Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Doiron:2019:10.1021/acs.jpcc.9b03184,
author = {Doiron, B and Li, Y and Mihai, A and Bower, R and Alford, NM and Petrov, PK and Maier, SA and Oulton, RF},
doi = {10.1021/acs.jpcc.9b03184},
journal = {The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces},
pages = {18521--18527},
title = {Plasmon-enhanced electron harvesting in robust titanium nitride nanostructures},
url = {http://dx.doi.org/10.1021/acs.jpcc.9b03184},
volume = {123},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Titanium nitride (TiN) continues to prove itself as an inexpensive, robust, and efficient alternative to gold in plasmonic applications. Notably, TiN has improved hot electron-harvesting and photocatalytic abilities compared to gold systems, which we recently attributed to the role of oxygen in TiN and its native semiconducting TiO2–x surface layer. Here, we explore the role of localized surface plasmon resonances (LSPRs) on electron harvesting across the TiN/TiO2–x interface and probe the resilience of TiN nanostructures under high-power laser illumination. To investigate this, we fabricate TiN strips, in which the lateral confinement allows for the polarization-selective excitation of the LSPR. Using ultrafast pump–probe spectroscopy, optical characterization, and Raman vibrational spectroscopy, we relate the differences and changes observed in the electron behavior to specific material properties. We observe plasmon-enhanced electron harvesting beyond what is expected resulting from the enhanced absorption of the plasmonic mode. We accredit this to the surface oxide damping the plasmon resonance, providing additional nonradiative loss channels. Subsequently, we show that low-power annealing of the surface oxide layer reduces the trap density at the interface and increases the initial harvested electron concentration. The unique properties of TiN make it important in the future development of plasmonic electron-harvesting applications.
AU - Doiron,B
AU - Li,Y
AU - Mihai,A
AU - Bower,R
AU - Alford,NM
AU - Petrov,PK
AU - Maier,SA
AU - Oulton,RF
DO - 10.1021/acs.jpcc.9b03184
EP - 18527
PY - 2019///
SN - 1932-7447
SP - 18521
TI - Plasmon-enhanced electron harvesting in robust titanium nitride nanostructures
T2 - The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces
UR - http://dx.doi.org/10.1021/acs.jpcc.9b03184
UR - http://hdl.handle.net/10044/1/72696
VL - 123
ER -