Silicon Nanowire Array Sensor for Highly Sensitive and Selective Detection of Nerve Agent Simulant Vapor via Surface Hydroxyl Groups

In this paper, we present a highly sensitive and selective detection of serum carcinoembryonic antigen (CEA) based on silicon nanowire (SiNW) array device. With the help of traditional microfabrication technology, low-cost and highly controllable SiNW array devices were fabricated. After a series of surface modification processes, SiNW array biosensors show rapid and reliable response to CEA; the detection limit of serum CEA was 10 fg/mL, the current signal is linear with the logarithm of serum CEA concentration in the range of 10 fg/mL to 100 pg/mL. In this work, SiNW array biosensors can obtain strong signal and high signal-to-noise ratio; these advantages can reduce the production cost of the SiNW-based system and promote the application of SiNWs in the field of tumor marker detection.

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Interior surface hydroxyl groups in ordered mesoporous silicates

Solid State Ionics ◽

10.1016/s0167-2738(97)00189-6 ◽

1997 ◽

Vol 101-103 (1-2) ◽

pp. 271-277 ◽

Cited By ~ 60

Author(s):

H Landmesser

Keyword(s):

Hydroxyl Groups ◽

Mesoporous Silicates ◽

Interior Surface ◽

Surface Hydroxyl ◽

Surface Hydroxyl Groups ◽

Ordered Mesoporous

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The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19861430 ◽

1986 ◽

Vol 51 (7) ◽

pp. 1430-1438 ◽

Cited By ~ 6

Author(s):

Alena Reissová ◽

Zdeněk Bastl ◽

Martin Čapka

Keyword(s):

Free Surface ◽

Hydroxyl Groups ◽

Titanium Complex ◽

Surface Hydroxyl ◽

Surface Hydroxyl Groups ◽

Free Hydroxyl ◽

Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

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Advantageous Role of Ir0 Supported on TiO2 Nanosheets in Photocatalytic CO2 Reduction to CH4: Fast Electron Transfer and Rich Surface Hydroxyl Groups

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c19233 ◽

2021 ◽

Vol 13 (5) ◽

pp. 6219-6228

Author(s):

Kunlin Tang ◽

Zhiqiang Wang ◽

Weixin Zou ◽

Hongyu Guo ◽

Yuchao Wu ◽

...

Keyword(s):

Electron Transfer ◽

Fast Electron ◽

Co2 Reduction ◽

Hydroxyl Groups ◽

Surface Hydroxyl ◽

Surface Hydroxyl Groups ◽

Tio2 Nanosheets

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Reusable Surface-Enhanced Raman Spectroscopy Substrates Made of Silicon Nanowire Array Coated with Silver Nanoparticles Fabricated by Metal-Assisted Chemical Etching and Photonic Reduction

Nanomaterials ◽

10.3390/nano9111531 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1531 ◽

Cited By ~ 2

Author(s):

Shi Bai ◽

Yongjun Du ◽

Chunyan Wang ◽

Jian Wu ◽

Koji Sugioka

Keyword(s):

Silver Nanoparticles ◽

Chemical Etching ◽

Silicon Nanowire ◽

Nanowire Array ◽

Surface Enhanced Raman Spectroscopy ◽

Sers Substrate ◽

Silicon Nanowire Array ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Metal Assisted Chemical Etching

Surface-enhanced Raman spectroscopy (SERS) has advanced over the last four decades and has become an attractive tool for highly sensitive analysis in fields such as medicine and environmental monitoring. Recently, there has been an urgent demand for reusable and long-lived SERS substrates as a means of reducing the costs associated with this technique To this end, we fabricated a SERS substrate comprising a silicon nanowire array coated with silver nanoparticles, using metal-assisted chemical etching followed by photonic reduction. The morphology and growth mechanism of the SERS substrate were carefully examined and the performance of the fabricated SERS substrate was tested using rhodamine 6G and dopamine hydrochloride. The data show that this new substrate provides an enhancement factor of nearly 1 × 108. This work demonstrates that a silicon nanowire array coated with silver nanoparticles is sensitive and sufficiently robust to allow repeated reuse. These results suggest that this newly developed technique could allow SERS to be used in many commercial applications.

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