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Enhanced NH3-Sensitivity of Reduced Graphene Oxide Modified by Tetra-α-Iso-Pentyloxymetallophthalocyanine Derivatives.

Li X, Wang B, Wang X, Zhou X, Chen Z, He C, Yu Z, Wu Y - Nanoscale Res Lett (2015)

Bottom Line: Three kinds of novel hybrid materials were prepared by noncovalent functionalized reduced graphene oxide (rGO) with tetra-α-iso-pentyloxyphthalocyanine copper (CuPc), tetra-α-iso-pentyloxyphthalocyanine nickel (NiPc) and tetra-α-iso-pentyloxyphthalocyanine lead (PbPc) and characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), Raman spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and atomic force microscope (AFM).The as-synthesized MPc/rGO hybrids show excellent NH3 gas-sensing performance with high response value and fast recovery time compared with bare rGO.The enhancement of the sensing response is mainly attributed to the synergism of gas adsorption of MPc to NH3 gas and conducting network of rGO with greater electron transfer efficiency.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China. wangbin@hlju.edu.cn.

ABSTRACT
Three kinds of novel hybrid materials were prepared by noncovalent functionalized reduced graphene oxide (rGO) with tetra-α-iso-pentyloxyphthalocyanine copper (CuPc), tetra-α-iso-pentyloxyphthalocyanine nickel (NiPc) and tetra-α-iso-pentyloxyphthalocyanine lead (PbPc) and characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), Raman spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and atomic force microscope (AFM). The as-synthesized MPc/rGO hybrids show excellent NH3 gas-sensing performance with high response value and fast recovery time compared with bare rGO. The enhancement of the sensing response is mainly attributed to the synergism of gas adsorption of MPc to NH3 gas and conducting network of rGO with greater electron transfer efficiency. Strategies for combining the good properties of rGO and MPc derivatives will open new opportunities for preparing and designing highly efficient rGO chemiresistive gas-sensing hybrid materials for potential applications in gas sensor field.

No MeSH data available.


Related in: MedlinePlus

Raman spectra of MPc, rGO, CuPc/rGO, NiPc/rGO, and PbPc/rGO hybrids
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Fig5: Raman spectra of MPc, rGO, CuPc/rGO, NiPc/rGO, and PbPc/rGO hybrids

Mentions: The noncovalent adsorption and electron transfer interaction can be also confirmed by Raman spectroscopy. The Raman spectra of MPc, rGO, and MPc/rGO hybrids were shown in Fig. 5. For the rGO sample, the D bands and G bands peaks of rGO could be observed in Fig. 5. The G band at 1588 cm−1 is due to the E2g vibrational mode [4] and the D band at 1366 cm−1 is a breathing mode [12] of k-point phonons of A1g symmetry. As to the MPc/rGO hybrids, the D bands and G bands were also clearly observed, but a large decrease in the intensity, and the D/G intensity ratios of MPc/rGO (0.863) were same as the D/G intensity ratios of rGO (0.862). Guldi pointed out that the changes of the intensity ratio about the D band to the G band can explain the covalent modification of graphene [21]. So the D/G intensity ratios of MPc/rGO and rGO had no obvious difference, which indicates that the conjugation of rGO was not destroyed and further confirm the noncovalent adsorption. Moreover, a new peak appears at 1620 cm−1 in CuPc/rGO hybrids, similarly, the NiPc/rGO and PbPc/rGO hybrids also appear new peaks, which are located at 1616 and 1607 cm−1, respectively. The new peaks which appeared in the Raman spectra of MPc/rGO hybrids are mainly due to the peak shift and peak overlapping between the MPc and RGO in the hybrids. In addition, the Raman shift provides important information about the electron transfer interaction between the MPc molecules and the RGO sheets. The G band of CuPc/rGO hybrids appears at 1584 cm−1, which is downshifted by 4 cm−1 compared to that of rGO (1588 cm−1). Similarly, the G band of NiPc/rGO (1584 cm−1) and PbPc/rGO (1573 cm−1) are downshifted by 4 and 15 cm−1, respectively. The shift of G band is attributed to the increased abundance of charge carriers [22] provided by the MPc molecules on the graphene plane, which eventually raises the Fermi level [23].Fig. 5


Enhanced NH3-Sensitivity of Reduced Graphene Oxide Modified by Tetra-α-Iso-Pentyloxymetallophthalocyanine Derivatives.

Li X, Wang B, Wang X, Zhou X, Chen Z, He C, Yu Z, Wu Y - Nanoscale Res Lett (2015)

Raman spectra of MPc, rGO, CuPc/rGO, NiPc/rGO, and PbPc/rGO hybrids
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4582035&req=5

Fig5: Raman spectra of MPc, rGO, CuPc/rGO, NiPc/rGO, and PbPc/rGO hybrids
Mentions: The noncovalent adsorption and electron transfer interaction can be also confirmed by Raman spectroscopy. The Raman spectra of MPc, rGO, and MPc/rGO hybrids were shown in Fig. 5. For the rGO sample, the D bands and G bands peaks of rGO could be observed in Fig. 5. The G band at 1588 cm−1 is due to the E2g vibrational mode [4] and the D band at 1366 cm−1 is a breathing mode [12] of k-point phonons of A1g symmetry. As to the MPc/rGO hybrids, the D bands and G bands were also clearly observed, but a large decrease in the intensity, and the D/G intensity ratios of MPc/rGO (0.863) were same as the D/G intensity ratios of rGO (0.862). Guldi pointed out that the changes of the intensity ratio about the D band to the G band can explain the covalent modification of graphene [21]. So the D/G intensity ratios of MPc/rGO and rGO had no obvious difference, which indicates that the conjugation of rGO was not destroyed and further confirm the noncovalent adsorption. Moreover, a new peak appears at 1620 cm−1 in CuPc/rGO hybrids, similarly, the NiPc/rGO and PbPc/rGO hybrids also appear new peaks, which are located at 1616 and 1607 cm−1, respectively. The new peaks which appeared in the Raman spectra of MPc/rGO hybrids are mainly due to the peak shift and peak overlapping between the MPc and RGO in the hybrids. In addition, the Raman shift provides important information about the electron transfer interaction between the MPc molecules and the RGO sheets. The G band of CuPc/rGO hybrids appears at 1584 cm−1, which is downshifted by 4 cm−1 compared to that of rGO (1588 cm−1). Similarly, the G band of NiPc/rGO (1584 cm−1) and PbPc/rGO (1573 cm−1) are downshifted by 4 and 15 cm−1, respectively. The shift of G band is attributed to the increased abundance of charge carriers [22] provided by the MPc molecules on the graphene plane, which eventually raises the Fermi level [23].Fig. 5

Bottom Line: Three kinds of novel hybrid materials were prepared by noncovalent functionalized reduced graphene oxide (rGO) with tetra-α-iso-pentyloxyphthalocyanine copper (CuPc), tetra-α-iso-pentyloxyphthalocyanine nickel (NiPc) and tetra-α-iso-pentyloxyphthalocyanine lead (PbPc) and characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), Raman spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and atomic force microscope (AFM).The as-synthesized MPc/rGO hybrids show excellent NH3 gas-sensing performance with high response value and fast recovery time compared with bare rGO.The enhancement of the sensing response is mainly attributed to the synergism of gas adsorption of MPc to NH3 gas and conducting network of rGO with greater electron transfer efficiency.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, China. wangbin@hlju.edu.cn.

ABSTRACT
Three kinds of novel hybrid materials were prepared by noncovalent functionalized reduced graphene oxide (rGO) with tetra-α-iso-pentyloxyphthalocyanine copper (CuPc), tetra-α-iso-pentyloxyphthalocyanine nickel (NiPc) and tetra-α-iso-pentyloxyphthalocyanine lead (PbPc) and characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), Raman spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and atomic force microscope (AFM). The as-synthesized MPc/rGO hybrids show excellent NH3 gas-sensing performance with high response value and fast recovery time compared with bare rGO. The enhancement of the sensing response is mainly attributed to the synergism of gas adsorption of MPc to NH3 gas and conducting network of rGO with greater electron transfer efficiency. Strategies for combining the good properties of rGO and MPc derivatives will open new opportunities for preparing and designing highly efficient rGO chemiresistive gas-sensing hybrid materials for potential applications in gas sensor field.

No MeSH data available.


Related in: MedlinePlus