A colorimetric method with the use of BDJ detector for seawater pH measurement

Sedjil, Mohamed; Lu, Guo‐Neng; Michard, Gil; Prévot, Frédéric

doi:10.1016/s0003-2670(98)00525-x

Cited by 14 publications

(14 citation statements)

References 8 publications

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“…5: a package of two chosen LEDs was used as a dualwavelength light-source. Its peak wavelengths were 450 nm and 626 nm, respectively, which were corresponding to the absorbance peak and valley of the experimental solutions [8]. The colorimetric vessel was 10 cm long.…”

Section: Methodsmentioning

confidence: 99%

“…To increase the sensitivity of the photocurrent ratio R dual to the variation of solution concentration C, the two wavelengths k 1 and k 2 should be properly chosen; for example, we can choose the peak absorption wavelength as k 1 and a minimum absorption wavelength as k 2 to obtain a large term [j(k 2 ) À j(k 1 )] [8].…”

Section: Principlementioning

confidence: 99%

“…In recent years, the BDJ (buried double p-n junction) optical wavelength sensor has attracted much attention in colorimetric measurements such as iron concentration measurement [7] and seawater pH determination [8]. In those reports, a dual-wavelength light-source (i.e., two LEDs) was employed, chemical agents were added into the solutions, and the iron concentration or PH value was determined by measuring the chroma of the reaction output [7,8] wavelength can be absorbed by the colored solutions and the changes of effective wavelength of the transmitted dual-wavelength light can be measured by the sensor.…”

Section: Introductionmentioning

confidence: 99%

“…In those reports, a dual-wavelength light-source (i.e., two LEDs) was employed, chemical agents were added into the solutions, and the iron concentration or PH value was determined by measuring the chroma of the reaction output [7,8] wavelength can be absorbed by the colored solutions and the changes of effective wavelength of the transmitted dual-wavelength light can be measured by the sensor.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

et al. 2009

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Section: Methodsmentioning

confidence: 99%

Section: Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

et al. 2009

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“…The CMOS BDJ detector has been used for fluorescence detection in microarrays [77], and for the detection and measurement of ambient light sources [78]. The BDJ color detectors have been used in many chemical and biological sensors such as seawater pH measurement [79] and volatile organic compounds detection [80].…”

Section: Tune Device Responsivitymentioning

confidence: 99%

CMOS Photodetectors

Albert¹,

C-K.²,

Vamsy³

2011

Photodiodes - World Activities in 2011

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MoS₂/HfO₂/Silicon‐On‐Insulator Dual‐Photogating Transistor with Ambipolar Photoresponsivity for High‐Resolution Light Wavelength Detection

Deng

Zong

Zhu

et al. 2019

Adv Funct Materials

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Photogating detectors based on 2D materials attract significant research interests. However, most of these photodetectors are only sensitive to the incident intensities and lack the ability to distinguish different wavelengths. Color imaging based on these detectors usually requires additional optical filter arrays to collect red, green, and blue (RGB) colors in different photodetectors to restore the true color of one pixel. In this study, an MoS2/HfO2/silicon‐on‐insulator field effect phototransistor with wavelength distinguishing ability is presented, where the photogating effect can be simultaneously formed in the top MoS2 gate and bottom Si substrate gate. These two individual photogating effects can reduce and increase the read current in the middle 12 nm Si channel, respectively. Thus, by tuning the applied voltages on these two gates, the device can be used to obtain tunable ambipolar photoresponsivity from +7000 A W−1 (Si bottom gate dominated) to 0 A W−1 (balanced), and finally to −8000 A W−1 (MoS2 gate dominated). In addition, the experimental results show that the corresponding top gate voltage to the zero responsivity (0 A W−1) point can be positively shifted by the increasing of incident wavelength with high resolution up to 2 nm and is insensitive to the incident intensity.

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A colorimetric method with the use of BDJ detector for seawater pH measurement

Cited by 14 publications

References 8 publications

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

CMOS Photodetectors

MoS₂/HfO₂/Silicon‐On‐Insulator Dual‐Photogating Transistor with Ambipolar Photoresponsivity for High‐Resolution Light Wavelength Detection

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A colorimetric method with the use of BDJ detector for seawater pH measurement

Cited by 14 publications

References 8 publications

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

Quality monitoring of flowing water using colorimetric method based on a semiconductor optical wavelength sensor

CMOS Photodetectors

MoS2/HfO2/Silicon‐On‐Insulator Dual‐Photogating Transistor with Ambipolar Photoresponsivity for High‐Resolution Light Wavelength Detection

Contact Info

Product

Resources

About

MoS₂/HfO₂/Silicon‐On‐Insulator Dual‐Photogating Transistor with Ambipolar Photoresponsivity for High‐Resolution Light Wavelength Detection