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Tip Etching Kit User Manual 

Version 1.2 • 16 December 2014 

 

 

Help Line: 

German Headquarters and Service Centre:                           
Scienta Omicron GmbH 
Limburger Str. 75 
65232 Taunusstein, Germany 
Tel.: +49(0) 61 28 / 987-230 
Fax: +49(0) 61 28 / 987-33-230 
E-Mail: [email protected]

 

M6171

 

 

 

Summary of Contents for Tip Etching Kit

Page 1: ...ersion 1 2 16 December 2014 Help Line German Headquarters and Service Centre Scienta Omicron GmbH Limburger Str 75 65232 Taunusstein Germany Tel 49 0 61 28 987 230 Fax 49 0 61 28 987 33 230 E Mail services scientaomicron com M6171 ...

Page 2: ...only Notice Please read the safety information on pages 8 to 9 before using the instrument Copyright No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purpose without the express written permission of Omicron NanoTechnology GmbH Warranty Omicron acknowledges a warranty period of 12 months from t...

Page 3: ...eet Request a valid Return Material Authorisation RMA available from the OMICRON service department Ship all returned goods to the advised destination OMICRON Returned WEEE Centre DDP INCOTERMS Otherwise OMICRON will not accept any shipment Normal Use The Tip Etching Kit shall always be used with all cabling connected and secured if applicable with all electronics equipment switched on in an indoo...

Page 4: ...ICRON cannot guarantee compliance with CE directives for components in case of Changes to the instrument not explicitly agreed by OMICRON e g modifications add on s or the addition of circuit boards or interfaces to computers supplied by OMICRON The customer is responsible for CE compliance of entire experimental setups according to the relevant CE directives in case of Installation of OMICRON com...

Page 5: ...5 Cut Off Procedures 15 Threshold Cut Off 15 Differential Cut Off 15 6 DC Etching in Solution Threshold Cut off 16 7 DC Etching in Solution Differential Cut off 18 8 DC Etching Lamella 20 9 Trouble Shooting 22 10 Literature 23 Service at Omicron 24 Index 25 List of Figures Figure 1 Control unit front panel schematic diagram 12 Figure 2 Control unit rear panel schematic diagram 14 Figure 3 DC etchi...

Page 6: ...aterials classified 10 Table 2 Advantages and disadvantages of the etching methods 11 Table 3 Tip etching parameters for polycrystalline tungsten tips in solution 17 Table 4 Tip etching parameters for polycrystalline tungsten tips in solution 19 Table 5 Tip etching parameters for polycrystalline tungsten tips in lamella 21 ...

Page 7: ...ing voltage a set of cables an etching mount tripod with height adjustable rod three insets for tip reception a glass beaker a stainless steel electrode cathode for DC etching in solution an Allen key 1 5 mm a pair of tweezers a pair of cutting pliers with hard metal inset tungsten wire 0 38 mm The tip etching device shall always be used with all cabling connected and secured if applicable with al...

Page 8: ... slits holes so as to avoid overheating The Tip Etching Kit may only be handled by authorised personnel Warning Warning Lethal Voltages Adjustments and fault finding measurements may only be carried out by authorised personnel qualified to handle lethal voltages Lethal voltages are present inside the control unit Caution Always All connectors which were originally supplied with fixing screws must ...

Page 9: ...eas with adequate ventilation and away from acids Caution This product is only to be used indoors in laboratories meeting the following requirements altitude up to 2000 m temperatures between 5 C 41 F and 40 C 104 F specifications guaranteed between 20 C 68 F and 25 C 77 F relative humidity less than 80 for temperatures up to 31 C 88 F decreasing linearly to 50 relative humidity at 40 C 104 F poll...

Page 10: ...produced by cutting or breaking Cut wire pieces perpendicular to the wire axis prior to etching Attention Tungsten wire is very hard and may damage your cutting device Annealed tungsten wire can be fractured Do not cut the wire after etching The supplied tungsten wire is as received from the manufacturer You may want to anneal the tungsten wire prior to etching to do so glow under vacuum 1 10 4 is...

Page 11: ...ter since considerable amounts of liquid may otherwise collect in the capillaries of the tip tip holder assembly and spoil your vacuum afterwards This manual introduces two different etching methods for tungsten tips The following table lists the advantages and disadvantages of these methods DC Solution DC Lamella Advantage no supervision required 80 of the tips achieve ideal shape ideal tip shape...

Page 12: ...echnology Version 1 2 4 The Etching Control Unit Front Panel Figure 1 Control unit front panel schematic diagram Push button switch with optical status indicator Green LED is lit during etching DIFF mode or THRESHOLD mode Yellow LED is lit when wire touches the surface in TIP ADJ mode ...

Page 13: ...ary knob for selecting etching with threshold function responds to threshold current tip adjustment for moving the tip into the liquid etching with differential limit stop responds to current change Ten turn potentiometer for pre selecting the automatic switch off sensitivity This input is only active if the mode selector OPERATION is set to Diff Range 0 to 10 units Ten turn potentiometer for sett...

Page 14: ...10 V output for 0 100 mA etching current Resistive output impedance of the tip etching device is 110 This unit is supplied with a 3 pin standard European mains socket for AC input of 85 265 V 10 and 50 or 60 Hz Maximum power input 10 VA The wire insulations of the standard 3 lead mains cable are coloured in accordance with the following code Brown Live Green Yellow Earth Blue Neutral Mains fuse s ...

Page 15: ...ching current is equal or below the threshold the etching voltage is switched off This method is not very accurate as it cannot detect very small current changes It is however rather simple to use and independent of small changes in NaOH concentration wire length etc This method is well suited for DC etching in solution it cannot be used for lamella etching due to the small current changes involve...

Page 16: ...wire and cut or break if annealed off pieces for tunnel tips final length insertion depth 2 mm Connect the electronics to the etching device using the provided cable set Fix a piece of tungsten to a holder and insert this into the reception of the etching mount Tighten the nuts firmly Switch the control unit on and set the desired etching voltage Switch the mode selector to Tip Adjust to move down...

Page 17: ...ater at least 10 times Check the shape of the tip with a microscope for optimum quality the tip should be a symmetric V shape and the apex should not be resolved in an optical microscope at 500 magnification Store tips in a dry environment desiccator or in vacuum Thoroughly clean the tips with distilled water again directly before use otherwise NaOH crystallites may remain on the point Additionall...

Page 18: ... W wire and cut or break if annealed off pieces for tunnel tips final length insertion depth 2 mm Connect the electronics to the etching device using the provided cable set Fix a piece of tungsten to a holder and insert this into the reception of the etching mount Tighten the nuts firmly Switch the control unit on and set the desired etching voltage Switch the mode selector to Tip Adjust to move d...

Page 19: ...ps to ensure a sharp point Remove the tip and dip it into distilled water at least 10 times Check the shape of the tip with a microscope for optimum quality the tip should be a symmetric V shape and the apex should not be resolved in an optical microscope at 500 magnification Store tips in a dry environment desiccator or in vacuum Thoroughly clean the tips with distilled water again directly befor...

Page 20: ... insert the cathode into the etching liquid Use 0 38 mm W wire and cut or break if using annealed wire off pieces for tunnel tips final length insertion depth 5 mm Or use pieces with 2 final length for etching two tips in one go In this case catch the bottom tip in a thick foam e g shaving lather Connect the electronics to the etching device using the provided cable set Switch the control unit on ...

Page 21: ... ceases to flow Remove the tip and dip it into distilled water at least 10 times Check the shape of the tip with a microscope for optimum quality the tip should be a symmetric V shape and the apex should not be resolved in an optical microscope at 500 magnification All vibration of the etching device should be avoided during etching At the end of the etching process the end of the tungsten piece w...

Page 22: ...ation of a second meniscus see figure 6 However tips as shown in situation may still be used for STM imaging W W Figure 6 Meniscus slides down To prevent the formation of a second lower meniscus try one of the following Add NaOH solution to reconstitute situation Adjust the Z position of the tip to reconstitute situation Increase the NaOH concentration in order to accelerate the etching process DC...

Page 23: ...se J Vac Sci Technol A8 438 440 7 Melmed A J 1991 Art and science and other aspects of making sharp tips J Vac Sci Technol B 9 601 8 Méndez J Luna M and Baró 1992 Preparation of STM W tips and chatacterization by FEM TEM and SEM Surface Science 266 294 298 9 Fotino M 1993 Tip sharpening by normal and reverse electro chemical etching Rev Sci Instrum 64 159 167 10 Albrektsen O Salemnik H W M Mørch K...

Page 24: ...shipping any equipment Place the instrument in a polythene bag Reuse the original packaging and transport locks Take out a transport insurance policy For ALL vacuum equipment Include a filled in and signed copy of the Declaration of Decontamination form which can be found at the back of the equipment manual No repair of vacuum equipment without a legally binding signed decontamination declaration ...

Page 25: ...ethal voltages 3 8 limitations 9 literature 23 M materials 10 measurement fault finding 3 measurements fault finding 8 meniscus 22 P problems 22 R recipe 17 19 references 23 requirements 9 ring electrode 16 18 20 rinse 10 S safety information 3 8 sensitivity 13 19 21 service procedure 24 shape of tip 17 19 solution 16 18 20 STM tips 10 T threshold 17 tip carrier tube 10 tip preparation 10 tungsten...

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