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Dive into the research topics where Timothy van der Laan is active.

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Featured researches published by Timothy van der Laan.


Journal of Materials Chemistry C | 2015

Structure and photoluminescence of boron-doped carbon nanoflakes grown by hot filament chemical vapour deposition

Biben Wang; K. Ostrikov; Timothy van der Laan; Ruiwen Shao; Lin Li

Boron-doped carbon nanoflakes were directly synthesized by hot filament chemical vapor deposition, nontoxic boron carbide was used as the boron source. The results of scanning electron microscopy (SEM), micro-Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) indicate that boron is effectively doped in the carbon nanoflakes. The number of defects as well as the density of the carbon nanoflakes is increased due to the doping process. The photoluminescence (PL) properties of carbon nanoflakes with and without boron doping were studied at room temperature, the 325 nm line of He–Cd laser was used as the excitation source. The PL results reveal that the carbon nanoflakes with and without doping of boron can generate both weak blue and strong green PL bands. The results also show a blue shift of PL bands and an enhanced PL intensity after boron doping. This is attributed to an increase in the band gap of carbon nanoflakes upon boron incorporation. These results improve our knowledge of the synthesis and optical properties of graphene-based materials and contribute to the development of graphene-based optoelectronic devices.


Biosensors and Bioelectronics | 2017

Multifunctional graphene micro-islands: Rapid, low-temperature plasma-enabled synthesis and facile integration for bioengineering and genosensing applications.

Shafique Pineda; Fabricio Frizera Borghi; Dong Han Seo; Samuel Yick; Malcolm A. Lawn; Timothy van der Laan; Zhao Jun Han; K. Ostrikov

Here, we present a rapid, low-temperature (200°C) plasma-enabled synthesis of graphene micro-islands (GMs). Morphological analyses of GMs by scanning electron microscopy (SEM) and atomic force microscopy (AFM) feature a uniform and open-networked array of aggregated graphene sheets. Structural and surface chemical characterizations by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) support the presence of thin graphitic edges and reactive oxygen functional groups. We demonstrate that these inherent properties of GMs enable its multifunctional capabilities as a bioactive interface. GMs exhibit a biocompatibility of 80% cell viability with primary fibroblast lung cells after 5 days. Further, GMs were assembled into an impedimetric genosensor, and its performance was characterized by electrochemical impedance spectroscopy (EIS). A dynamic sensing range of 1pM to 1nM is reported, and a limit of quantification (LOQ) of 2.03×10-13M is deduced, with selectivity to single-RNA-base mismatched sequences. The versatile nature of GMs may be explored to enable multi-faceted bioactive platforms for next-generation personalized healthcare technologies.


Science & Engineering Faculty | 2014

Biological Application of Carbon Nanotubes and Graphene

Zhao Jun Han; Amanda E. Rider; Caitlin Fisher; Timothy van der Laan; Shailesh Kumar; I. Levchenko; K. Ostrikov

Abstract Carbon nanotubes (CNTs) and graphene are low-dimensional nanomaterials that have attracted tremendous scientific and industrial interest in the last two decades. Besides the traditional electronic and optical applications, they also hold a great promise in the biological and medical fields. This chapter summarizes the recent progress of CNTs and graphene in biological applications and presents some of the most intriguing examples, including biosensors, diagnostic and imaging tools, therapeutic drug delivery systems, anti-cancer research, tissue engineering scaffolds and neuron prosthesis. It attempts to demonstrate the advantages and challenges in the current development of CNT- and graphene-based biomedical devices, as well as to shed light on better utilizing these materials by possibly controlling their structure and functionalities.


Advanced Functional Materials | 2014

Multifunctional Three-Dimensional T-Junction Graphene Micro-Wells: Energy-Efficient, Plasma-Enabled Growth and Instant Water-Based Transfer for Flexible Device Applications

Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov


Nanoscale | 2015

Water-mediated and instantaneous transfer of graphene grown at 220 °C enabled by a plasma

Timothy van der Laan; Shailesh Kumar; K. Ostrikov


Institute for Future Environments; Science & Engineering Faculty | 2017

Multifunctional graphene micro-islands: Rapid, low-temperature plasma-enabled synthesis and facile integration for bioengineering and genosensing applications

Shafique Pineda; Fabricio Frizera Borghi; Dong Han Seo; Samuel Yick; Malcolm A. Lawn; Timothy van der Laan; Zhao Jun Han; K. Ostrikov


Science & Engineering Faculty | 2014

Multifunctional three-dimensional T-junction graphene micro-wells: Energy-efficient, plasma-enabled growth and instant water-based transfer for flexible device applications

Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; Ken Ostrikov


Science & Engineering Faculty | 2014

Energy-efficient growth: Multifunctional three-dimensional T-junction graphene micro-wells: Energy-efficient, plasma-enabled growth and instant water-based transfer for flexible device applications (Adv. Funct. Mater. 39/2014)

Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov


Science & Engineering Faculty | 2014

Multipurpose nanoporous alumina-carbon nanowall bi-dimensional nano-hybrid platform via catalyzed and catalyst-free plasma CVD

Jinghua Fang; I. Levchenko; Timothy van der Laan; Shailesh Kumar; K. Ostrikov


Advanced Functional Materials | 2014

Energy‐Efficient Growth: Multifunctional Three‐Dimensional T‐Junction Graphene Micro‐Wells: Energy‐Efficient, Plasma‐Enabled Growth and Instant Water‐Based Transfer for Flexible Device Applications (Adv. Funct. Mater. 39/2014)

Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov

Collaboration


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K. Ostrikov

Queensland University of Technology

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Amanda E. Rider

Commonwealth Scientific and Industrial Research Organisation

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Shailesh Kumar

Commonwealth Scientific and Industrial Research Organisation

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Lakshman Randeniya

Commonwealth Scientific and Industrial Research Organisation

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Zhao Jun Han

Commonwealth Scientific and Industrial Research Organisation

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Shailesh Kumar

Commonwealth Scientific and Industrial Research Organisation

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Dong Han Seo

Commonwealth Scientific and Industrial Research Organisation

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I. Levchenko

Commonwealth Scientific and Industrial Research Organisation

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Malcolm A. Lawn

National Measurement Institute

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