Humidity sensitivity of polypyrrole and polypyrrole/SBA‐15 host–guest composite materials

Geng, Wangchang; Li, Xiaotian; Li, Nan; Zhang, Tong; Wang, Wei; Qiu, Shilun

doi:10.1002/app.24769

Cited by 24 publications

(13 citation statements)

References 17 publications

(20 reference statements)

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“…The Brunauer-EmmettTeller surface area and pore volume decreased greatly compared to that of pure SBA-15. 21 These results confirm the successful encapsulation of NiO/ PPy into SBA-15. Figure 5 shows the differential thermal analysis (DTA) and thermogravimetric analysis (TGA) curves of NiO-PPy/SBA-15.…”

supporting

confidence: 87%

Direct‐current and alternating‐current analysis of the humidity‐sensing properties of nickel oxide doped polypyrrole encapsulated in mesoporous silica SBA‐15

Wang

Zhang

et al. 2009

J of Applied Polymer Sci

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Nickel oxide (NiO) doped polypyrrole (PPy) was encapsulated in mesoporous SBA-15. All of the synthesized samples were characterized by infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. They were investigated as humidity-sensor materials at room temperature. The sensor showed excellent humidity sensitivity in the relative humidity range 11-95%. The humidity-sensing properties were very much improved by encapsulation of the NiO-doped PPy into mesoporous silica SBA-15. Finally, the sensitivity mechanism was investigated by direct-current (dc) and alternating-current (ac) analysis. The dc circuit with the instantaneous polarity reversion method was designed by us to study the dc response in different humidity environments. The conductive mechanism was established through the dc and ac investigation, and the conductive particles were identified as ions and electrons.

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supporting

confidence: 87%

Direct‐current and alternating‐current analysis of the humidity‐sensing properties of nickel oxide doped polypyrrole encapsulated in mesoporous silica SBA‐15

Wang

Zhang

et al. 2009

J of Applied Polymer Sci

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“…Table shows comparison of the humidity sensing properties of Mn/SBA‐15 nanocomposites with other hybrid SBA‐15 materials . It is found that our material possess very high surface area and pore volume due to one step synthesis strategy involved in the preparation of nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

“…Table II shows comparison of the humidity sensing properties of Mn/SBA-15 nanocomposites with other hybrid SBA-15 materials. [38][39][40][41][42] It is found that our material possess very high surface area and pore volume due to one step synthesis strategy involved in the preparation of nanocomposite. The comparatively enhanced mesoporous properties create abundant pore opportunities for free movement of charged ions, thus causing more than five order of magnitude changes in resistance together with negligible hysteresis in the 11%-92% RH range.…”

Section: March 2015mentioning

confidence: 93%

Mn‐Loaded Mesoporous Silica Nanocomposite: A Highly Efficient Humidity Sensor

Tomer¹,

Duhan²,

Adhyapak

et al. 2014

J. Am. Ceram. Soc.

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We report a relative humidity sensor based on manganese‐nanoparticle‐loaded mesoporous silica SBA‐15 using a facile hydrothermal route. The as‐developed nanocomposite material (Mn/SBA‐15) possesses a high surface area and a high pore volume. The obtained samples were characterized by using low‐angle X‐ray Diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), N2 adsorption–desorption, high‐resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and energy‐dispersive X‐ray (EDX) spectroscopy techniques. The Mn/SBA‐15 exhibited, improved humidity response and recovery time as compared to pure SBA‐15 in the 11%–92% RH range. Optimal results were obtained for the 5 wt% Mn‐loaded SBA‐15 sample, which displayed excellent linearity, low hysteresis, and high humidity response. A change in ~5 orders of magnitude in resistance was observed over 11%–92% RH range. The investigation of humidity sensing properties of Mn/SBA‐15 nanocomposite shows that this material has good prospects as humidity sensor.

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“…Modification of mesoporous SBA-15 using polypyrrole (PPY) demonstrated this impact as well. When compared to the SBA-15 material, the SBA-15/PPY composite showed a response over a larger range of RH values [34]. Modification of the SBA-15 material using hydrophilic Li + resulted in an impendence change over three orders of magnitude, considerably greater than that of the undoped SBA-15.…”

Section: Sensors For Relative Humiditymentioning

confidence: 99%

Mesoporous Silicate Materials in Sensing

Melde

Johnson

Charles

2008

Sensors

236

115

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Mesoporous silicas, especially those exhibiting ordered pore systems and uniform pore diameters, have shown great potential for sensing applications in recent years. Morphological control grants them versatility in the method of deployment whether as bulk powders, monoliths, thin films, or embedded in coatings. High surface areas and pore sizes greater than 2 nm make them effective as adsorbent coatings for humidity sensors. The pore networks also provide the potential for immobilization of enzymes within the materials. Functionalization of materials by silane grafting or through co-condensation of silicate precursors can be used to provide mesoporous materials with a variety of fluorescent probes as well as surface properties that aid in selective detection of specific analytes. This review will illustrate how mesoporous silicas have been applied to sensing changes in relative humidity, changes in pH, metal cations, toxic industrial compounds, volatile organic compounds, small molecules and ions, nitroenergetic compounds, and biologically relevant molecules.

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Humidity sensitivity of polypyrrole and polypyrrole/SBA‐15 host–guest composite materials

Cited by 24 publications

References 17 publications

Direct‐current and alternating‐current analysis of the humidity‐sensing properties of nickel oxide doped polypyrrole encapsulated in mesoporous silica SBA‐15

Direct‐current and alternating‐current analysis of the humidity‐sensing properties of nickel oxide doped polypyrrole encapsulated in mesoporous silica SBA‐15

Mn‐Loaded Mesoporous Silica Nanocomposite: A Highly Efficient Humidity Sensor

Mesoporous Silicate Materials in Sensing

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