3 July 2017:
Researchers from CNBP’s RMIT University node (lead author CNBP PhD student Marco Capelli pictured), have had a paper published in the journal ‘Nanoscale’.
The researchers report an enhancement of the nitrogen-vacancy (NV) quantum yield by up to 7% in bulk diamond caused by an external magnetic field.
The paper is accessible online.
Publication title: Magnetic field-induced enhancement of the nitrogen-vacancy fluorescence quantum yield .
Authors: M. Capelli, P. Reineck, D. W. M. Lau, A. Orth, J. Jeske, M. W. Doherty, T. Ohshima, A. D. Greentree and B. C. Gibson.
Abstract: The nitrogen-vacancy (NV) centre in diamond is a unique optical defect that is used in many applications today and methods to enhance its fluorescence brightness are highly sought after. We observed experimentally an enhancement of the NV quantum yield by up to 7% in bulk diamond caused by an external magnetic field relative to the field-free case. This observation is rationalised phenomenologically in terms of a magnetic field dependence of the NV excited state triplet-to-singlet transition rate. The theoretical model is in good qualitative agreement with the experimental results at low excitation intensities. Our results significantly contribute to our fundamental understanding of the photophysical properties of the NV defect in diamond.
1 June 2017:
CNBP was well represented at the 11th International Conference on New Diamond and Nano Carbons, held in Cairns, Australia, 28th May – June 1, 2017.
CNBP Chief Investigator A/Prof Brant Gibson was Co-chair of the conference (pictured) with CNBP researcher Dr Philipp Reineck a contributing speaker, presenting on ‘Bright and photostable nitrogen‐vacancy fluorescence from unprocessed detonation nanodiamonds’.
Also providing a contributing talk was CNBP’s Dr Lindsay Parker, ‘Applications of fluorescent nanodiamonds in cellular molecular tracing.’
Additionally, CNBP’s Andrew Greentree, Ivan Maksymov, Daniel Drumm, Ashleigh Heffernan, Marco Capelli, Nicole Cordina and Emma Wilson gave poster presentations and Brooke Bacon and Desmond Lau provided administrative and technical support respectively.
The conference spanned research topics from fundamental physical and chemical concepts to applied technologically driven applications with carbon based materials. This including single crystal diamond, nanodiamonds, carbon nanotubes, graphene and other carbon nanostructures.
17 May 2017:
CNBP’s Dr Philipp Reineck has given a talk at the Aimé-Cotton Laboratory (LAC), Paris, which he is currently visiting as a guest researcher.
The laboratory is a joint research unit of the National Center for Scientific Research (CNRS), the University of Paris-Sud and the Ecole Normale Supérieure de Cachan.
Philipp’s talk consisted of an overview of CNBP science and more specifically, focused on Centre projects across the nano-diamond sensing and bio-imaging space.
10 May 2017:
Dr Philipp Reineck, CNBP Research Fellow, has given an invited talk at the ENM Nanoparticle meeting in San Sebastian in Spain, 10 May 2017.
His talk was titled, ‘Near-IR fluorescent nanomaterials for bioimaging and sensing applications.’ Dr Reineck also chaired a workshop/session on nanoparticles for optical bioimaging.
Further information on the conference can be found online.
1 May 2017:
Dr Philipp Reineck, CNBP Researcher at RMIT University has won best poster award at the 5th International Conference on Biophotonics (ICOB 2017), 30 April – 1 May 2017, Fremantle, Western Australia.
The poster reported on recent advances in the development and use of near-infrared fluorescent nanomaterials for biomedical imaging and sensing applications.
Dr Reineck was originally invited to give a short oral presentation about his poster, which was then selected as a ‘hot poster’ before the conference commenced. It then won ‘best poster’ resulting in a cash prize of $600 AUD.
During his short talk at ICOB, Philipp also discussed the potential of NIR fluorescent materials for wearables – for example, a watch that interrogates particles in bloodstream via near infrared light, to determine glucose levels.
Information about the ICOB conference is available online.
18 January 2017:
Researchers at CNBP’s RMIT University node were busy doing light-based demonstrations on Wednesday Jan 18th, as part of the ‘RMIT University Experience Day’ program, whereby students from years 10, 11 and 12 get to engage in hands-on workshops and explore life on campus while experiencing the differing aspects of University discipline areas.
As part of the ‘experience’ activity, over seventy high school students (predominantly in Year 10) visited the CNBP researchers in their physics laboratories. While there, students were given an overview of biophotonic science as well as laboratory research, and shown the exciting things that can be done with light including 3D scanning, fluorescence microscopy and more.
Below – CNBP researcher Philipp Reineck talks and demonstrates photonics to students.
5 December 2016:
A new publication from CNBP researchers (lead author Philipp Reineck pictured) demonstrates bright and photostable fluorescence from nitrogen-vacancy centers in unprocessed nanodiamond particle aggregates. The work has just been reported in the journal ‘Nanoscale’ and is accessible online.
Title: Bright and photostable nitrogen-vacancy fluorescence from unprocessed detonation nanodiamond.
Authors: P. Reineck, M. Capelli, D. W. M. Lau, J. Jeske, M. R. Field, T. Ohshim, A. D. Greentree and B. C. Gibson.
Abstract: Bright and photostable fluorescence from nitrogen-vacancy (NV) centers is demonstrated in unprocessed detonation nanodiamond particle aggregates. The optical properties of these particles is analyzed using confocal fluorescence microscopy and spectroscopy, time resolved fluorescence decay measurements, and optically detected magnetic resonance experiments. Two particle populations with distinct optical properties are identified and compared to high-pressure high-temperature (HPHT) fluorescent
nanodiamonds. We find that the brightness of one detonation nanodiamond particle population is on the same order as that of highly processed fluorescent 100 nm HPHT nanodiamonds. Our results may open the path to a simple and up-scalable route for
the production of fluorescent NV nanodiamonds for use in bioimaging applications.
20 July 2016:
A research team at the ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP) – led by Dr Philipp Reineck (pictured) from RMIT University’s School of Science – tested ruby and diamond particles, more than a thousand times smaller than the diameter of a hair, alongside other nanoparticles for use in biological imaging, and found that they have a higher degree of stability, critical to achieving imaging success. You can read more about it in the online publication ‘Science meets Business’.
23 June 2016:
CNBP Research Fellow Dr Philipp Reineck (RMIT University node) is lead author on a new research paper, reporting on ‘Brightness and Photostability of Emerging Red and Near-IR Fluorescent Nanomaterials for Bioimaging.’
The work was co-authored by CNBP researchers A/Prof Brant Gibson, Dr Antony Orth and Dr Desmond Lau.
Journal: Advanced Optical Materials
Publication title: Brightness and photostability of emerging red and near-IR fluorescent nanomaterials for bioimaging.
Authors: Philipp Reineck, Adam Francis, Antony Orth, Desmond Wai Mo Lau, Reece David Valmont Nixon-Luke, Ishan Das Rastogi, Wan Aizuddin Wan Razali, Nicole Maree Cordina, Lindsay Marie Parker, Varun Kumaraswamy Annayya Sreenivasan, Louise Jennifer Brown and Brant Cameron Gibson.
Many novel fluorescent nanomaterials exhibit radically different optical properties compared to organic fluorophores that are still the most extensively used class of fluorophores in biology today. Assessing the practical impact of these optical differences for bioimaging experiments is challenging due to a lack of published quantitative benchmarking data. This study therefore directly and quantitatively compares the brightness and photostability of representatives from seven classes of fluorescent materials in spectroscopy and fluorescence microscopy experiments for the first time. These material classes are: organic dyes, semiconductor quantum dots, fluorescent beads, carbon dots, gold nanoclusters, nanodiamonds, and nanorubies. The relative brightness of each material is determined and the minimum material concentrations required to generate sufficient contrast in a fluorescence microscopy image are assessed. The influence of optical filters used for imaging is also discussed and suitable filter combinations are identified. The photostability of all materials is determined under typical imaging conditions and the number of images that can be acquired is inferred. The results are expected to facilitate the transition of novel fluorescent materials from physics and chemistry into biology laboratories.
The publication is accessible online.
Below – An artistic representation of nano-diamonds being used to light up and image a long chain of proteins. Image courtesy of Dr Carlo Bradac.
7 February 2016:
CNBP researchers Peipei Jia (pictured), Philipp Reineck, Ivan Maksymov, Sabrina Heng and Daniel Stubing all attended the International Conference on Nanoscience and Nanotechnology (ICONN), in Canberra (7-11 February 2016).
Peipei Jia, CNBP Research Fellow, presented an invited talk on the topic ‘Large-area Gold Nanomembrane by Template Transfer with a Soluble Polymer’.
Philipp presented a poster on the nanoparticle comparison project, Daniel presented a poster titled “Reversible Ion Sensing With a Flip of a Switch”, while Ivan gave an oral talk on “Photoacoustic nanoantennae for intravascular imaging.”
Sabrina’s poster presentation was titled, “Microstructured Optical Fibers and Photoswitches: Light-Driven Sensors for Metal Ions.”
The event covered the areas of nanostructure growth, synthesis, fabrication, characterization, device design, theory, modeling, testing, applications, commercialisation, and health and safety aspects of nanotechnology.
Further information on the conference is available online.