Oxidised porous silicon impregnated with Congo Red for chemical sensoring applications

Rivolo, Paola; Pirasteh, Parastesh; Chaillou, Annick; Joubert, P.; Kloul, M.; Bardeau, Jean‐François; Geobaldo, Francesco

doi:10.1016/j.snb.2003.12.029

Cited by 33 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mesoporous silica co-assembled with dyes has been studied recently as a new generation of composite materials with sensing properties, as for pH sensing [8]. Oxidized porous silicon (OPS) is an inert and stable material; it can be used as host for dyes.…”

Section: Pore Shapementioning

confidence: 99%

Fabrication of Congo Red/Oxidized Porous Silicon (CR/OPS) pH-Sensors

Kashyout¹,

Soliman²,

Nabil³

et al. 2013

MSA

View full text Add to dashboard Cite

The fabrication of nano porous silicon, nPSi, using alkali etching process has been studied and carried out. The surface chemistry of anisotropic etching of n-type Si-wafer is reviewed and the anisotropic chemical etching of silicon in alkaline solution using wetting agents is discussed. Transformation of crystallographic plane of n-Si (211) to nPSi (100) has occurred on using n-propanol as wetting agent. The rate of pore formation was 0.02478 -0.02827 µm/min, which was heavily dependent upon the concentration of the etchant containing wetting agents, allowing patterned porous silicon formation through selective doping of the substrate. A particle size of 15 nm for porous nano-silicon was calculated from the XRD data. Porosity of PS layers is about 10%. Pore diameter and porous layer thickness are 0.0614 nm and 16 µm, respectively. The energy gap of the produced porous silicon is 3.3 eV. Furthermore, the combination of PS with Congo Red, which are nanostructured due to their deposition within the porous matrix is discussed. Such nano compounds offer broad avenue of new and interesting properties depending on the involved materials as well as on their morphology. Chemical route was utilized as the host material to achieve pores filling. They were impregnated with Congo Red, which gave good results for the porous silicon as a promising pH sensor.

show abstract

Section: Pore Shapementioning

confidence: 99%

Fabrication of Congo Red/Oxidized Porous Silicon (CR/OPS) pH-Sensors

Kashyout¹,

Soliman²,

Nabil³

et al. 2013

MSA

View full text Add to dashboard Cite

show abstract

“…The azobenzene derivatives which exhibit photoisomerization from the thermodynamically more stable trans isomer to the cis isomer (and vice versa) by irradiation with UV or visible light were extensively studied for their photochemical properties in solution [1,14] and therefore for their ability to produce photochemical devices [16][17][18]. Birefringence, resulting from the alignment of azobenzene groups, was also investigated [18] as well as the linear and non-linear optical properties of the derivatives [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Vibrational analysis of [4-[(E)-phenylazo] phenyl]ethanol based on the comparison between the experimental and DFT calculated Raman spectra

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Such gas sensors may be based on pH sensitive dyes [4][5][6][7] or polymers [8], where the detection is based on the color change of the material when in contact with ammonia. Immobilization of sensitive dyes onto porous silicon for ammonia detection has been studied [9][10][11] due to its high surface area and easy fabrication. One of the major drawbacks of dye-based ammonia sensors is their sensitivity towards other gases, such as air humidity, which affects their performance [7,12,13].…”

Section: Introductionmentioning

confidence: 99%