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Gas sensing of SnO2 nanocrystals revisited: developing ultra-sensitive sensors for detecting the H2S leakage of biogas.

Mei L, Chen Y, Ma J - Sci Rep (2014)

Bottom Line: As a typical mode of energy from waste, biogas technology is of great interest to researchers.The sensitivity of as-obtained SnO2 sensor towards 5 ppm H2S can reach up to 357.Such a technique based on SnO2 nanocrystals opens up a promising avenue for future practical applications in real-time monitoring a trace of H2S from the leakage of biogas.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, P. R. China.

ABSTRACT
As a typical mode of energy from waste, biogas technology is of great interest to researchers. To detect the trace H2S released from biogas, we herein demonstrate a high-performance sensor based on highly H2S-sensitive SnO2 nanocrystals, which have been selectively prepared by solvothermal methods using benzimidazole as a mineralization agent. The sensitivity of as-obtained SnO2 sensor towards 5 ppm H2S can reach up to 357. Such a technique based on SnO2 nanocrystals opens up a promising avenue for future practical applications in real-time monitoring a trace of H2S from the leakage of biogas.

No MeSH data available.


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(a) N2 isotherm adsorption-desorption curves and (b) the pore-size distribution of SNC1, SNC2 and SNC3.
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f4: (a) N2 isotherm adsorption-desorption curves and (b) the pore-size distribution of SNC1, SNC2 and SNC3.

Mentions: Nitrogen isotherm adsorption-desorption curves together with the pore size distributions of these as-synthesized SnO2 nanocrystals are given in Figure 4. In Figure 4a, SNC1 shows a typical type-IV isotherm with H2-type hysteresis loop43. Base on the Barrett-Joyner-Halenda (BJH) equation, the main pore size (Figure 4b) for SNC1 is determined as 3.8 nm, which further confirms a uniform pore size distribution. The BET specific surface area (SBET) for SNC1 is 223.6 m2·g−1. The higher SBET of the adsorption-desorption curve shows that SNC1 has the larger inter particle distanceand homogenized sizes. SNC2 and SNC3 exhibit a type IV isotherm with H2-type hysteresis loopas shown in Figure 4a. The high SBET of SNC2 (181.2 m2·g−1) shows the large interparticle distanceas revealed in Figure 2d. The smaller hysteresis loop and the SBET of SNC3 (109.7 m2·g−1) is probably a result of the severe aggregation in the sample. These results further indicate that it is effective to tailor the aggregated structure of SnO2 nanocrystalswith ahigh SBET by simply changing the amount of benzimidazole.


Gas sensing of SnO2 nanocrystals revisited: developing ultra-sensitive sensors for detecting the H2S leakage of biogas.

Mei L, Chen Y, Ma J - Sci Rep (2014)

(a) N2 isotherm adsorption-desorption curves and (b) the pore-size distribution of SNC1, SNC2 and SNC3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4129425&req=5

f4: (a) N2 isotherm adsorption-desorption curves and (b) the pore-size distribution of SNC1, SNC2 and SNC3.
Mentions: Nitrogen isotherm adsorption-desorption curves together with the pore size distributions of these as-synthesized SnO2 nanocrystals are given in Figure 4. In Figure 4a, SNC1 shows a typical type-IV isotherm with H2-type hysteresis loop43. Base on the Barrett-Joyner-Halenda (BJH) equation, the main pore size (Figure 4b) for SNC1 is determined as 3.8 nm, which further confirms a uniform pore size distribution. The BET specific surface area (SBET) for SNC1 is 223.6 m2·g−1. The higher SBET of the adsorption-desorption curve shows that SNC1 has the larger inter particle distanceand homogenized sizes. SNC2 and SNC3 exhibit a type IV isotherm with H2-type hysteresis loopas shown in Figure 4a. The high SBET of SNC2 (181.2 m2·g−1) shows the large interparticle distanceas revealed in Figure 2d. The smaller hysteresis loop and the SBET of SNC3 (109.7 m2·g−1) is probably a result of the severe aggregation in the sample. These results further indicate that it is effective to tailor the aggregated structure of SnO2 nanocrystalswith ahigh SBET by simply changing the amount of benzimidazole.

Bottom Line: As a typical mode of energy from waste, biogas technology is of great interest to researchers.The sensitivity of as-obtained SnO2 sensor towards 5 ppm H2S can reach up to 357.Such a technique based on SnO2 nanocrystals opens up a promising avenue for future practical applications in real-time monitoring a trace of H2S from the leakage of biogas.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, P. R. China.

ABSTRACT
As a typical mode of energy from waste, biogas technology is of great interest to researchers. To detect the trace H2S released from biogas, we herein demonstrate a high-performance sensor based on highly H2S-sensitive SnO2 nanocrystals, which have been selectively prepared by solvothermal methods using benzimidazole as a mineralization agent. The sensitivity of as-obtained SnO2 sensor towards 5 ppm H2S can reach up to 357. Such a technique based on SnO2 nanocrystals opens up a promising avenue for future practical applications in real-time monitoring a trace of H2S from the leakage of biogas.

No MeSH data available.


Related in: MedlinePlus