Syndiotactic polystyrene thin film as sensitive layer for an optoelectronic chemical sensing device

Giordano, M.; Russo, M.; Cusano, A.; Mensitieri, Giuseppe; Guerra, Gaetano

doi:10.1016/j.snb.2004.02.053

Cited by 73 publications

(45 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It presents two identical cavities and eight styrene monomeric units per unit cell [16] and rapidly and selectively absorbs low-molecular-mass guest molecules even at very low activities, producing clathrate [28][29][30][31][32][33] and intercalate [34][35][36][37] co-crystals. Several recent studies have shown that the d crystalline phase is promising for applications in chemical separations [38][39][40][41] and air/water purification [42][43][44][45][46][47][48][49][50] as well as in sensorics [51][52][53][54][55][56]. It has been also found that the self-assembling of this polymeric framework and active guest molecules into co-crystals reduce guest diffusivity and prevent guest self-aggregation (without recurring to chemical reactions).…”

Section: Introductionmentioning

confidence: 97%

Understanding at molecular level of nanoporous and co-crystalline materials based on syndiotactic polystyrene

Milano

Guerra

2009

Progress in Materials Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 97%

Understanding at molecular level of nanoporous and co-crystalline materials based on syndiotactic polystyrene

Milano

Guerra

2009

Progress in Materials Science

View full text Add to dashboard Cite

“…In this configuration, any effect able to modify the refractive index of the sensing layer will lead to a change in the normalized output of the optical sensor. 17 The cadmium arachidate (CdA), prepared by the Langmuir-Blodgett technique, has been used as multilayered buffer material onto acoustic and optical sensors to promote the adhesion of the single-walled carbon nanotubes as sensing overlayer onto sensors. The CdA has been chosen as a linker-buffer material with hydrophobic surface characteristics, whose know-how of the LB deposition process has already been developed by the authors.…”

mentioning

confidence: 99%

Alcohol detection using carbon nanotubes acoustic and optical sensors

Penza

Cassano

Aversa

et al. 2004

Applied Physics Letters

Self Cite

131

View full text Add to dashboard Cite

We demonstrate the integration of single-walled carbon nanotubes (SWCNTs) onto quartz crystal microbalance (QCM) and standard silica optical fiber (SOF) sensor for alcohol detection at room temperature. Different transducing mechanisms have been used in order to outline the sensing properties of this class of nanomaterials, in particular the attention has been focused on two key parameters in sensing applications: mass and refractive index changes due to gas absorption. Here, Langmuir–Blodgett (LB) films consisting of tangled bundles of SWCNTs without surfactant molecules have been successfully transferred onto QCM and SOF. Mass-sensitive 10MHz QCM SWCNTs sensor exhibited a resonant frequency decreasing upon tested alcohols exposure; also the normalized optoelectronic signal (λ=1310nm) of the refractive index-sensitive SOF SWCNTs sensor was found to decrease upon alcohols ambient. Highly sensitive, repeatable and reversible responses of the QCM and SOF SWCNTs sensors indicate that the detection, at room temperature, in a wide mmHg vapor pressures range of alcohols and potentially other volatile organic compounds is feasible.

show abstract

“…[4][5][6] This means that the thickness ratio matches the square root of the response time ratio. In our case, with d I Ϸ 160 nm, d II Ϸ 260 nm, I = 21 min, and II = 62 min, we obtain 0.615 for thickness ratio side and 0.586 for the sqaure root of the response time ratio, demonstrating good agreement with the data previously reported.…”

Section: Giordanomentioning

confidence: 93%

“…3 The potentiality of sPS as highly sensitive and specific material has been recently demonstrated. [4][5][6] The sPS in the semicrystalline ␦ form is characterized by a nanoporous crystalline phase with a regularly spaced array of nanocavities of well-defined size and shape. As a matter of fact, penetrant molecules can be hosted with a certain selectivity based on both size exclusion and host guest interactions, and exhibits high sorption capability and an improved selectivity toward low molecular weight organic substances, mainly chlorinated and aromatic.…”

Section: Giordanomentioning

confidence: 99%

High-sensitivity optical chemosensor based on coated long-period gratings for sub-ppm chemical detection in water

Cusano

Pilla

Contessa

et al. 2005

Applied Physics Letters

Self Cite

104

View full text Add to dashboard Cite

In this work, the use of fiber long-period gratings (LPGs)—coated with nanoscale overlays of Syndiotactic Polystyrene (sPS) in the nanoporous crystalline δ form as specific and highly sensitive chemical sensors for in water monitoring—is proposed. The approach presented here, combines the excellent sorption properties of δ form sPS as a chemosensitive layer with the excellent refractive index sensitivity of LPG-based sensors as ideal transducers. In particular, when overlays with a high refractive index compared with the cladding one are deposited along the grating region, as in this case, the refraction-reflection regime at the cladding-overlay interface occurs. As result of this mechanism, the attenuation bands of coated LPGs would respond to the optical changes induced in the sensitive overlay due to chemical sorption by a significant modification of the peak central wavelength and intensity. The sensitivity depends strongly on the overlay thickness and the grating coupled cladding mode. Here, sensor probes were prepared by using a dip coating technique and a proprietary procedure to obtain the δ form sPS. An experimental demonstration of the sensor capability to perform sub-ppm detection of chloroform in water at room temperature is reported here. Also, the effects of the overlay thickness and the cladding mode order on sensor sensitivity and response time have been numerically and experimentally investigated.

show abstract

Syndiotactic polystyrene thin film as sensitive layer for an optoelectronic chemical sensing device

Cited by 73 publications

References 10 publications

Understanding at molecular level of nanoporous and co-crystalline materials based on syndiotactic polystyrene

Understanding at molecular level of nanoporous and co-crystalline materials based on syndiotactic polystyrene

Alcohol detection using carbon nanotubes acoustic and optical sensors

High-sensitivity optical chemosensor based on coated long-period gratings for sub-ppm chemical detection in water

Contact Info

Product

Resources

About