If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
741949
Gold nanoparticles
5 nm diameter, OD 1, suspension in citrate buffer
Synonym(s):
Au NP, Gold Colloid
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Quality Level
form
nanoparticles
suspension
concentration
~5.5E+13 particles/mL
OD
1
diameter
5 nm
λmax
510-521 nm
PDI
<0.2
storage temp.
2-8°C
SMILES string
[Au]
InChI
1S/Au
InChI key
PCHJSUWPFVWCPO-UHFFFAOYSA-N
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Related Categories
1 of 4
This Item | 742031 | 741957 | 753610 |
|---|---|---|---|
| form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension | form nanoparticles, suspension |
| contains stabilizer (Proprietary Surfactant) | contains Proprietary Surfactant as stabilizer | contains Proprietary Surfactant as stabilizer | contains - |
| concentration ~5.5E+13 particles/mL | concentration ~3.8E+9 particles/mL | concentration ~6.0E+12 particles/mL | concentration ~6.54E+11 particles/mL |
| OD 1 | OD 1 | OD 1 | OD 1 |
| diameter 5 nm | diameter 100 nm | diameter 10 nm | diameter 20 nm |
| λmax 510-520 nm | λmax 565-574 nm | λmax 515-519 nm | λmax 518-522 nm |
General description
Application
This material is highly monodisperse (<12% variability in size and shape), and provides significantly improved surface reactivity. Applications include Surface Enhanced Raman Lables, Sensing/Detection, Biological Targeting, Plasmonics and Electronics.
Legal Information
Storage Class
12 - Non Combustible Liquids
wgk_germany
nwg
flash_point_f
Not applicable
flash_point_c
Not applicable
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How can I determine the shelf life / expiration / retest date of this product?
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Are these gold nanoparticles coated in a different material to stop them sticking together?
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The 5nm Stabilized Gold Nanoparticles are provided in a 0.1 mg/ml citrate solution supplemented with a proprietary stabilizing surfactant to prevent aggregation.
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What is the approximate concentration (in g/L) of this suspension?
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These Gold Nanoparticles are prepared at a concentration of 9.08 × 10⁻⁸ M or 90.8 nM. Based on the molecular weigh of 196.97 g/mol of gold, this equates to 0.0179 ug/mL
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What is the molar concentration of gold nanoparticles?
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These Gold Nanoparticles are prepared at a concentration of 9.08 × 10⁻⁸ M or 90.8 nM. Please refer to the image below for additional parameter:
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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What is extinction coefficient of this gold nano particle?
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The Molar Extinction Coefficient for this product is reported to be 1.10E+07 (M-1cm-1).
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Do I need to wash my gold nanoparticles?
1 answer-
For most applications, our gold nanoparticles can be used without any additional washing steps. If you have a sensitive application that requires additional washing the best way to do so is by either centrifugation or filtration.
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What is the shape of the gold nanoparticles?
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The majority (>95%) of the gold nanoparticles are spherical.
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My gold nanoparticles settle out of solution upon storage. Is this normal?
1 answer-
Settling of gold nanoparticles on the bottom of the storage flask is completely normal and is especially common for larger sized particles, which settles at greater speed. Settling does not affect the performance of the particles. Prior to use, simply swirl the solution to properly disperse your gold nanoparticles and obtain a homogenous solution.
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How does the storage temperature relate to shipping conditions?
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The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment.
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