Detection of G-Type Nerve Agent Simulants Based on a Double Reflection DBR Porous Silicon Interferometer

다국어 초록 (Multilingual Abstract)

Distributed Bragg reflector (DBR) porous silicon (PSi) chips with
two reflection peaks were fabricated by electrochemical etching in
an aqueous ethanolic HF solution and were used to detect of chemical
nerve agent simulants. Dimethyl methylphosphonate (DMMP) is a
simulant for G-type nerve agents. The manufactured DBR PSi chips
exhibit two sharp photonic bands, 560 and 717 nm, with narrow full
widths at half maximum (FWHM) of 15 and 20 nm, respectively. The
detection method involved the shift of the DBR reflection peaks in
the reflectivity spectra under exposure to vapors of the analyte.
Rapid detection was achieved in few seconds in situ and the
observed red shift of the DBR peaks resulted from an increase in the
refractive indices in DBR PSi. When the DBR PSi chips were exposed
to vapor of DMMP, the two reflection peaks from DBR PSi were
red-shifted by 22 and 32 nm, respectively. Real-time detection for
the stimulant indicated that the detection measurements were
reversible. Detection of other analytes, such as triethyl phosphate
(TEP) and diethyl ethylphosphonate (DEEP), has been also achieved.

다국어 초록 (Multilingual Abstract)

Distributed Bragg reflector (DBR) porous silicon (PSi) chips with
two reflection peaks were fabricated by electrochemical etching in
an aqueous ethanolic HF solution and were used to detect of chemical
nerve agent simulants. Dimethyl methylphosphonate (DMMP) is a
simulant for G-type nerve agents. The manufactured DBR PSi chips
exhibit two sharp photonic bands, 560 and 717 nm, with narrow full
widths at half maximum (FWHM) of 15 and 20 nm, respectively. The
detection method involved the shift of the DBR reflection peaks in
the reflectivity spectra under exposure to vapors of the analyte.
Rapid detection was achieved in few seconds in situ and the
observed red shift of the DBR peaks resulted from an increase in the
refractive indices in DBR PSi. When the DBR PSi chips were exposed
to vapor of DMMP, the two reflection peaks from DBR PSi were
red-shifted by 22 and 32 nm, respectively. Real-time detection for
the stimulant indicated that the detection measurements were
reversible. Detection of other analytes, such as triethyl phosphate
(TEP) and diethyl ethylphosphonate (DEEP), has been also achieved.

참고문헌 (Reference)

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