Supporting Information. Synthesis of Silicon Nanoparticles from Rice Husk and their Use as Sustainable Fluorophores for White Light Emission
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1 Supporting Information Synthesis of Silicon Nanoparticles from Rice Husk and their Use as Sustainable Fluorophores for White Light Emission Sandeep Bose, Mohd. Azhardin Ganayee, Biswajit Mondal, Avijit Baidya, Sudhakar Chennu, Jyoti Sarita Mohanty, Thalappil Pradeep* DST Unit of Nanoscience (DST UNS), and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai , India * pradeep@iitm.ac.in Index Instrumental details Figure S1 TEM image of the rice husk synthesized SiNPs in presence and absence of microwave Figure S2 Absorption features of SiNPs, anthocyanin, SiNPs + anthocyanin Figure S3 TEM images of the anthocyanin and SiNPs after separation using molecular mass cut-off tubes Figure S4 EDAX and elemental mapping of rice husk to show the silica nature Figure S5 Excitation wavelength dependent emission spectra of SiNPs Figure S6 Full range XPS spectrum along with O1s, C1s, N1s spectra of SiNPs Figure S7 XPS spectra of rice husk sample Figure S8 Absorbance against normalized PL intensity plot for slope calculation and quantum yield determination Figure S9 TEM images showing the unaltered SiNPs on changing ph Figure S10 PL intensity plot as a function of time to show photostabilty of SiNPs Figure S11 Time dependent white light emission and its unchanged Page S2 Page S3 Page S4 Page S5 Page S6 Page S7 Page S8 Page S9 Page S10 Page S11 Page S12 Page S13 S1
2 intensity as a function of time Figure S12 Temperature dependent intensity of white light to show thermal stability Figure S13 Hydrophilic nature of SiNPs Figure S14 Solid state white light emission of the material. Page S14 Page S14 Page S15 Figure S15 Time dependent and ph dependent PL spectra of the Si NPs Page S16 Instrumentation Si NPs were characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (PXRD), photoluminescence (PL), UV-Vis absorption and X-ray photoelectron spectroscopy (XPS). UV-Vis absorption spectra were measured using a Perkin Elmer Lambda 25 spectrophotometer in the range of nm. Photoluminescence measurements were performed using a Horiba JobinYvon Nanolog (FL 1000) fluorimeter. The band pass for excitation and emission was set at 3 nm. The excitation wavelength was set at 420 nm. Powder XRD was measured using Bruker D8 Advance diffractometer. The peaks at angles 28, 42 and 56 degrees correspond to (111), (220) and (311) planes of silicon nanoparticles. All the TEM/HRTEM and EDS measurements were done using JEOL 3010 (JEOL Japan) operating at 200 kv. SEM measurements were performed using FEI Quanta 200 operating at 30 kv equipped with EDS. XPS measurements were carried out using Omicron ESCA probe spectrometer with polychromatic Mg Kα X-rays (hυ = ev). The photostability studies were performed with a Philips TL 6W UV lamp. DLS measurements were carried out using Malvern Zetasizer Nano (ZSP) (Temperature, 25 o C; scan, 100; dispersant, water; refractive index, 1.33; viscocity, cp; dielectric constant, 78.5). A Jasco FT/IR-4100 type A spectrometer was utilized for recording the FTIR spectra (Scan, 64; resolution 4 cm -1 ). All the S2
3 photographic images were taken with Nikon D5100 DSLR camera. Luminous flux measurements were carried out using Kusam Meco KM-Lux-99 digital Luxmeter. Figure S1. (A) & (B) TEM images of the SiNPs derived from the microwave treatment of rice husk powder & NaOH mixture. (C) & (D) TEM image of the rice husk powder and NaOH mixture showing the absence of nanoparticles without microwave treatment. S3
4 Figure S2. Absorption features of anthocyanin + SiNPs (cyan) at ph 7. Absorption features anthocyanin (pink) separated from Si NPs (orange) using molecular mass cut off centrifuge tubes shows absorption peak around 600 nm which is characteristic of anthocyanin and is absent in SiNPs. S4
5 Figure S3. (A) & (B) shows the TEM image of the supernatant separated from the Si NPs using molecular mass cut off tubes which may contain silica and anthocyanin but no crystalline Si NPs. Similarly (C) & (D) shows the TEM images of the SiNPs separated. The Si NPs were collected as residue where as anthocyanin was collected as supernatant. This method of separation SiNPs from anthocyanin was quite efficient. S5
6 Figure S4. (A) SEM-EDAX spectrum of rice husk powder. (B) Elemental mapping of rice husk powder to show the elements present in it. It is clearly evident that rice husk contains high quantity of silicon in the form of silica. The carbon and oxygen are coming from the cellulose/hemicellulose and silica present in rice husk. S6
7 Intensity(a.u.) 1.2x x x x10 5 λ 270 nm λ 350 nm λ 420 nm Wavelength (nm) Figure S5. Excitation wavelength dependent emission spectra of Si NPs shows no shift in emission on changing the excitation wavelength. S7
8 Figure S6. (A) Full range XPS spectrum of the Si NPs. (B), (C), (D) shows the C 1s, O 1s, N 1s spectra of microwave synthesized Si NPs respectively. S8
9 Si(IV) Intensity Si(I) Binding energy (ev) Figure S7. XPS spectrum of (rice husk powder + NaOH) mixture. It shows the absence of Si(0) features and only Si(IV) features are present. The Si(0) features at 99.6 ev appears only after microwave irradiation. S9
10 Figure S8. Plot of normalized PL intensity against absorbance to calculate slope (K) of the graph. The quantum yield was calculated to be S10
11 Figure S9. (A) & (B) are TEM images of Si NPs at ph 5 & 11 ensuring the existence of Si NPs i.e. the stability of nanopaticles do not change on changing ph. S11
12 Intensity(a.u.) 5x10 5 CdTe FITC SiNPs 4x10 5 3x10 5 2x10 5 1x Time (hour) Figure S10. Plot of PL intensities of CdTe, FITC, Si NPs as a function of time. S12
13 Figure S11. (A) Plot of the resulting white light emission of the mixture as a function of wavelength at different time interval to check the stability of material. As white light is a mixture of 3 colours i.e. blue, green & red, white light PL show three different regions namely blue emitting region, green emitting region, red emitting region. Figure (B) is a plot of intensity variations of different regions of white light over a period of 45 days. S13
14 Figure S12. (A) Plot of resulting white emission of the material as a function of wavelength at different temperatures of the solution to check the thermal stability of the material. (B) Plot of PL intensities of different regions i.e. blue, green & red regions of white light as a function of temperature.almost no change in intensities were observed indicating thermal stability of the material over the measured range of temperature. Figure S13.(A) & (B) shows the excellent hydrophilic nature of the as-prepared Si NPs where organic solvents having different densities i.e. DCM and Hexane were used to check its miscibility with water dispersible Si NPs. S14
15 Figure S14. Photographic image of the normal perti dish and petri dish coated with material under UV light. S15
16 Figure S15. (A) Time dependent photoluminescence spectra of the green luminescent Si NPs. (B) ph dependent photoluminescence spectra of the Si NPs. S16
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