UV-induced photochemical transformations of citrate-capped silver nanoparticle suspensions

  • Justin M. Gorham
  • Robert I. MacCuspie
  • Kate L. Klein
  • D. Howard Fairbrother
  • R. David Holbrook
Research Paper

Abstract

Due to the increasing use of silver nanoparticles (AgNPs) in consumer products, it is essential to understand how variables, such as light exposure, may change the physical and chemical characteristics of AgNP suspensions. To this end, the effect of 300 nm ultraviolet (UV) light on (20, 40, 60 and 80) nm citrate-capped AgNP suspensions has been investigated. As a consequence of irradiation, the initial yellow hue of the AgNP suspensions is transformed towards a near colorless solution due to the loss of the surface plasmon resonance (SPR) absorbance. The decrease in SPR absorbance followed a first-order decay process for all particle sizes with a rate constant that increased linearly with the AgNP specific surface area and non-linearly with light intensity. The rate of loss of the SPR absorbance decreased with increasing citrate concentration, suggesting a surface-mediated transformation. Absorbance, atomic force microscopy, and dynamic light scattering results all indicated that AgNP photolysis was accompanied by a diameter decrease and occasional aggregation. Furthermore, in situ transmission electron microscopy imaging using a specialized liquid cell also showed a decrease in the particle size and the formation of a core–shell structure in UV-exposed AgNPs. X-ray photoelectron spectroscopy analysis suggested that this shell consisted of oxidized silver. The SPR in UV-exposed AgNP suspensions could be regenerated by addition of a strong reducing agent (NaBH4), supporting the idea that oxidized silver is present after photolysis. Evidence for UV-enhanced dissolution and the production of silver ions was obtained with the Donnan membrane technique. This study reveals that the physico-chemical properties of aqueous AgNP suspensions will change significantly upon exposure to UV light, with implications for environmental health and safety risk assessments.

Keywords

Silver nanoparticles AgNPs Photolysis NanoEHS Nanoparticle transformations Liquid TEM 

Supplementary material

11051_2012_1139_MOESM1_ESM.doc (698 kb)
Supplementary material (doc 698 kb)

References

  1. Ahamed M, Karns M et al (2008) DNA damage response to different surface chemistry of silver nanoparticles in mammalian cells. Toxicol Appl Pharmacol 233(3):404–410CrossRefGoogle Scholar
  2. Akaighe N, MacCuspie RI et al (2011) Humic acid-induced silver nanoparticle formation under environmentally relevant conditions. Environ Sci Technol 45(9):3895–3901CrossRefGoogle Scholar
  3. Benn TM, Westerhoff P (2008) Nanoparticle silver released into water from commercially available sock fabrics. Environ Sci Technol 42:4133–4139CrossRefGoogle Scholar
  4. Björn LO (2008) Principles and nomenclature for the quantification of light. In: Björn LO (ed) Photobiology. Springer, New York, pp 41–49CrossRefGoogle Scholar
  5. Boyd RD, Cuenat A (2011) New analysis procedure for fast and reliable size measurement of nanoparticles from atomic force microscopy images. J Nanopart Res 13(1):105–113CrossRefGoogle Scholar
  6. Braslavsky SE (2007) Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006). Pure Appl Chem 79(3):293–465CrossRefGoogle Scholar
  7. Briggs D, Seah MP (1990) Practical surface analysis. Wiley, ChichesterGoogle Scholar
  8. Cheng Y, Yin L et al (2011) Toxicity reduction of polymer-stabilized silver nanoparticles by sunlight. J Phys Chem C 115(11):4425–4432CrossRefGoogle Scholar
  9. Chinnapongse SL, MacCuspie RI et al (2011) Persistence of singly dispersed silver nanoparticles in natural freshwaters, synthetic seawater, and simulated estuarine waters. Sci Total Environ 409(12):2443–2450CrossRefGoogle Scholar
  10. Choi O, Hu Z (2008) Size dependent and reactive oxygen species related nanosilver toxicity to nitrifying bacteria. Environ Sci Technol 42:4583–4588CrossRefGoogle Scholar
  11. Costanza J, El Badawy AM et al (2011) Comment on “120 years of nanosilver history: implications for policy makers”. Environ Sci Technol 45(17):7591–7592CrossRefGoogle Scholar
  12. Dai Y, He M et al (2011) Femtosecond laser nanostructuring of silver film. Appl Phys A 106(3):567–574CrossRefGoogle Scholar
  13. Demir E, Vales G et al (2010) Genotoxic analysis of silver nanoparticles in Drosophila. Nanotoxicology. doi:10.3109/17435390.2010.529176 Google Scholar
  14. Duan JS, Park K et al (2009) Optical properties of rodlike metallic nanostructures: insight from theory and experiment. J Phys Chem C 113(35):15524–15532CrossRefGoogle Scholar
  15. Geranio L, Heuberger M et al (2009) The behavior of silver nanotextiles during washing. Environ Sci Technol 43(21):8113–8118CrossRefGoogle Scholar
  16. Geronimo CLA, MacCuspie RI (2011) Antibody-mediated self-limiting self-assembly for quantitative analysis of nanoparticle surfaces by atomic force microscopy. Microsc Microanal 17(2):206–214CrossRefGoogle Scholar
  17. Grobelny J, DelRio FW et al (2009) NIST-NCL Joint Assay Protocol PCC-6: size measurements of nanoparticles using atomic force microscopy. NIST, Gaithersburg, MDGoogle Scholar
  18. Hackley VA, Clogston JD (2007) NIST-NCL Joint Assay Protocol PCC-1: measuring the size of nanoparticles in aqueous media using batch-mode dynamic light scattering. NIST, Gaithersburg, MDGoogle Scholar
  19. Hatchard CG, Parker CA (1956) A new sensitive chemical actinometer. 2. Potassium ferrioxalate as a standard chemical actinometer. Proc R Soc Lond Ser A-Math Phys Sci 235(1203):518–536CrossRefGoogle Scholar
  20. Jiang XC, Chen CY et al (2010) Role of citric acid in the formation of silver nanoplates through a synergistic reduction approach. Langmuir 26(6):4400–4408CrossRefGoogle Scholar
  21. Kalis EJJ, Weng LP et al (2006) Measuring free metal ion concentrations in situ in natural waters using the Donnan Membrane Technique. Environ Sci Technol 40(3):955–961CrossRefGoogle Scholar
  22. Kalis EJJ, Weng LP et al (2007) Measuring free metal ion concentrations in multicomponent solutions using the Donnan membrane technique. Anal Chem 79(4):1555–1563CrossRefGoogle Scholar
  23. Kamat PV (2002) Photophysical, photochemical and photocatalytic aspects of metal nanoparticles. J Phys Chem B 106:7729–7744CrossRefGoogle Scholar
  24. Kamat PV, Flumiani M et al (1998) Picosecond dynamics of silver nanoclusters. Photoejection of electrons and fragmentation. J Phys Chem B 102:3123–3128CrossRefGoogle Scholar
  25. Kennedy AJ, Hull MS et al (2010) Fractionating nanosilver: importance for determining toxicity to aquatic test organisms. Environ Sci Technol 44(24):9571–9577CrossRefGoogle Scholar
  26. Kim B, Park C-S et al (2010a) Discovery and characterization of silver sulfide nanoparticles in final sewage sludge products. Environ Sci Technol 44(19):7509–7514CrossRefGoogle Scholar
  27. Kim J, Kim S et al (2010b) Differentiation of the toxicities of silver nanoparticles and silver ions to the Japanese medaka (Oryzias latipes) and the cladoceran Daphnia magna. Nanotoxicology. doi:10.3109/17435390.2010.508137 Google Scholar
  28. Klaine SJ, Alvarez PJJ et al (2008) Nanomaterials in the environment: behavior, fate, bioavailability, and effects. Environ Toxicol Chem 27(9):1825–1851CrossRefGoogle Scholar
  29. Klein KL, Anderson IM et al (2011) Transmission electron microscopy with a liquid flow cell. J Microsc 242(2):117–123CrossRefGoogle Scholar
  30. Klosky S, Woo L (1926) Solubility of silver oxide in mixture of water and alcohol. J Phys Chem 30(9):1179–1180CrossRefGoogle Scholar
  31. Levard Cm, Reinsch BC et al (2011) Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: impact on dissolution rate. Environ Sci Technol 45(12):5260–5266CrossRefGoogle Scholar
  32. Levard C, Hotze EM et al (2012) Environmental transformations of silver nanoparticles: impact on stability and toxicity. Environ Sci Technol 46:6900–6914CrossRefGoogle Scholar
  33. Lide DR (1999) Handbook of chemistry and physics. Chemical Rubber Pub. Co., ClevelandGoogle Scholar
  34. Linnert T, Mulvaney P et al (1991) Photochemistry of colloidal silver particles—the effects of N2O and adsorbed CN. Ber Bunsen Phys Chem 95(7):838–841CrossRefGoogle Scholar
  35. Liu J, Hurt RH (2010) Ion release kinetics and particle persistence in aqueous nano-silver colloids. Environ Sci Technol 44:2169–2175CrossRefGoogle Scholar
  36. Liu J, Sonshine DA et al (2010) Controlled release of biologically active silver from nanosilver surfaces. ACS Nano 4(11):6903–6913CrossRefGoogle Scholar
  37. MacCuspie RI (2011) Colloidal stability of silver nanoparticles in biologically relevant conditions. J Nanopart Res 13(7):2893–2908CrossRefGoogle Scholar
  38. MacCuspie RI, Allen AJ et al (2011a) Dispersion stabilization of silver nanoparticles in synthetic lung fluid studied under in situ conditions. Nanotoxicology 5(2):140–156CrossRefGoogle Scholar
  39. MacCuspie RI, Rogers K et al (2011b) Challenges for physical characterization of silver nanoparticles under pristine and environmentally relevant conditions. J Environ Monit 13(5):1212–1226CrossRefGoogle Scholar
  40. Maynard A (2010) Project on emerging nanotechnologies. Woodrow Wilson International Center for Scholars. http://www.nanotechproject.org/inventories/consumer/analysis_draft/
  41. Molder JF, Stickle WF et al (1992) Handbook of X-ray photoelectron spectroscopy. Perkin-Elmer Corporation, Eden PrairieGoogle Scholar
  42. Nic M, Jirat J et al (2006) IUPAC. Compendium of chemical terminology (the “Gold Book”), 2nd ed. Blackwell Scientific Publications, Oxford. http://goldbook.iupac.org. ISBN 0-9678550-9-8. doi:10.1351/goldbook
  43. Nowack B (2010) Nanosilver revisited downstream. Science 330(6007):1054–1055CrossRefGoogle Scholar
  44. Nowack B, Krug HF et al (2011a) Reply to comments on “120 years of nanosilver history: implications for policy makers”. Environ Sci Technol 45(17):7593–7595CrossRefGoogle Scholar
  45. Nowack B, Krug HF et al (2011b) 120 Years of nanosilver history: implications for policy makers. Environ Sci Technol 45(4):1177–1183CrossRefGoogle Scholar
  46. Pal S, Tak YK et al (2007) Does the antibacterial activity of silver nanoparticles depend on the shape of the nanoparticle? A study of the gram-negative bacterium Escherichia coli. Appl Environ Microbiol 73(6):1712–1720CrossRefGoogle Scholar
  47. Piccapietra F, Sigg L et al (2012) Colloidal stability of carbonate-coated silver nanoparticles in synthetic and natural freshwater. Environ Sci Technol 46(2):818–825CrossRefGoogle Scholar
  48. Popov AK, Brummer J et al (2006) Synthesis of isolated silver nanoparticles and their aggregates manipulated by light. Laser Phys Lett 3(11):546–552CrossRefGoogle Scholar
  49. Pradhan N, Pal A et al (2001) Catalytic reduction of aromatic nitro compounds by coinage metal nanoparticles. Langmuir 17(5):1800–1802CrossRefGoogle Scholar
  50. Rai M, Yadav A et al (2009) Silver nanoparticles as a new generation of antimicrobials. Biotechnol Adv 27(1):76–83CrossRefGoogle Scholar
  51. Ring EA, de Jonge N (2010) Microfluidic system for transmission electron microscopy. Microsc Microanal 16(05):622–629CrossRefGoogle Scholar
  52. Schon G (1973) ESCA studies of Ag, Ag2O and AgO. Acta Chem Scand 27(7):2623–2633CrossRefGoogle Scholar
  53. Stebounova LV, Guio E et al (2011) Silver nanoparticles in simulated biological media: a study of aggregation, sedimentation, and dissolution. J Nanopart Res 13(1):233–244CrossRefGoogle Scholar
  54. Temminghoff EJM, Plette ACC et al (2000) Determination of the chemical speciation of trace metals in aqueous systems by the Wageningen Donnan Membrane Technique. Anal Chim Acta 417(2):149–157CrossRefGoogle Scholar
  55. Thomas S, Nair SK et al (2008) Size-dependent surface plasmon resonance in silver silica nanocomposites. Nanotechnology 19:075710. doi:10.1088/0957-4484/19/7/075710
  56. Tolaymat TM, El Badawy AM et al (2010) An evidence-based environmental perspective of manufactured silver nanoparticle in syntheses and applications: a systematic review and critical appraisal of peer-reviewed scientific papers. Sci Total Environ 408(5):999–1006CrossRefGoogle Scholar
  57. Tsai DH, Cho TJ et al (2011) Hydrodynamic fractionation of finite size gold nanoparticle clusters. J Am Chem Soc 133(23):8884–8887CrossRefGoogle Scholar
  58. Wagner CD (1975) Chemical shifts of Auger lines, and the Auger parameter. Faraday Discuss Chem Soc 60:291CrossRefGoogle Scholar
  59. Wagner CD, Gale LH et al (1979) 2-Dimensional chemical-state plots—standardized data set for use in identifying chemical-states by X-ray photoelectron-spectroscopy. Anal Chem 51(4):466–482CrossRefGoogle Scholar
  60. Weng LP, Van Riemsdijk WH et al (2005) Kinetic aspects of donnan membrane technique for measuring free trace cation concentration. Anal Chem 77(9):2852–2861CrossRefGoogle Scholar
  61. Weng LP, Van Riemsdijk WH et al (2010) Effects of lability of metal complex on free ion measurement using DMT. Environ Sci Technol 44(7):2529–2534CrossRefGoogle Scholar
  62. Wiesner MR, Lowry GV et al (2009) Decreasing uncertainties in assessing environmental exposure, risk and ecological implications of nanomaterials. Environ Sci Technol 43:6458–6462CrossRefGoogle Scholar
  63. Xue C, Métraux GS et al (2008) Mechanistic study of photomediated triangular silver nanoprism growth. J Am Chem Soc 130(26):8337–8344CrossRefGoogle Scholar
  64. Zook JM, Long SE et al (2011a) Measuring silver nanoparticle dissolution in complex biological and environmental matrices using UV–visible absorbance. Anal Bioanal Chem 401(6):1993–2002CrossRefGoogle Scholar
  65. Zook JM, MacCuspie RI et al (2011b) Stable nanoparticle aggregates/agglomerates of different sizes and the effect of their size on hemolytic cytotoxicity. Nanotoxicology 5(4):517–530CrossRefGoogle Scholar
  66. Zook JM, Rastogi V et al (2011c) Measuring agglomerate size distribution and dependence of localized surface plasmon resonance absorbance on gold nanoparticle agglomerate size using analytical ultracentrifugation. ACS Nano 5(10):8070–8079CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. (outside the USA) 2012

Authors and Affiliations

  • Justin M. Gorham
    • 1
  • Robert I. MacCuspie
    • 1
  • Kate L. Klein
    • 1
  • D. Howard Fairbrother
    • 2
  • R. David Holbrook
    • 1
  1. 1.Material Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgUSA
  2. 2.Department of ChemistryJohns Hopkins UniversityBaltimoreUSA

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