Timothy van der Laan
University of Sydney
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Publication
Featured researches published by Timothy van der Laan.
Journal of Materials Chemistry C | 2015
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
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
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
Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov
Nanoscale | 2015
Timothy van der Laan; Shailesh Kumar; K. Ostrikov
Institute for Future Environments; Science & Engineering Faculty | 2017
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
Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; Ken Ostrikov
Science & Engineering Faculty | 2014
Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov
Science & Engineering Faculty | 2014
Jinghua Fang; I. Levchenko; Timothy van der Laan; Shailesh Kumar; K. Ostrikov
Advanced Functional Materials | 2014
Shailesh Kumar; Timothy van der Laan; Amanda E. Rider; Lakshman Randeniya; K. Ostrikov
Collaboration
Dive into the Timothy van der Laan's collaboration.
Commonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputsCommonwealth Scientific and Industrial Research Organisation
View shared research outputs