Facile Preparation of High-Quantum-Yield Gold Nanoclusters: Application to Probing Mercuric Ions and Biothiols
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1 Facile Preparation of High-Quantum-Yield Gold Nanoclusters: Application to Probing Mercuric Ions and Biothiols Heng-Chia Chang 1, Ying-Feng Chang 2, Nien-Chu Fan 2 and Ja-an Annie Ho 1,2 * 1 Department of Chemistry, National Tsing Hua University, No. 101, Sec. 2, Kua`ng-Fu Road, Hsinchu, Taiwan 2 BioAnalytical Chemistry and Nanobiomedicine Laboratory, Department of Biochemical Science and Technology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan *Corresponding author: Prof. Ja-an Annie Ho, jaho@ntu.edu.tw Supplementary Information Determination of Quantum Yield Fluorescence quantum yield is defined as the numbers of emitted photons per number of absorbed photons. Quantum yields can be characteristically measured by a relative comparison method. s1 Absorption and fluorescence spectra of concentration series of the test sample and a reference sample (with known quantum yield) were acquired before determination of quantum yield. To avoid inner filter effects, the optical density of tested solutions must be below 0.1 at the excitation wavelength. Rhodamine 6G dissolved in ethanol (Q=0.95) was used herein as reference sample. Fluorescent gold nanoclusters (MUA-AuNC607, 754, 814) dispersed in methanol were used. For each sample and concentration, the absorption (optical density) at 330 nm using Varian Cary 300, and the corresponding photoluminescence spectra using Varian Cary Eclipse were recorded. The intensity versus absorption gradients of each sample was linearly fitted. After correction with the refractive index of solvent, the quantum yield of the test sample could be determined with the formula below. The quantum yield of fluorescent gold nanoclusters was determined as ca. 13% in methanol. QY = QYref x ( I/Iref) x (Aref/A) x (η 2 /ηref 2 ) I = integrated luminescence intensity of AuNCs; A = absorption at 330 nm η = the refractive index of the solvent Through comparison with rhodamine 6G (QY = 95%, in EtOH), we determined the QY of the AuNCs (MUA- AuNCs607) to be ca. 13%, a great improvement, by at least 8 orders of magnitude, relative to that of bulk gold (QY = 10 8 %) and approximately 1-2 orders of magnitude higher than the quantum S1
2 yield of Au NCs derived with other synthesis routes. Same comparison protocol was used to evaluate the QY of MUA-AuNCs754 and MUA-AuNCs814, they were determined to be 0.6% and 0.2%, respectively. Table S1 Comparison of the present sensing probe with other AuNPs- and AuNC-based assays AuNPs/ AuNCs Ligands on surface of AuNPs/AuNCs Detection method Masking Agent LOD (nm) Real sample tested? Reference AuNPs single-strand DNA absorption no 100 no s2 AuNPs MPA absorption no 100 no s3 AuNPs MPA/HCys absorption PDCA 25 no s4 AuNPs MPA/AMP/R6G FRET no 50 Yes, urine sample AuNPs peptide absorption no 26 no s6 AuNPs single-strand DNA absorption no 1000 no s7 AuNPs single-strand DNA Silver enhance -ment no 10 Yes, lake s8 AuNPs single-strand DNA SPR PDCA 300 no s9 AuNPs tween 20 absorption NaCl 100 Yes, drinking s10 AuNPs single-strand DNA/ OliGreen FRET no 25 Yes, pond AuNPs oligopeptides absorption no 10 no s12 AuNPs quaternary ammonium groupterminated thiols absorption no 30 Yes, drinking s13 AuNCs MUA Fluorescence PDCA 5 Yes, pond s14 AuNCs BSA Fluorescence no 0.5 no s15 AuNCs BSA Fluorescence no 80 Yes, river, tap and mineral s16 AuNCs Lysozyme type VI Fluorescence no Yes, pond AuNCs MUA Fluorescence PDCA 0.45 Yes, lake s5 s11 s17 This study S2
3 Figure S1. Time evolution of the photoemission spectrum (excitation wavelength: 330 nm) for the reaction process of MUA AuNCs607. S3
4 (A) (B) (C) (D) Figure S2. (A, B) Absorbance spectra of (A) MUA AuNCs754 and (B) MUA AuNCs814 (insets: photographs of MUA AuNCs solution in room light). (C, D) Normalized fluorescence excitation (grey line) and emission (black line) spectra of (C) MUA AuNCs754 and (D) MUA AuNCs814 (insets: photographs of MUA AuNCs solution under a hand-held UV lamp, with excitation at 365 nm). S4
5 Figure S3. Fluorescence emission spectra of MUA AuNCs607 before (black line) and after (grey line) adding excess NaBH4. The fluorescence was excited at 330 nm. S5
6 (A) (B) Figure S4. HRTEM images of (A) MUA AuNCs754 and (B) MUA AuNCs814 (scale bar: 5 nm). S6
7 (A) (B) Figure S5. XPS spectra (Au 4f) of (A) MUA AuNCs754 and (B) MUA AuNCs814. References S1. Lin, A.-J.; Yang, T.-Y; Lee, C.-H; Huang, S.-H.; Sperling, R.A.; Zanella, M.; Li, J.-K.; Shen, J.-L.; Wang, H.-H.; Yeh, H.-I.; Parak, W.J.; Chang, W.H. Synthesis, Characterization, and Bioconjugation of Fluorescent Gold Nanoclusters Toward Biological Labeling Applications. ACS Nano. 2009, 3, S2. Lee, J-S.; Han, M. S.; Mirkin, C. A. Colorimetric Detection of Mercuric Ion (Hg 2+ ) in Aqueous Media Using DNA-functionalized Gold Nanoparticles. Angew. Chem. Int. Ed. 2007, 46, S3. Huang, C-C.; Chang, H-T. Parameters for Selective Colorimetric Sensing of Mercury(II) in Aqueous Solutions Using Mercaptopropionic Acid-modified Gold Nanoparticles. Chem. Commun. 2007, 12, S4. Darbha, G. K.; Singh, A. K.; Rai, U. S. Yu, E.; Yu, H.; Ray, R. C. Selective Detection of Mercury (II) Ion Using Nonlinear Optical Properties of Gold Nanoparticles. J. Am. Chem. Soc. 2008, 130, S5. Yu, C-J.; Tseng, W-L. Colorimetric Detection of Mercury(II) in a High-Salinity Solution Using Gold Nanoparticles Capped with 3-Mercaptopropionate Acid and Adenosine Monophosphate. Langmuir 2008, 24, S6. Slocik, J. M.; Zabinski, Jr, J. S.; Phillips, D. M.; Naik, R. R. Colorimetric Response of Peptidefunctionalized Gold Nanoparticles to Metal Ions. Small 2008, 4, S7. Xue, X.; Wang, F.; Liu, X. One-Step, Room Temperature, Colorimetric Detection of Mercury (Hg 2+ ) Using DNA/Nanoparticle Conjugates. J. Am. Chem. Soc. 2008, 130, S8. Lee, J-S.; Mirkin, C. A. Chip-Based Scanometric Detection of Mercuric Ion Using DNA- Functionalized Gold Nanoparticles. Anal. Chem. 2008, 80, S7
8 S9. Wang, L.; Li, T.; Du, Y.; Chen, C.; Li, B.; Zhou, M.; Dong, S. Au NPs-enhanced Surface Plasmon Resonance for Sensitive Detection of Mercury(II) Ions. Biosens. Bioelectron. 2010, 25, S10. Lin, C-Y.; Yu, C-J.; Lin, Y-H.; Tseng, W-L. Colorimetric Sensing of Silver(I) and Mercury(II) Ions Based on an Assembly of Tween 20-Stabilized Gold Nanoparticles. Anal. Chem. 2010, 82, S11. Liu, C-W.; Huang, C-C.; Chang, H-T. Control over Surface DNA Density on Gold Nanoparticles Allows Selective and Sensitive Detection of Mercury(II). Langmuir 2008, 24, S12. Du, J.; Sun, Y.; Jiang, L.; Cao, X.; Qi, D.; Yin, S.; Ma, J.; Boey, F. Y. C.; Chen, X. Flexible Colorimetric Detection of Mercuric Ion by Simply Mixing Nanoparticles and Oligopeptides. Small 2011, 7, S13. Liu, D.; Qu, W.; Chen, W.; Zhang, W. ; Wang, Z.; Jiang, X. Highly Sensitive, Colorimetric Detection of Mercury(II) in Aqueous Media by Quaternary Ammonium Group-Capped Gold Nanoparticles at Room Temperature. Anal Chem. 2010, 82, S14. Huang, C. C.; Yang, Z.; Lee, K. H.; Chang, H. T. Synthesis of Highly Fluorescent Gold Nanoparticles for Sensing Mercury(II). Angew. Chem. Int. Ed., 2007, 46, S15. Xie, J.; Zheng, Y.; Ying, J. Y. Highly selective and ultrasensitive detection of Hg 2+ Based on Fluorescence Quenching of Au Nanoclusters by Hg 2+ Au + Interactions. Chem. Commun. 2010, 46, S16. Hu, D.; Sheng, Z.; Gong, P.; Zhang, P.; Cai, L. Highly Selective Fluorescent Sensors for Hg 2+ Based on Bovine Serum Albumin-capped Gold Nanoclusters. Analyst 2010, 135, S17. Lin, Y-H.; Tseng, W-L. Ultrasensitive Sensing of Hg 2+ and CH3Hg + Based on the Fluorescence Quenching of Lysozyme Type VI-Stabilized Gold Nanoclusters. Anal. Chem. 2010, 82, S8
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