Synthesis · A highly sensitive AgNPs/Ni3(HHTP)2 SERS substrate for the detection of food additives and pesticide residues

3 structured synthesis routes

Completeness describes how fully the route could be reconstructed from the main article and supporting information.

Complete recipeSource: Main

4 · Experimental section

Metal precursorsPVP-modified AgNPs; preformed Ni3(HHTP)2 film

Linker precursorsHHTP already incorporated in Ni3(HHTP)2

Solvents2 ml dichloromethane; 2.5 ml deionized water; 1 ml n-hexane

AdditivesPVP on AgNPs

Atmospherenot specified

Temperatureroom temperature assembly; 60 C drying

Substrate orientationNi3(HHTP)2 lifted the interfacial AgNP monolayer film

Work-upshaken to form dense metallic-lustre film; Ni3(HHTP)2 used to lift monolayer; dried at 60 C

Activationstored in a vacuum dryer to maintain performance

Show 5 structured reagent records

Role	Reagent	Amount / concentration	Source
Other	PVP-modified AgNPs	0.5 ml	4 · Experimental section
Solvent	dichloromethane	2 ml	4 · Experimental section
Solvent	deionized water	2.5 ml	4 · Experimental section
Solvent	n-hexane	1 ml	4 · Experimental section
Other	Ni3(HHTP)2 film	Not specified	4 · Experimental section

Complete recipeSource: Main

3 · Experimental section

Metal precursors60 mg silver nitrate

Solvents100 ml vigorously boiling water; ethanol for 2 wt% PVP solution

Additives20 ml of 2 wt% PVP ethanol solution

Atmospherenot specified

Temperatureboiling water; room-temperature cooling

Time1 h boiling; 0.5 h PVP stirring

Oxidant / reductant6 ml of 10 wt% sodium citrate as reductant/stabiliser

Work-upcooled to room temperature; centrifuged at 8000 rpm for 10 min; after PVP modification centrifuged again and washed three times

Show 4 structured reagent records

Role	Reagent	Amount / concentration	Source
Metal Source	silver nitrate	60 mg	3 · Experimental section
Reductant	sodium citrate solution	6 ml · 10 wt%	3 · Experimental section
Solvent	water	100 ml	3 · Experimental section
Additive	polyvinylpyrrolidone (PVP) ethanol solution	20 ml · 2 wt%	3 · Experimental section

Complete recipeSource: Main

3 · Experimental section

Metal precursors90 mg nickel acetate

Linker precursors50 mg HHTP

Solvents20 ml deionized water

Atmospheresealed beaker; gas atmosphere not specified

Temperature80 for synthesis; 60 for overnight drying

Time3 for synthesis; overnight drying

Substrate orientationblue-black film formed on solution surface and was lifted with hydrophilic PDMS film and silicon wafer

Work-upcooled to room temperature; hydrophilic PDMS film and silicon wafer used to lift Ni3(HHTP)2

Activationplaced at 60 C overnight

Show 4 structured reagent records

Role	Reagent	Amount / concentration	Source
Metal Source	nickel acetate	90 mg	3 · Experimental section
Linker	2,3,6,7,10,11-triphenylenehexol (HHTP)	50 mg	3 · Experimental section
Solvent	deionized water	20 ml	3 · Experimental section
Other	PDMS main agent and curing agent	mass ratio 10:1	3 · Experimental section