Conference Programme

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Overview
Session
L-05: Symp L
Time:
Tuesday, 20/Jun/2017:
4:00pm - 6:15pm

Session Chair: Marc-Olivier Coppens, University College London
Location: Rm 309

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Presentations
4:00pm - 4:30pm
Keynote

Design of Plasmonic Catalysts for Efficient H2 Production from Hydrogen Carrier Molecules

Hiromi YAMASHITA, Kohsuke MORI, Yasutaka KUWAHARA

Osaka University, Japan

The efficient catalytic performances for H2 production from NH3BH3 and HCOOH as hydrogen carrier molecules were achieved by the localized surface plasmon resonance (LSPR) inductive promotion effect of bimetallic Pd/Ag/SBA-15, Pd/MoO3-x and Au@Pd /MOF(UiO-66) catalysts.


4:30pm - 5:00pm
Invited

Facile Synthesis of Nanostructured Phosphide Electrocatalysts

Nicola PINNA, Patricia RUSSO, Rui ZHANG

Humboldt University of Berlin, Germany

Hydrogen is considered as a promising clean fuel for replacing fossil fuels in the future.Electrochemical water splitting, in combination with renewable energy sources, is a sustainable method for large-scale H2 production.1 The hydrogen evolution reaction (HER) is the cathodic half-reaction of water splitting. Efficient electrocatalysts are required to drive the HER at low overpotentials. Platinum is the best known catalyst for HER but its high cost limits its application. Recently, transition metal phosphides (TMPs) have emerged as highly active HER catalysts.2 However, the synthesis of nanostructured TMPs is very challenging, as it normally involves highly toxic and reactive compounds. Herein, we report a simple and non-hazardous approach for fabricating TMPs electrocatalysts from single-source precursors. Nanostructured nickel and cobalt phosphides were prepared following this approach. The Ni12P5-Ni2P and Ni2P nanoparticles synthesized efficiently catalyzed the HER in acidic medium. In particular, the Ni2P nanoparticles were able to achieve a cathodic current density of 10 mA cm-2 at an overpotential of 87 mV and exhibited very good long-term stability.

References:

[1] T. R. Cook, D. K. Dogutan, S. Y. Reece, Y. Surendranath, T. S. Teets, D. G. Nocera, Chem. Rev. 2010, 110, 6474-6502.

[2] E. J. Popczun, J. R. McKone, C. G. Read, A. J. Biacchi, A. M. Wiltrout, N. S. Lewis, R. E. Schaak, J. Am. Chem. Soc. 2013, 135, 9267-9270.


5:00pm - 5:15pm
Oral

Tailoring Rare-Earth Doped Nanoparticle Dispersion for Polymer Based Waveguide Amplifier

Xinyu ZHAO1, Yang SUN2, George CHEN1, Chaobin HE2,3, Dawn TAN1, Mei Chee TAN1

1Engineering Product Development, Singapore University of Technology and Design, Singapore; 2Department of Materials Science & Engineering, National University of Singapore, Singapore; 3Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore

Infrared (IR)-emitting erbium (Er)-doped systems are commonly used to fabricate the waveguide amplifiers since the 4I13/24I15/2 transition of Er3+ ions falls within the telecommunication window from 1.30–1.65 µm. Er-doped inorganic nanocrystals dispersed within polymer matrices to construct polymer waveguide amplifiers offer an attractive low cost versatile solution where the benefits of both the polymer and ceramic components are harnessed. To obtain highly emissive nanocomposites for fabricating high gain waveguide amplifiers, it is desirable to enhance the IR emission efficiency of the nanoparticle emitters, maximize nanoparticle loading in the polymer matrix and minimize scattering losses due to particle agglomeration. In this presentation, we will discuss the synthesis of Er-doped nanoparticles with enhanced IR emission efficiency by controlling the dopant chemistry. We will also present a facile approach to fabricate low-loss IR-emitting nanostructured composites that exhibit single particle dispersion at high solid loading through tailoring the nanoparticle surface chemistry using an amphiphilic surfactant. We will demonstrate a rib configuration polymer waveguide amplifier with a high gain using our IR enhanced nanoparticles and particle dispersion strategy. The high IR-emitting efficiency of Er-doped nanoparticles, small particle size and excellent nanoparticle dispersion control within polymer matrix contribute to the high gain of polymer waveguide amplifier.


5:15pm - 5:30pm
Oral

Fabrication and Interfacial Characteristics of Conductive Composites using Surface-Modified Ag Particles

Yingsi WU1, Lun-De LIAO2, Han-Chi PAN2, Leng HE2,3, Mei Chee TAN1

1Singapore University of Technology and Design, Singapore; 2National Health Research Institutes, Taiwan; 3National Chiao Tung University, Taiwan

Conductive polymer composites have expansive applications in electronic skin sensors, diagnostic devices, light-emitting diodes and electrochemical devices. The surface characteristics of the conductive fillers are critical towards achieving a good dispersion within the polymer matrix so as to obtain the good electrical conductivity and flexibility. In this work, we will present a simple one-step approach to modify the PAA-coated Ag nanoparticles (PAA-Ag nanoparticles) with PVP using a complexation method. The interfacial characteristics are investigated by FTIR, TGA and DSC techniques to verify the formation of hydrogen bond as well as to evaluate the thermal stability of the surface modified particles. Subsequently, our PAA-PVP-modified Ag nanoparticles with a molar PAA/PVP ratio of 1:10 show a homogeneous dispersion in PDMS with minimal particle aggregation. The surfactant complexation process is shown to successfully improve the dispersion of the modified-Ag nanoparticles in elastic PDMS matrix, and enabled a Ag loading of up to 25 vol% and where the measured volumetric electrical resistivity was as low as 6 Ω.cm. The facile inter-polymer complexation method introduced here can be used in the surface modification of metal nanoparticles, for the purpose of improving the filler dispersion in elastic polymers with controllable metal loadings for various applications in flexible electrodes.


5:30pm - 5:45pm
Oral

Graphene Quantum Dot- Magnetite Composite to Detect Glucose

Soumalya MUKHERJEE1, Edamana PRASAD3, Anju CHADHA1,2

1Department of Biotechnology, Indian Institute of Technology, Madras, India; 2National Centre for Catalysis Research, Indian Institute of Technology, Madras, India; 3Department of Chemistry, Indian Institute of Technology, Madras, India

Composites of graphene and magnetite nanoparticles (Fe-GQD) were synthesized using a microwave assisted hydrothermal method. Unlike the pristine nitrogen functionalized graphene quantum dots (N-GQDs) [1], the as-synthesized Fe-GQDs exhibit a blue photoluminescence (PL), independent of both the excitation wavelength and the dispersant. Growth along specific crystal faces of the metal nanoparticle was mediated by the interaction of the GQDs and the magnetite nanoparticles resulting in control over their morphology. A sensitive glucose sensor was conceptualized from this composite material with sensitivity several orders of magnitude higher than the enzyme based sensor [GOD-POD i.e. glucose oxidase – peroxidase], with a limit of detection (LOD) of ~ 75 nmol as determined by this method. Change in PL intensity of the as-synthesized Fe-GQDs was calibrated against the concentration of the analyte. Additionally, the presence of glucose can also be monitored optically using this sensor when integrated with a dye, thus opening avenues for a straight forward point-of care biosensor. The experimental design and the observations regarding the anisotropic growth of the Fe-GQDs will be presented in the talk.

Reference:

[1] Deng, X.; Sun, J.; Yang, S.; Shen, H.; Zhou, W.; Lu, J.; Ding, G.; Wang, Z. The Emission Wavelength Dependent Photoluminescence Lifetime Of The N-Doped Graphene Quantum Dots. Applied Physics Letters 2015, 107, 241905.


5:45pm - 6:15pm
Invited

Graphene-Metal Oxide based Nanocomposites for Energy and Environmental Applications

R. JAYAVEL

Anna University, India

Two dimensional graphene-based nanocomposites are emerging as a new class of materials with excellent properties, leading to their potential application in different areas. The study of decorating the graphene sheets with inorganic functional materials is now becoming a promising and challenging area of research. In this study, reduced graphene metal-oxide composites with SnO2, CeO2, MoS2, V2O5 and CdS have been synthesized by homogeneous co-precipitation method[1,2]. Multi-layered composite structures with 1 D carbon nanotubes integrated with 2 D graphene structures with the addition of 3 D bulk nanoparticles were prepared with improved properties [3]. The structural properties of the graphene oxide, graphene-metal oxide composites have been systematically studied. The prepared composite structure has been subjected to structural, optical, electrical property studies. The photocatalytic properties of the composites were studied for the degradation of organic dyes from industrial waste water [4]. The electrochemical properties of Graphene-metal oxide composites reveal that these materials can be effectively used as electrodes for supercapacitor application with improved specific capacitance, higher power density and cyclic stability [5,6]. Flexible free standing rGO papers have been fabricated by evaporation induced self assembly process and their electrical, mechanical, optical and electrochemical properties have also been studied [7,8].

References:

[1]. T. Saravanan, et. al., Dalton Trans., 44 (2015) 9901-9908.

[2]. M. Shanmugam, et. al., ACS Appl. Mater. & Inter., 7 (2015) 14905-14911.

[3]. R. Raja, et. al. J. Mater. Chem. A, 2 (2014) 18480-18487.

[4]. M. Shanmugam, et . al. J. Photochem. Photobiology B, 163 (2016) 216–223.

[5]. M Murugan, et. al., Chem. Phys. Lett. Vol. 650 (2016) 35-40.

[6]. R. Thangappan, et; al. Dalton Trans., Vol.45 (2016) 2637-2646.

[7]. D.Selvakumar, et. al., J. Mat. Sci.: Mater. Electronics., 27 (2016) 6232-6241.

[8]. D. Selvakumar et. al. Mater. Lett. 191 (2017) 182.



 
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