the solid and the droplet, which allows the entrapping of a large amount of air below the droplet and, therefore, enhances the hydrophobicity of the surface (13, 14). The length and diameter of the synthesized ZnO nanowires were about 11–12 µm and 400–500 nm, respectively.

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