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Caption : fig. s1. general procedure to synthesize zno nanoparticles in glycerol-urea.

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Caption : fig. s2. images of the gels in the preparations at varying glycerol-isopropanol mole ratios: (a) 1:1, (b) 2:1, (3) 10:1.

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Caption : fig. s3. synthesis of the zno needles by bubbling ammonia.

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Caption : fig.s4. average size histograms of zno tem images for different mole ratios of zn<sup>2+</sup>:ho<sup>-</sup>. preparations in the gu solvent.

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Caption : fig.s5. uv-vis spectra of the zno particles obtained (a) in different zn<sup>2+</sup>:ho<sup>-</sup> mole ratios and temperatures, and (b)  at varying glycerol:isopropanol mole proportion.

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Caption : fig.s6. sem images of zno particles synthesized in the pure glycerol solvent

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Caption : fig.s7. tem images of zno particles synthesized in the g:i 10:1 mole ratio.