Patent ID: 11927537
Assignee: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 10:
11. A process for preparing a SERS substrate comprising:
[a] providing a paper-based substrate having a top surface and a bottom surface;
[b] applying reactants comprising a chitosan solution and a metallic precursor solution on the top surface of the substrate of step [a]; and
[c] incubating the substrate of step [b] under saturated humidity at a temperature in the range of 40 to 120° C. for a period in the range of 15 to 60 mins, whereby said incubation results in direct in situ reduction of the metallic precursor by the chitosan to produce metal nanoparticles deposited on the top surface of the substrate,
wherein the process further comprises, prior to step [a], mounting the paper-based substrate on a plexiglass cassette such that the top surface of the paper-based substrate is facing away from the plexiglass cassette.