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Pulicaria glutinosa extract: a toolbox to synthesize highly reduced graphene oxide-silver nanocomposites.

Al-Marri AH, Khan M, Khan M, Adil SF, Al-Warthan A, Alkhathlan HZ, Tremel W, Labis JP, Siddiqui MR, Tahir MN - Int J Mol Sci (2015)

Bottom Line: The plant extract functionalizes the surfaces of highly reduced graphene oxide (HRG) which helps in conjugating the Ag NPs to HRG.The preparation of PE-HRG-Ag nanocomposite is monitored by using ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (XRD), and energy dispersive X-ray (EDX).The as-prepared PE-HRG-Ag nanocomposities display excellent surface-enhanced Raman scattering (SERS) activity, and significantly increased the intensities of the Raman signal of graphene.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. okor-999@hotmail.com.

ABSTRACT
A green, one-step approach for the preparation of graphene/Ag nanocomposites (PE-HRG-Ag) via simultaneous reduction of both graphene oxide (GRO) and silver ions using Pulicaria glutinosa plant extract (PE) as reducing agent is reported. The plant extract functionalizes the surfaces of highly reduced graphene oxide (HRG) which helps in conjugating the Ag NPs to HRG. Increasing amounts of Ag precursor enhanced the density of Ag nanoparticles (NPs) on HRG. The preparation of PE-HRG-Ag nanocomposite is monitored by using ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (XRD), and energy dispersive X-ray (EDX). The as-prepared PE-HRG-Ag nanocomposities display excellent surface-enhanced Raman scattering (SERS) activity, and significantly increased the intensities of the Raman signal of graphene.

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(a,b) Overview TEM images of the graphene/silver nanocomposites prepared by using a 50 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-1) and a 100 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-2); (c) High resolution transmission electron microscopic (HRTEM) image of a Ag NP; (d) FFT measured inside red square in Figure 2c, numbers 1–6 represent important reflections which confirms the cubic structure of Ag NP; and (e) Energy dispersive X-ray (EDX) spectrum of the PE-HRG-Ag nanocomposite confirming the presence of Ag and C.
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ijms-16-01131-f002: (a,b) Overview TEM images of the graphene/silver nanocomposites prepared by using a 50 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-1) and a 100 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-2); (c) High resolution transmission electron microscopic (HRTEM) image of a Ag NP; (d) FFT measured inside red square in Figure 2c, numbers 1–6 represent important reflections which confirms the cubic structure of Ag NP; and (e) Energy dispersive X-ray (EDX) spectrum of the PE-HRG-Ag nanocomposite confirming the presence of Ag and C.

Mentions: The morphology and structure of PE-HRG-Ag-1 and 2 were analyzed via transmission electron microscopy TEM. Figure 2a,b show TEM images of the as-prepared PE-HRG-Ag-1 and PE-HRG-Ag-2 nanocomposites, with the weight ratio between PE-HRG and Ag NPs of 50 wt % and 100 wt % respectively. In the background, (Figure 2a), TEM images revealed a transparent and sheet like structure for PE-HRG. A large number of wrinkles and scrolls were observed on the surface of the PE-HRG sheet, which remained stable under the high energy electron beam.


Pulicaria glutinosa extract: a toolbox to synthesize highly reduced graphene oxide-silver nanocomposites.

Al-Marri AH, Khan M, Khan M, Adil SF, Al-Warthan A, Alkhathlan HZ, Tremel W, Labis JP, Siddiqui MR, Tahir MN - Int J Mol Sci (2015)

(a,b) Overview TEM images of the graphene/silver nanocomposites prepared by using a 50 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-1) and a 100 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-2); (c) High resolution transmission electron microscopic (HRTEM) image of a Ag NP; (d) FFT measured inside red square in Figure 2c, numbers 1–6 represent important reflections which confirms the cubic structure of Ag NP; and (e) Energy dispersive X-ray (EDX) spectrum of the PE-HRG-Ag nanocomposite confirming the presence of Ag and C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4307294&req=5

ijms-16-01131-f002: (a,b) Overview TEM images of the graphene/silver nanocomposites prepared by using a 50 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-1) and a 100 wt %, 0.5 mmol solution of AgNO3 (PE-HRG-Ag-2); (c) High resolution transmission electron microscopic (HRTEM) image of a Ag NP; (d) FFT measured inside red square in Figure 2c, numbers 1–6 represent important reflections which confirms the cubic structure of Ag NP; and (e) Energy dispersive X-ray (EDX) spectrum of the PE-HRG-Ag nanocomposite confirming the presence of Ag and C.
Mentions: The morphology and structure of PE-HRG-Ag-1 and 2 were analyzed via transmission electron microscopy TEM. Figure 2a,b show TEM images of the as-prepared PE-HRG-Ag-1 and PE-HRG-Ag-2 nanocomposites, with the weight ratio between PE-HRG and Ag NPs of 50 wt % and 100 wt % respectively. In the background, (Figure 2a), TEM images revealed a transparent and sheet like structure for PE-HRG. A large number of wrinkles and scrolls were observed on the surface of the PE-HRG sheet, which remained stable under the high energy electron beam.

Bottom Line: The plant extract functionalizes the surfaces of highly reduced graphene oxide (HRG) which helps in conjugating the Ag NPs to HRG.The preparation of PE-HRG-Ag nanocomposite is monitored by using ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (XRD), and energy dispersive X-ray (EDX).The as-prepared PE-HRG-Ag nanocomposities display excellent surface-enhanced Raman scattering (SERS) activity, and significantly increased the intensities of the Raman signal of graphene.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. okor-999@hotmail.com.

ABSTRACT
A green, one-step approach for the preparation of graphene/Ag nanocomposites (PE-HRG-Ag) via simultaneous reduction of both graphene oxide (GRO) and silver ions using Pulicaria glutinosa plant extract (PE) as reducing agent is reported. The plant extract functionalizes the surfaces of highly reduced graphene oxide (HRG) which helps in conjugating the Ag NPs to HRG. Increasing amounts of Ag precursor enhanced the density of Ag nanoparticles (NPs) on HRG. The preparation of PE-HRG-Ag nanocomposite is monitored by using ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (XRD), and energy dispersive X-ray (EDX). The as-prepared PE-HRG-Ag nanocomposities display excellent surface-enhanced Raman scattering (SERS) activity, and significantly increased the intensities of the Raman signal of graphene.

Show MeSH
Related in: MedlinePlus