Dual functionalization of aligned silicon nanowires by APTES and nano-Ag to achieve high response to rarefied acetone at high ambient humidity

Qin, Yuxiang; Zang, Junsheng; Bai, Chenxiang; Wang, Xin-Yang

doi:10.1007/s10854-020-04868-5

Cited by 8 publications

(8 citation statements)

References 49 publications

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“…The weak peaks around 2850 and 2927 cm −1 can be ascribed to -CH of the ≡Si-(CH 2 ) 3 -NH 2 in APTES, or incompletely hydrolysed ≡SiOC 2 H 5 in TEOS [31]. For APTES-pretreated specimen, the significant peak around 1020 cm −1 corresponds to the stretching of Si-O-Si in the silane film [30,32,33]. The strong peaks at 1472 and 1556 cm −1 are assigned to the vibration of –NH 2 groups [31,34], whereas that at 1630 cm −1 is related to the silanol groups (≡Si-OH).…”

Section: Resultsmentioning

confidence: 99%

Influence of 3-aminopropyltriethoxysilane/tetraethylorthosilicate mixture pretreatment on the microstructure and corrosion resistance of zeolite coating

Chen

2023

Surface Engineering

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The influence of silane pretreatment with five different volume ratios (100/0, 75/25, 50/50, 25/ 75, and 0/100) of 3-aminopropyltriethoxysilane (APTES)/tetraethylorthosilicate (TEOS) on microstructure and corrosion resistance of the hydrothermal synthesized zeolite coatings on the H13 steel substrates was investigated. The surface of the zeolite coatings on the 100/0, 75/25, and 50/50 mixture of the APTES/TEOS pretreated substrates was composed of intergrown rectangular particles. Additionally, pores were observed. A 25/75 mixture of APTES/TEOS pretreatment smoothed the edges and angles of zeolite particles with gel-like materials filled in the pores. In pure TEOS pretreatment, microcracks, and much gel-like materials were observed on the zeolite coating. The electrochemical test revealed that the zeolite coating on a 50/50 mixture of the APTES/TEOS pretreated substrate exhibited the highest corrosion resistance in 3.5 wt-% NaCl solution. This was because a 50/50 mixture of APTES/TEOS pretreatment advantageously promoted development of a dense and thick gel layer, which enhanced the intergrowth of zeolite particles.

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Section: Resultsmentioning

confidence: 99%

Influence of 3-aminopropyltriethoxysilane/tetraethylorthosilicate mixture pretreatment on the microstructure and corrosion resistance of zeolite coating

Chen

2023

Surface Engineering

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“…Since the gas measurements were at ambient conditions, the carbonyl group of acetone was more likely to physisorb to the amine‐terminated group of APTES due to dipole‐dipole interactions. [ 23 ] An additional vibrational frequency band (3350 nm) was chosen to explore the correlation between our home‐built MIR setup data versus the National Institute of Standards and Technology (NIST) Fourier‐transform infrared spectroscopy (FITR) data (tracking the yellow bars for acetone vapors data). Figure 4A,B, shows that our absorbance results followed the general trend established by NIST FITR data.…”

Section: Resultsmentioning

confidence: 99%

“…Further, for the surface modification of the deposited MSN coatings, a hydrophilic amine‐terminated silane, (3‐aminopropyl) triethoxysilane (APTES), and a hydrophobic alkyl‐terminated silane, triethoxy(octyl)silane (TEOOS), were chosen among a broad chemistry of silanes that can be matched with the target analytes. Self‐assembled monolayers of APTES and TEOOS can selectively adsorb acetone vapors via dipole‐dipole interactions, [ 23 ] and hydrocarbon molecules via hydrophobic and London dispersion forces, [ 24 ] respectively. However, their use has never been explored for advancing MIR detection.…”

Section: Introductionmentioning

confidence: 99%

Silane‐Modified Mesoporous Silica Nanocoatings for Selective Mid‐Infrared Waveguide‐Based Gas Sensing

Husseini

Zhou

et al. 2022

Adv Materials Inter

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This paper reports the use of silane monolayers of different polarities to enable recognition and selective interfacial enrichment of nonpolar versus polar gases for spectroscopic mid‐infrared (MIR) on‐chip sensing. However, detection of gases using on‐chip waveguides (WGs) is challenging because of the low concentrations of gas molecules within the evanescent field surrounding the WGs. To solve this issue, high‐surface‐area, precisely‐controlled‐thickness nanocoatings are introduced whose surface modification with strategically selected silanes enables control of preferential adsorption and concentration of polar versus nonpolar gas analytes. Conformal nanocoatings are constructed using layer‐by‐layer deposition of mesoporous silica nanoparticles (MSNs) at substrate withdrawal speeds controlled within the capillary regime. Surface modification of the WG‐immobilized MSNs with hydrophobic triethoxy(octyl)silane enables, for the first time, enhanced sensitivity and selectivity towards nonpolar methane gas as compared to its polar counterpart acetone. On the other hand, modification of the nanocoatings with (3‐aminopropyl)triethoxysilane leads to preferential binding of polar acetone vapors. This work demonstrates the capability of interfacial modification for controlling the selection and enhancement of the spectroscopic features of gas analytes with different polarities. The developed interfacial assemblies can enable diverse spectroscopic gas sensing platforms for applications in health diagnostics, environmental monitoring, and process control.

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“…The excellent humidity independence after Ru loading originated from the increased surface-adsorbed oxygen species and catalytic effects on the gas reaction. Qin et al [64] utilized Ag nanoparticles to decorate silicon nanowire arrays for high response to trace acetone at high ambient humidity. The DFT calculations revealed that the nano-Ag loaded on the surface of Si nanowires served as wet centers, attracting surrounding water vapor molecules preferentially and thus protecting the reaction sites on Si nanowires for acetone sensing.…”

Section: Functionalization Of Noble Metalsmentioning

confidence: 99%

“…(VI) Almost all the previous reports in this review only utilized a single strategy to improve the humidity resistance of gas sensors. Resembling co-doping hydrophobic APTES and Ag nanoparticles to achieve the stable acetone sensing of Si nanowires [64], a combination of two or more anti-humidity methods probably further promotes the humidity tolerance of gas sensors.…”

Section: Challenges and Perspectivesmentioning

confidence: 99%

Recent Progress on Anti-Humidity Strategies of Chemiresistive Gas Sensors

Wang

Zhou

2022

Materials

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In recent decades, chemiresistive gas sensors (CGS) have been widely studied due to their unique advantages of expedient miniaturization, simple fabrication, easy operation, and low cost. As one ubiquitous interference factor, humidity dramatically affects the performance of CGS, which has been neglected for a long time. With the rapid development of technologies based on gas sensors, including the internet of things (IoT), healthcare, environment monitoring, and food quality assessing, the humidity interference on gas sensors has been attracting increasing attention. Inspiringly, various anti-humidity strategies have been proposed to alleviate the humidity interference in this field; however, comprehensive summaries of these strategies are rarely reported. Therefore, this review aims to summarize the latest research advances on humidity-independent CGS. First, we discussed the humidity interference mechanism on gas sensors. Then, the anti-humidity strategies mainly including surface engineering, physical isolation, working parameters modulation, humidity compensation, and developing novel gas-sensing materials were successively introduced in detail. Finally, challenges and perspectives of improving the humidity tolerance of gas sensors were proposed for future research.

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Dual functionalization of aligned silicon nanowires by APTES and nano-Ag to achieve high response to rarefied acetone at high ambient humidity

Cited by 8 publications

References 49 publications

Influence of 3-aminopropyltriethoxysilane/tetraethylorthosilicate mixture pretreatment on the microstructure and corrosion resistance of zeolite coating

Influence of 3-aminopropyltriethoxysilane/tetraethylorthosilicate mixture pretreatment on the microstructure and corrosion resistance of zeolite coating

Silane‐Modified Mesoporous Silica Nanocoatings for Selective Mid‐Infrared Waveguide‐Based Gas Sensing

Recent Progress on Anti-Humidity Strategies of Chemiresistive Gas Sensors

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