Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure

Yang, Zhenxing; Hu, Kuo; Meng, Xianghe; Tang, Qiang; Dong, Jiajun; Liu, Bo; Lu, Qian; Zhang, Hua; Sundqvist, Bertil; Zhu, Pinwen; Yao, Mingguang; Liu, Bing Bing

doi:10.1016/j.carbon.2017.12.115

Cited by 40 publications

(24 citation statements)

References 65 publications

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“…Consistently to literature data, [32,43] two diffraction peaks at ca. 13 • (210 plane) and 27 • (002 plane) are found for CN, which are attributed to the in-plane packing and inter-planar stacking of conjugated aromatic ring, respectively.…”

Section: Xrd Characterizationsupporting

confidence: 91%

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Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

et al. 2020

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Earth-abundant Mn-based oxide nanoparticles are supported on carbon nitride using two different immobilization methods and tested for the oxygen reduction reaction. Compared to the metal free CN, the immobilization of Mn oxide enhances not only the electrocatalytic activity but also the selectivity towards the 4e- reduction reaction of O2 to H2O. The XPS analysis reveals the interaction of the pyridine N species with Mn3O4 nanoparticles being particularly beneficial. This interaction is realized—although to a limited extent—when preparing the catalysts via impregnation; via the oleic acid route it is not observed. Whilst this work shows the potential of these systems to catalyze the ORR, the main limiting factor is still the poor conductivity of the support which leads to overpotential.

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Section: Xrd Characterizationsupporting

confidence: 91%

“…For treated CN, the UV-vis reflectance spectrum in Figure 7a shows the absorption edge around 488 nm, which is close to values which have previously been reported for carbon nitride [43]. The variation in light absorption with preparation route and treatment temperature is significant.…”

Section: Uv-vis Spectroscopysupporting

confidence: 87%

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

et al. 2020

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“…C 1s spectra yield peaks at 284.6, 286.8, and 288.4 eV; these can be ascribed to C–C, C–O, and C=O for the GO counterpart in the composite ( Figure 7 b). 39 It is evident that, except for the C–C peak, the other two oxygen-containing peaks have relatively low intensities, which indicate the successful hydrothermal reduction of GO, as had already been established by the Raman spectral analysis. Similarly, the N 1s spectrum in Figure 7 d has one peak at 398.1 eV.…”

Section: Results and Discussionmentioning

confidence: 54%

“…Surprisingly, the band gaps were remarkably decreased to 1.25 eV in LCMGP after combining with PPy. Valence band (VB) and conduction band (CB) potentials of all samples were calculated using the following equations: 39 …”

Section: Results and Discussionmentioning

confidence: 99%

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo₂O₁₁–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

Fatema

Liu

et al. 2020

ACS Omega

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In this study, we demonstrate the fabrication and characterization of a new quaternary semiconductor nanocomposite of LiCuMo 2 O 11 /graphene oxide/polypyrrole (LCMGP) via a hydrothermal method and testing of an NH 3 and H 2 SO 4 sensor operating in gaseous states at room temperature. We used X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy to characterize the properties of LCMGP nanostructures. Our sensor is capable of detecting NH 3 and H 2 SO 4 and quantifying their concentration in the gas flow. These results have been confirmed by exposing the sensor to different concentrations of NH 3 and H 2 SO 4 (100–1000 ppm). The obtained results confirm the exceptional sensing properties of the graphene–polymer-combined quaternary semiconductor nanocomposite related to the oxidation–reduction process that can be used for detection, identification, and quantification purposes.

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“…DRS data recorded for IGS and ZAGS structures were changed over to absorption spectra by the Kubelka–Munk (K–M) theory. Their respective band gaps (E g ) were evaluated using the following equation 35 where α is the molar absorption coefficient determined as α = (1 – R ) 2 /2 R , h v is the incident light frequency, A is the proportionality constant, and E g is the band gap of the material. Table 1 illustrates the data from (α h v) 1/2 as a function of photon energy.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Electrochemical Biosensors Based on Highly Efficient Mesoporous ZrO₂-Ag-G-SiO₂ and In₂O₃-G-SiO₂ for Rapid Recognition of E. coli O157:H7

et al. 2020

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Here, we reported an innovative and electrochemical biosensor for the rapid detection of Escherichia coli O157:H 7. We fabricated the mesoporous ZrO 2 -Ag-G-SiO 2 (ZAGS) and In 2 O 3 -G-SiO 2 (IGS) sensors, and cyclic voltammetry (CV) was employed to detect the bacteria. The development of these portable sensors addresses the challenges of conventional time-consuming and more expensive laboratory-based analyses. Hence, the biosensors were highly selective to detect E. coli . The sensor could recognize an individual E. coli cell in 1 μL of sample volume within 30 s. E. coli live cells tied down on sample nanoparticles worked toward the definite acquirement of E. coli . The high thickness of negative charge on the surface of E. coli cells effectively regulated the concentration of dominant part charge carriers in the mesoporous channel, allowing a continuous check of E. coli concentration in a known sample. The signal current decreased linearly, while the E. coli concentration increased from 1.0 × 10 1 to 1.0 × 10 10 CFU/mL. ZAGS and IGS biosensors could detect E. coli in the range from 10 1 to 10 10 CFU/mL. ZAGS and IGS biosensors in this investigation showed great specificity, reproducibility, stability, and selectivity and are expected to have a great impact on applications in the detection of foodborne pathogens.

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Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure

Cited by 40 publications

References 65 publications

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo₂O₁₁–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

Comparative Study of Electrochemical Biosensors Based on Highly Efficient Mesoporous ZrO₂-Ag-G-SiO₂ and In₂O₃-G-SiO₂ for Rapid Recognition of E. coli O157:H7

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Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure

Cited by 40 publications

References 65 publications

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo2O11–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

Comparative Study of Electrochemical Biosensors Based on Highly Efficient Mesoporous ZrO2-Ag-G-SiO2 and In2O3-G-SiO2 for Rapid Recognition of E. coli O157:H7

Contact Info

Product

Resources

About

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo₂O₁₁–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

Comparative Study of Electrochemical Biosensors Based on Highly Efficient Mesoporous ZrO₂-Ag-G-SiO₂ and In₂O₃-G-SiO₂ for Rapid Recognition of E. coli O157:H7