GaN quantum dots as optical transducers for chemical sensors

2009 ◽  
Vol 94 (11) ◽  
pp. 113108 ◽  
Author(s):  
O. Weidemann ◽  
P. K. Kandaswamy ◽  
E. Monroy ◽  
G. Jegert ◽  
M. Stutzmann ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Chemical Sensors ◽  
Optical Transducers

GaN Quantum Dots as Optical Transducers in Field Effect Chemical Sensors

2007 ◽  
Author(s):  
O. Weidemann ◽  
G. Jegert ◽  
S. Birner ◽  
M. Stutzmann ◽  
M. Eickhoff ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Chemical Sensors ◽  
Field Effect ◽  
Optical Transducers

Quantum dots as self-referenced optical fibre temperature probes for luminescent chemical sensors

2006 ◽  
Vol 17 (5) ◽  
pp. 1032-1038 ◽  
Author(s):  
P A S Jorge ◽  
M Mayeh ◽  
R Benrashid ◽  
P Caldas ◽  
J L Santos ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Fibre ◽  
Chemical Sensors

Phthalocyanine-based hybrid materials for chemosensing

2013 ◽  
Vol 17 (10) ◽  
pp. 913-919 ◽  
Author(s):  
Marcel Bouvet ◽  
Pierre Gaudillat ◽  
Jean-Moïse Suisse
Keyword(s):  
Specific Surface ◽  
Hybrid Materials ◽  
Chemical Sensors ◽  
Morphological Characteristics ◽  
Present Review ◽  
Carbonaceous Materials ◽  
Sensing Material ◽  
Chemical Variability ◽  
Optical Transducers ◽  
Macrocyclic Molecules

In the present review, we show how the chemical variability of phthalocyanines allowed to synthesize a broad range of hybrid materials. The combination of phthalocyanines or related derivatives with polymers or carbonaceous materials led to efficient chemical sensors. It is shown how the incorporation of macrocyclic molecules in hybrid materials highly modifies the structural and morphological characteristics of the materials. Rugosity, specific surface and porosity being key parameters in the analyte-sensing material interactions, these modifications highly improve the performance of chemical sensors. This is the reason why they are particularly promising materials for the development of new chemical sensors, associated with electrochemical, conductometric or optical transducers.

Quantum dots in semiconductor chemical sensors and biosensors

2011 ◽  
Vol 44 (13) ◽  
pp. S223 ◽  
Author(s):  
Zakavati Roya ◽  
Bayat Mansour ◽  
Mohsenifar Afshin ◽  
Hashemi Hezaveh Gamal
Keyword(s):  
Quantum Dots ◽  
Chemical Sensors

Lanthanide macrocyclic complexes: from molecules to materials and from materials to devices

2013 ◽  
Vol 17 (08n09) ◽  
pp. 628-635 ◽  
Author(s):  
Marcel Bouvet ◽  
Pierre Gaudillat ◽  
Jean-Moïse Suisse
Keyword(s):  
Chemical Sensors ◽  
Driving Force ◽  
Electronic Devices ◽  
Macrocyclic Complexes ◽  
High Conductivity ◽  
Present Review ◽  
Wide Range ◽  
Optical Transducers ◽  
Molecular Semiconductors ◽  
Very High

In the present review, we show how the chemistry of lanthanide macrocyclic complexes, which began almost 50 years ago in Russia, is still very active. Additionally to bisphthalocyanines complexes, triple-decker, but also quadruple- and quintuple-decker complexes have been synthesized via new chemical routes. The driving force for the development of this chemistry arises from the wide range of possible applications. Owing to their very high conductivity, compared to that of monophthalocyanines, LnPc2 and Ln2Pc3 complexes are used as molecular semiconductors in electronic devices. The radical nature of LnPc2 complexes makes them easily oxidized and reduced. This is the reason why they are particularly promising materials for the development of new chemical sensors, associated with both conductimetric and optical transducers.

scholarly journals Semiconductor Quantum Dots in Chemical Sensors and Biosensors

Sensors ◽  
2009 ◽  
Vol 9 (9) ◽  
pp. 7266-7286 ◽  
Author(s):  
Manuela Frasco ◽  
Nikos Chaniotakis
Keyword(s):  
Quantum Dots ◽  
Chemical Sensors ◽  
Semiconductor Quantum Dots

Self-referenced intensity based optical fiber temperature probes for luminescent chemical sensors using quantum dots

2005 ◽  
Author(s):  
P. A. S. Jorge ◽  
M. Mayeh ◽  
R. Benrashid ◽  
P. Caldas ◽  
J. L. Santos ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Fiber ◽  
Chemical Sensors

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

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