Platinum (like Gold) is kind of tough to make truly hydrophilic (since the surface is a noble metal there are no hydroxyl groups to liberate like you have on silicon or quartz). Your best bet is to use an Oxygen Plasma or UV Ozone treatment and then immediately wash with nanopure water, blow dry with ultra pure N2, and then use it as fast as possible. I have used this procedure in the past and it works pretty well, alternatively you can use a Piranha Etch (exercise caution as this is dangerous chemistry) and then again water wash, blow dry, and use immediately. I presume you want to put something hydrophilic directly on the Pt surface... if not, you can try making a SAM on the surface that bears a terminal hydrophilic group (i.e. amino, hydroxyl, or carboxylic acid).

Good Luck!

We use surfactants to make PDMS hidrophilic, so maybe sumerging the substrate with surfactants may help...

Platinum (like Gold) is kind of tough to make truly hydrophilic (since the surface is a noble metal there are no hydroxyl groups to liberate like you have on silicon or quartz). Your best bet is to use an Oxygen Plasma or UV Ozone treatment and then immediately wash with nanopure water, blow dry with ultra pure N2, and then use it as fast as possible. I have used this procedure in the past and it works pretty well, alternatively you can use a Piranha Etch (exercise caution as this is dangerous chemistry) and then again water wash, blow dry, and use immediately. I presume you want to put something hydrophilic directly on the Pt surface... if not, you can try making a SAM on the surface that bears a terminal hydrophilic group (i.e. amino, hydroxyl, or carboxylic acid).

Good Luck!

Yes David, I thing there are many amino, hydroxyl, or carboxylic acid terminated Organo-silanes are available. Which will be best & easy option..

While Vishal is right that there are a lot of silane-based molecules out there for making hydrophilic SAMs, unfortunately none of them are going to bind to a Pt surface due to the lack of hydroxyl groups. If a SAM is going to be prepped on Pt, a thiol-terminated molecule is going to be needed. For a great discussion of the chemistry of thiol-based SAMs on Pt, lots of characterization ideas, and for some nice starter recipes see the work of Petrovykh et al. Langmuir, 2006, 22, 2578-2587 (disclaimer, I used to work with Lee Richter, one of the co-authors of this paper.

Yes. That's 1 way, but there are more eficient ways. You can check this kind of information on the book page 373. A. KRUEGER, Carbon Materials and Nanotechnology (Wiley-VCH, Weinheim, Germany, 2010).

An oxidation in air at elevated temperature is feasible, too. In doing so, the temperature must be kept below 500 ° C to prevent decomposition. In the IR -

spectrum a signifi cant increase of the C = O - band at 1778 cm − 1 is observed, while

at the same time the signals of C – H - stretch vibrations at about 2900 cm − 1 decrease.

Ozone is another oxidant available to modify nanodiamond. It can be applied

by introducing it into a suspension or colloidal solution, yet the reaction is rather

slow. The mechanism is presumably similar to that of the ozonization of adamantane

or cyclohexane. Initially, a hydro peroxide is formed that decomposes to give

a keto compound and an alcohol. The formation of the carbonyl group can be

monitored by the increase of the IR - band at ca. 1740 cm − 1 .

will u please suggest GOLD SULPHIDE JOURNALS

The effect of plasma treatment on the surface was study in paper:

Title: Influence of humidity on atmospheric pressure air plasma treatment of aluminium surfaces

Author(s): Prysiazhnyi V.; Zaporojchenko V.; Kersten H.; et al.

Source: APPLIED SURFACE SCIENCE Volume: 258 Issue: 14 Pages: 5467-5471 DOI: 10.1016/j.apsusc.2012.02.040 Published: MAY 1 2012

the effect of plasma on platinum: Electrochemical characteristics of platinum surface treated by RF plasma

Author(s): Yajima, T (Yajima, T)

Source: SURFACE & COATINGS TECHNOLOGY Volume: 112 Issue: 1-3 Pages: 80-84 DOI: 10.1016/S0257-8972(98)00785-3 Published: FEB 1999

Michal thanks for the papers... the plasma treatment of platinum is quite good.