Biosynthesis of cadmium sulphide quantum dots by using Pleurotus ostreatus (Jacq.) P. Kumm

Figures & data

Table 1. Comparative analysis of CdS QDs synthesized by bacterial, fungal and plant matrices.

Organism	Temperature for biosynthesis, °C	Average QD sizes synthesized in quantity, nm	Maximum luminescence peak, nm	Location of biosynthesis	Crystal structure	Reference
Escherichia coli	RT*	2–3	443	Extracellular	Wurtzite	Borovaya et al. [12]
Pleurotus ostreatus	26	4–5	462	Extracellular	Wurtzite	This work
Linaria maroccana L.	26	5–7	462	Extracellular	Wurtzite	Borovaya et al. [13]

*RT, room temperature.

Figure 1. Colloidal solution containing CdS nanoparticles biosynthesized using (a) the fungal matrix and (b) control sample containing deionized water with CdSO₄ and Na₂S salts. Scale bar = 1 cm.

Figure 2. UV–visible absorption spectrum of CdS nanoparticles.

Figure 3. Luminescence spectrum of CdS nanoparticles. Note: Excitation λ = 340 nm.

Figure 4. Photoluminescence of CdS quantum dots.Note: 400 nm excitation; clear luminescent band corresponding to 472 nm.

Figure 5. HRTEM micrograph of aggregates of CdS nanoparticles. Note: Scale bar = 100 nm.

Figure 6. HRTEM image of CdS nanoparticles. Note: Scale bar = 20 nm.

Figure 7. High-magnification HRTEM image of CdS nanoparticles. Note: Scale bar = 5 nm.

Figure 8. Particle size distribution histogram based on HRTEM images.

Figure 9. Electron diffraction pattern of CdS nanoparticles.

Table 2. Elemental composition of control and experimental (with nanoparticles) samples determined by electron diffraction spectroscopy.

Sample	O (%)	Si (%)	Fe (%)	P (%)	S (%)	K (%)	Cd (%)
Control	46.18	14.07	1.74	4.57		7.71
Experimental	47.02	10.5	0.52	3.62	29.17	8.79	26.66

Borovaya MN, Naumenko AP, Yemets AI, et al. Stability of the CdS quantum dots, synthesized by the bacteria Escherichia coli. Trans Natl Acad Sci Ukraine. 2014;7:145–151.

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Borovaya MN, Naumenko AP, Matvieieva NA, et al. Biosynthesis of luminescent CdS quantum dots using plant hairy root culture. Nanocsale Res Lett. 2014;9:1–7.

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